Kootenay River White Sturgeon Studies in British Columbia ...a100.gov.bc.ca/appsdata/acat/documents/r176/... · Kootenay River White Sturgeon Studies – 2001 i Abstract Juvenile

Kootenay River White Sturgeon

Studies in British Columbia, 2001

Matthew D. Neufeld

and

Colin R. Spence

Ministry of Water, Land and Air Protection 401 – 333 Victoria Street

Nelson, BC V1L 4K3

June 2002

This project was funded by the Bonneville Power Administration (Columbia Basin Fish and Wildlife Authority), in co-operation with the Idaho Department

of Fish and Game, and the Kootenai Tribe of Idaho.

Kootenay River White Sturgeon Studies – 2001 i

Abstract

Juvenile white sturgeon (Acipenser transmontanus) were sampled in the Kootenay River between the Canada – U.S. border and the Creston Delta at the south end of Kootenay Lake between June 19 and September 7, 2001. Sampling efforts resulted in a total of 98 sturgeon captures. Gill nets were the primary sampling gear, resulting in 387.9 net-hours of effort and capture of 97 juvenile sturgeon. Angling and cod traps were used to a lesser extent, resulting in 40 rod-hours and 10.2 trap-days of effort respectively. One juvenile sturgeon was captured through angling efforts and none were captured in cod traps. As in previous years, gill net sampling was the most effective capture method. Catch rates varied by location, time period, and depth; however, no sturgeon were captured in the East Channel or Corn Creek Slough. Sturgeon catch rates were low on the Creston Delta but increased as sampling progressed upstream towards the Canada/U.S. border. Catch rates increased steadily from June 19 through to the end of the study period on September 7, as in previous studies. The minimum and maximum set depths of nets that captured sturgeon were significantly deeper than the minimum and maximum depths of all net sets. Comparisons of the depth frequency distribution of sturgeon capture and all sets also showed significant differences; juvenile sturgeon were captured more frequently in deeper habitats. Sturgeon fork lengths ranged from 190 to 705 mm (mean 298 mm) while weights ranged from 45 to 2230 g (mean 195g). The relative weight (Wr) of juveniles ranged from 64 to 166% (mean 83%). Temperature recorders were deployed in five locations in the study area to examine trends related to catch rate and temperature, and to identify the suitability of backchannel habitats for juvenile sturgeon rearing. Although no relationship between catch rate and temperature was identified, the temperatures recorded in all the backchannel habitats were suitable, and in some cases very favourable, for juvenile sturgeon rearing.

Kootenay River White Sturgeon Studies – 2001 ii

Kootenay River White Sturgeon Studies – 2001 iii

Table of Contents

Abstract ........................................................................................................................................... i

Table of Contents..........................................................................................................................iii

List of Tables .................................................................................................................................. v

List of Figures ............................................................................................................................... vi

List of Appendices........................................................................................................................vii

1.0 Introduction.............................................................................................................................. 1

2.0 Study Area................................................................................................................................ 3

3.0 Methods .................................................................................................................................... 3

3.1 Sampling Stratification......................................................................................................... 3 3.1.1 Spatial Stratification....................................................................................................... 3 3.1.2 Temporal Stratification .................................................................................................. 4 3.1.3 Depth Stratification ........................................................................................................ 4

3.2 Fish Capture......................................................................................................................... 4 3.2.1 Gill Nets ........................................................................................................................ 4 3.2.2 Cod Traps..................................................................................................................... 6 3.2.3 Angling.......................................................................................................................... 6 3.2.4 Capture Data ................................................................................................................. 6

3.3 Sonic Tagging....................................................................................................................... 7

3.4 Temperature Recorders ........................................................................................................ 8

4.0 Results...................................................................................................................................... 9

4.1 Fish Capture.......................................................................................................................... 9 4.1.1 Gill Nets ........................................................................................................................ 9

4.1.1.1 By-Catch ................................................................................................................ 9 4.1.1.2 Sturgeon Capture Locations................................................................................... 9 4.1.1.3 Sturgeon Capture Dates ......................................................................................... 9 4.1.1.4 Sturgeon Capture Depth....................................................................................... 13 4.1.1.5 Gill Net Selectivity .............................................................................................. 17 4.1.1.6 Crawford Bay Sampling ...................................................................................... 18

4.1.2 Cod Traps.................................................................................................................... 18 4.1.3 Angling........................................................................................................................ 18 4.1.4 Life History ................................................................................................................. 20

4.2 Recapture Information......................................................................................................... 21

4.3 Sonic Tagging..................................................................................................................... 22

4.4 Temperature Recorders ...................................................................................................... 26

Kootenay River White Sturgeon Studies - 2001 iv

5.0 Discussion ............................................................................................................................. 29

5.1 Gear Efficiency................................................................................................................... 29

5.2 Life History......................................................................................................................... 30

5.3 Movements......................................................................................................................... 32

5.4 Water Temperature............................................................................................................ 32

Recommendations........................................................................................................................ 35

Acknowledgements ...................................................................................................................... 37

Literature Cited ........................................................................................................................... 39

Appendices.................................................................................................................................... 43

Kootenay River White Sturgeon Studies - 2001 v

List of Tables Table 1. Summary of catch and catch-rate (CPUE=number juveniles caught/net-hour) of white

sturgeon captured, by sample location, in Kootenay River and Lake. .......................... 10 Table 2. Summary of catch and catch-rate (CPUE=no. juveniles caught/net hour) of white

sturgeon captured, by time period, in Kootenay River and Lake. ................................. 10 Table 3. Gill netting effort (net-hours) by time strata and location .............................................. 10 Table 4. Summary of catch and catch-rate (CPUE= no. juveniles caught/net hour) of juvenile

white sturgeon captured, stratified by set depth, in Kootenay River and Lake. ............ 13 Table 5. Summary of minimum and maximum set depths of sets that captured sturgeon and all

sets. Includes comparisons for all sets, and for sets excluding R-2 and S-1. ............... 14 Table 6. Summary of catch and catch-rate (CPUE= no. juveniles caught/net hour) of juvenile

white sturgeon captured, stratified by mesh size, in Kootenay River and Lake............ 17 Table 7. Summary of the number of sets that captured sturgeon and all sets, stratified by mesh

size................................................................................................................................. 17 Table 8. Summary of data from sturgeon captured by angling..................................................... 18 Table 9. Growth rates for juvenile sturgeon recaptured in 2001. ................................................. 22 Table 10. Summary of life history information from the three radio tagged juvenile sturgeon. .. 22 Table 11. Location and depth, as well as deploy and recovery dates of temperature recorders. .. 26

Kootenay River White Sturgeon Studies - 2001 vi

List of Figures

Figure 1. Location of juvenile white sturgeon studies on the Kootenay River and Kootenay Lake.

......................................................................................................................................... 2 Figure 2. Kootenay Lake and the Kootenay River near Creston, B.C., showing river kilometer

markers as well as stratification boundaries and identification symbols......................... 5 Figure 3. Juvenile sturgeon equipped with an external mount sonic tag on the Kootenay River

delta, August 16, 2001..................................................................................................... 7 Figure 4. Juvenile sturgeon capture locations in Time Strata 1 (a; June 17 - July 14), 2 (b; July

15 - August 10), and 3 (c; August 11 – September 8), as well as the location of all net sets (d). .......................................................................................................................... 12

Figure 5. Location of gill net sets which captured sturgeon. ........................................................ 11 Figure 6. Proportion of net sets at different minimum set depths for all sets vs. sets that captured

sturgeon (a), and all sets vs. sets that captured sturgeon, excluding sets from R-2 (East Channel) and S-1 (Corn Creek Slough) (b)................................................................... 15

Figure 7. Proportion of net sets at different maximum set depths for all sets vs. sets that captured

sturgeon (a), and all sets vs. sets that captured sturgeon, excluding sets from R-2 (East Channel) and S-1 (Corn Creek Slough) (b)................................................................... 16

Figure 8. Cod trap set locations. ................................................................................................... 19 Figure 9. Length frequency histogram for juvenile sturgeon captured in 2001............................ 20 Figure 10. Tracking locations of a juvenile sturgeon, sonic tag code 8-2-8, on the Kootenay

River. ............................................................................................................................. 23 Figure 11. Tracking locations of a juvenile sturgeon, sonic tag code 8-3-2, on the Kootenay

River. ............................................................................................................................. 24 Figure 12. Tracking locations of a juvenile sturgeon, sonic tag code 8-3-7, on the Kootenay

River. ............................................................................................................................. 25 Figure 13. Location of temperature recorders deployed in 2001.................................................. 27 Figure 14. Water temperatures for the Kootenay River and nearby slough habitats, July 24

through September 24, 2001.......................................................................................... 28 Figure 15. Water temperatures for Kootenay Lake at the Creston Delta, July 26 through

September 24, 2001. ...................................................................................................... 28

Kootenay River White Sturgeon Studies - 2001 vii

List of Appendices Appendix A. Summary of gill net set data, 2001.......................................................................... 43 Appendix B. Capture information from juvenile sturgeon captured in 2001. ............................. 53 Appendix C. Summary of sturgeon recapture and life history information.................................. 56 Appendix D. Summary of adult sturgeon capture data................................................................. 59 Appendix E. Summary of incidental gill net catch, 2001. ............................................................ 60 Appendix F. Cod trap set records, 2001. ...................................................................................... 64 Appendix G. Cod trap catch records, 2001................................................................................... 64 Appendix H. Gill net set data from sampling in Crawford Bay, 2001. ........................................ 65 Appendix I. Gill net catch records from net sampling in Crawford Bay, 2001. ........................... 65 Appendix J. Locations of juvenile sturgeon equipped with sonic tags in the summer of 2001.... 66

Kootenay River White Sturgeon Studies - 2001 1

1.0 Introduction White sturgeon (Acipenser transmontanus) occur along the Pacific coast of North America from central California to the Aleutian Islands. In south-eastern British Columbia, the range of this species extends into Kootenay Lake and the Kootenay River (spelled Kootenai in the U.S.), located in the upper Columbia River basin. The Kootenay population is distinct from other Columbia River sturgeon (Anders et al. 2000), having been isolated by Bonnington Falls since the last glaciation (Northcote 1973). The range of this population is now further restricted by several dams, which have also altered river and lake environments. The Kootenay population is now distributed from Kootenai Falls, Montana, downstream through Kootenay Lake to Corra Linn Dam on the lower West Arm of Kootenay Lake, B.C. (Figure 1). The Kootenay River white sturgeon population began to experience recruitment failure during the mid-1960’s (Partridge 1983). Libby Dam, located on the Kootenai River system upstream of Kootenai Falls in Montana, began operations in 1972 and has been linked to recent, more extensive problems with recruitment (U.S. Fish and Wildlife Service 1999). The population has now been listed under the U.S. Endangered Species Act, as well as by B.C.’s Conservation Data Center (Red Listed – critically imperilled). A Recovery Plan has recently been implemented, providing direction for ongoing studies, modifications to Libby Dam operations and conservation aquaculture operations (U.S. Fish and Wildlife Service 1999). Concern for Kootenay white sturgeon has prompted initiation of detailed studies in both Idaho and British Columbia. Co-operative investigations by the Idaho Department of Fish and Game and the B.C. Ministry of Water, Land, and Air Protection (MWLAP) began in 1994 with funding from the Bonneville Power Administration (Columbia Basin Fish and Wildlife Authority). Juvenile white sturgeon sampling has been completed annually since 1998 in the Kootenay River between the Canada – U.S. border and the Creston Delta at the south end of Kootenay Lake. Although adult sturgeon in Kootenay system have been studied extensively (e.g. RL&L 1999, Paragamian et al. 1999), the life history of juvenile sturgeon is less well understood. Recent studies on the Kootenay River (Paragamian et al. 1999, Vandenbos and Spence 2001, Young and Scarnecchia 1999) have identified gill nets and ultrasonic telemetry as particularly useful in describing behaviour and habitat use patterns. Also, on the Columbia River, gill nets are now frequently used in place of bottom trawls to sample juvenile sturgeon (Kerr et al. 2001).


Figure 1. Location of juvenile white sturgeon studies on the Kootenay River and Kootenay Lake.


Studies completed in 2001 were a continuation of the aforementioned projects, and were aimed at assessing progress in the recovery of Kootenay white sturgeon within B.C. Specifically, our objectives were to: • describe trends related to growth, distribution, survival and abundance of juvenile

white sturgeon; • determine large scale habitat preferences of wild and hatchery produced juveniles; • determine the age distribution of wild and hatchery produced juveniles; • experiment with small mesh gill nets to determine if larval sturgeon released in 2000

had survived; • further test the capture efficiency of cod traps for juvenile sturgeon sampling; and • determine if the temperature regime in various slough habitats along the lower

Kootenay River were suitable for juvenile sturgeon rearing. 2.0 Study Area The Canadian portion of the Kootenay white sturgeon range is located in south-eastern British Columbia, immediately north of the state of Idaho (Figure 1). The Kootenay River enters Kootenay Lake at its southern tip. The lake is also fed by the Lardeau and Duncan rivers at the north end, and numerous other much smaller tributaries. The outlet of Kootenay Lake flows from the lake’s mid-point for approximately 70 km in a westerly direction, eventually descending over a series of dams and entering the Columbia River near Castlegar. These dams, as well as a dam on Lardeau/Duncan system, currently restrict distribution of white sturgeon in Kootenay system within B.C.. A more detailed description of Kootenay Lake can be found in Daley et al. (1981). The present study was conducted in a small portion of the present range of Kootenay white sturgeon, and included 50 km of Kootenay River from the Canada - U.S. border, downstream to, and including the entrance to Kootenay Lake (Figure 2). The area where the river enters Kootenay Lake is referred to as the Creston Delta. 3.0 Methods 3.1 Sampling Stratification The Kootenay River between the Canada – U.S. border and the Creston Delta were divided into spatial, temporal, and depth strata for sampling purposes. We attempted to distribute fishing effort uniformly between the various strata, to ensure each was afforded sufficient attention that trends might be identified.

3.1.1 Spatial Stratification The sampling area was divided into nine spatial strata (Figure 2). The Kootenay River (river km 120.5-170.0) was divided into six strata, each of which was approximately 10 km in length (R-1 to R-6). The Creston Delta at the south end of Kootenay Lake was


divided into two strata (DW and DE). Also, the Corn Creek slough near the Creston boat launch (river km 150), which included a network of channels that ran west of the Kootenay River along the valley bottom, were grouped into one stratum (S-1).

3.1.2 Temporal Stratification The sampling period (June 17 – September 8) was divided into three separate time periods of approximately four weeks in length. The three strata were defined as June 17 - July 14, July 15 - August 10, and August 11 – September 8.

3.1.3 Depth Stratification Depth of captures in the Kootenay River and Creston Delta were divided into two strata. Capture depths in the river and delta were stratified by maximum set depths of <15m in the shallow strata and minimum set depths of >15m in the deep strata. The depth of stratum division was based on an examination of habitat availability and catch records from previous years, where we determined that most of the deeper pool habitats were at least 15 m in depth, where glides were typically less (Vandenbos and Spence 2001). Due to differences in habitat types, the East Channel of the Kootenay River (R-2) and Corn Creek slough were not stratified by depth. The maximum depths in Corn Creek Slough (river km 150) and the East Channel do not exceed 15m, and therefore sets in these areas were all grouped into the shallow depth stratum. 3.2 Fish Capture Juvenile sampling was conducted from a 7.0 m boat. Locations were determined by GPS (Trimble Geoexplorer II). Set and pull times were recorded for each set. Maximum and minimum set depths were recorded for all net sets and set depth was recorded for cod trap sets using a Lowrance (model LMS-350a) depth sounder. Set areas were occasionally limited by bottom conditions; nets were not set in areas with high concentrations of woody debris because of potential problems with lost or damaged gear.

3.2.1 Gill Nets Juvenile white sturgeon were captured using multi-strand nylon gill nets of 45 m long by 1.8 m high. Nets consisted primarily of 5cm stretch measure mesh, which has proven the most effective size for capturing juvenile young-of-the-year (YOY) white sturgeon in previous work on the Columbia River (Burner et al. draft 1999) and is also the size of mesh that has been used on the Kootenay River during previous years of juvenile sampling (Vandenbos and Spence 2001). Smaller mesh nets (2.5 cm stretch measure) were used on a trial basis in approximately one quarter of net sets to identify smaller white sturgeon resulting from a larval sturgeon release into the Kootenay River in the summer of 2000. The target length of sets was intended to be 1 hour in duration; however, some sets were as long as 1.75 hours due to the time involved in examining captured juvenile sturgeon.


R-2

R-1

R-3

R-4

R-5

R-6

S-1

W-D

E-D

Stratum BoundaryR-3 Stratum ID

Figure 2. Kootenay Lake and the Kootenay River near Creston, B.C., showing river kilometer

markers as well as stratification boundaries and identification symbols.


3.2.2 Cod Traps Cod traps were used in a small number of sets on a trial basis. The traps were based on a design used by the marine commercial fishing industry to catch black cod (Anaplopoma fimbria) on the Pacific coast and are described more fully by Spence (1999). All traps were baited with kokanee (Oncorhynchus nerka) spawner carcasses. Cod traps have been used in previous years to capture juvenile sturgeon with limited success (e.g. Spence 2000). However, with the expectation of a much larger juvenile sturgeon population in 2001 than in previous years, we again tested the utility of cod traps.

3.2.3 Angling Angling was undertaken on a casual basis, between sets, while gill net sampling. Size 6 and 8 hooks were used on a still-fished bottom rig, lighter in weight but otherwise similar to that commonly used for adult sturgeon. Bait used included small pieces of kokanee spawner carcasses and earthworms. A formal record of angling hours was not maintained. However an estimate of angling effort and catch was developed based on consultation with the field crew.

3.2.4 Capture Data All captured white sturgeon were brought into the boat for sampling. Smaller juveniles were placed in a plastic container filled with water. Larger juveniles and all adults were placed in a waterproof stretcher, with enough water to allow for respiration. Fresh water was frequently added to the stretcher during the processing period. After processing, sturgeon were returned to the water and released once normal respiration, orientation and swimming behaviour were established. All white sturgeon were first examined for previous marks. Previous marks included Passive Integrated Transponder (PIT) tags (placed either on the right side just ventral to the dorsal fin, or near the head), scute removal (left and/or right side, counted from the anterior end), and/or evidence of previous fin clips on either the right or left pectoral fin. Recaptured sturgeon with the second scute removed on the left side (2L) were previously marked on the Kootenay system while sampling, while hatchery produced fish had scutes removed on both sides indicating the year of hatch (e.g., 9L 5R = 1995 brood). All sturgeon were measured for fork length (FL) and total length (TL) to the nearest millimetre. Weight was determined for all fish using a spring scale with the appropriate capacity. Newly captured adults were marked with the application of a PIT tag on the right side below the dorsal fin, and with removal of the 2L scute. Hatchery produced juveniles that had a non-responsive or lost PIT tag were marked with the application of a new PIT tag on the right side. One hatchery juvenile with a non responsive or lost PIT tag was released before it was re-tagged. All incidental catches were identified by species, measured for FL (mm), returned to water and released when or if normal swimming behaviour was observed.


3.3 Sonic Tagging Three juvenile sturgeon were fitted with externally attached sonic transmitters (Sonotronics Model IT95-2) which were 14 mm wide by 45 mm long and weighed 5 g in water. Sonic tags were equipped with holes at each end to allow wire to be passed through for attachment purposes. Fine, plastic coated wire was threaded through the holes in the radio tag and a neoprene backing pad. In the case of two sturgeon, two sterilized spinal needles were then passed through the dorsal musculature within five dorsal scutes of the head. One sturgeon was large enough to facilitate the use of a drill to create two holes through two of the dorsal scutes. The wire from each end of the radio tag was then inserted through the spinal needles as a means to pass it through the dorsal musculature. The needles were then removed. For the fish in which the dorsal scutes were drilled, the wire was inserted directly through the freshly drilled openings. The two ends of the wire were then passed through a neoprene pad and a plastic backing plate. The two ends of the wire were drawn tight around the back of the backing plate and secured using wire crimps (Figure 3). Sonic tags, wire, backing plates, drill bit and spinal needles were sterilized in Germiphene™ prior to attachment.

Figure 3. Juvenile sturgeon equipped with an external mount sonic tag on the Kootenay River

delta, August 16, 2001.


3.4 Temperature Recorders Five TidBitTM temperature recorders were deployed in the study area. One recorder was deployed on the Creston Delta on July 26 and in the Kootenay River on July 24. The remaining three recorders were deployed on July 24 in slough or back channel habitats in Leach Lake, Six Mile Slough and Corn Creek Slough. Temperature recorders were attached to a concrete block and placed on the bottom substrate at each sample location. Temperature recorders were calibrated to record temperatures every two hours. Data from all five temperature recorders were recovered on September 24.


4.0 Results 4.1 Fish Capture

4.1.1 Gill Nets In 2001, gill nets were set 340 times between June 19 and September 7. Two of these sets became badly tangled on the bottom substrate and were not used in our calculations. In previous years high river discharge and extreme wave conditions had occasionally limited set locations (Vandenbos and Spence 2001). Set locations were not limited by river and lake conditions in 2001 because of favourable weather and low river levels. The 338 sets that fished effectively accounted for a total effort of 387.9 net-hours and a catch of 96 juvenile sturgeon (Appendices A and B). One juvenile sturgeon was captured twice in 2001, accounting for a total of 97 net captures of young sturgeon.

4.1.1.1 By-Catch A total of 355 fish of species other than sturgeon were captured incidentally during this study, for a by-catch of 0.915 fish per net-hour (Appendix E). Species captured included longnose sucker (Catostomus catostomus), largescale sucker (Catostomus macrocheilus), peamouth (Mylocheilus caurinus), northern pikeminnow (Ptychocheilus oregonensis), kokanee (Oncorhynchus nerka), mountain whitefish (Prosopium williamsoni), pumpkinseed (Lepomis gibbosus), yellow perch (Perca flavescens), black catfish (Ameiurus melas), and redside shiner (Richarsonius balteatus). Peamouth accounted for the highest number of captures (n=113), although whitefish and northern pikeminnow were also captured frequently (n= 92 and 53, respectively).

4.1.1.2 Sturgeon Capture Locations Sampling was performed in all nine spatial strata (Table 1). No sturgeon were captured in the Kootenay River East Channel (R-2), or the Corn Creek Slough (S-1). Catch rates were low on the Creston Delta and in the lowest ten kilometres of Kootenay River (DE, DW, and R-1). Above river kilometre (rkm)130, catch rates increased as the river kilometre increased with the highest catch rates near the Canada/US border (R-7). More effort was expended in R-6 because catch rates were highest in that stratum, and therefore life history information could be gathered with greater efficiency. Because it was unclear if S-1 represented suitable juvenile habitat, less effort was expended in this strata. While sets were placed in all areas of the river, sets that captured fish were generally set in the deep areas associated river bends (Figure 4). Few fish were captured on the shallow, flat bottom glides between river bends.

4.1.1.3 Sturgeon Capture Dates Sampling effort was distributed over all three time strata (Table 2). A minimum of 12 sets were completed in spatial strata during each time period. Catch rates were higher in late August and early September than in June or July.

The spatial distribution of sturgeon captures differed by time strata. However, the expenditure of effort over each time strata was relatively similar by location (Table 3). Therefore, time period differences in the location of captures were not a result of changes


in effort expenditure. Sturgeon captures were limited to the area between river kilometer 160 and 170 (R-6) in time stratum 1 (June17-July 14; Figure 8a). In time stratum 2 (July 15-August 10), juvenile sturgeon were captured in an area between river kilometer 140 and 170 (R-4 to R-6), as well as one juvenile capture between river kilometer 120 and 130 (R-1; Figure 8b). In time stratum 3 (August 11-September 8) juvenile sturgeon were captured between river kilometer 130-170 (R3 to R-6), and in both spatial stratum on the Creston Delta (DE and DW; Figure 5). No juvenile sturgeon were captured in Corn Creek Slough (S-1), between river kilometer 120-130 (R-1) or in the East Channel (R-2) during time stratum 3. Table 1. Summary of catch and catch-rate (CPUE=number juveniles caught/net-hour) of white sturgeon captured, by sample location, in Kootenay River and Lake.

Spatial Sample Net White sturgeon Stratum Location Hours Catch CPUE

(DE) East Delta, Kootenay Lake 41.5 2 0.048 (DW) West Delta, Kootenay Lake 42.1 2 0.048 (R-1) Kootenay River km 120-130 44.2 1 0.023 (R-2) Kootenay River, East Channel 39.9 0 0.000 (R-3) Kootenay River km 130-140 42.5 4 0.094 (R-4) Kootenay River km 140-150 44.8 7 0.156 (R-5) Kootenay River km 150-160 47.7 27 0.566 (R-6) Kootenay River km 160-170 72.1 54 0.749 (S-1) Back Channel and Slough Habitat (Rkm 150) 13.1 0 0.000

Total 387.9 97 0.250

Table 2. Summary of catch and catch-rate (CPUE=no. juveniles caught/net hour) of white sturgeon captured, by time period, in Kootenay River and Lake.

Time Date Net White sturgeon Strata Hours Catch CPUE

1 June 17 - July 14 140.4 20 0.142 2 July 15 - August 10 131.6 34 0.258 3 August 11 - September 8 115.9 43 0.371

1 to 3 June 17 - September 8 387.9 97 0.250 Table 3. Gill netting effort (net-hours) by time strata and location

Time Strata

DE DW S-1 R-1 R-2 R-3 R-4 R-5 R-6

1 13.9 13.6 9.0 12.8 13.3 15.2 19.3 18.5 25.8 2 12.7 13.0 4.1 14.6 13.1 13.1 12.7 16.7 31.8 3 14.8 15.4 0.0 13.8 13.6 14.2 12.8 13.7 14.6


Figure 4. Location of gill net sets in which white sturgeon were captured.


Figure 5. Juvenile sturgeon capture locations in time stratum 1 (a; June 17 - July 14), stratum 2

(b; July 15 - August 10), and stratum 3 (c; August 11 – September 8), as well as the location of all net sets (d).


4.1.1.4 Sturgeon Capture Depth We compared the depths of gill net sets that captured young sturgeon to those that did not. During the analysis, we noted that it was unclear if Corn Creek Slough (S-1) and the East Channel of the Kootenay River (R-2) represented suitable juvenile sturgeon rearing habitat, as no juvenile sturgeon were captured in these areas and all sets in these two areas were less than 15 m. Although studies on juvenile sturgeon in the Fraser River (Lane and Roseneau, 1993) indicated that backchannel areas were consistently used as juvenile rearing habitat, backchannel areas with unidirectional flow and depths of less than 5 m were rarely used. These two areas (R-2 and S-1) both have unidirectional flow and only one small area in the East Channel (R-2) that exceeds 5 m in depth. Because of this uncertainty, comparisons of set depths were completed with and without the sets from these strata. We compared catch rates in the two depth strata based on all sets, higher values occurred in sets 15 m or greater in depth. Net sets that were greater than 15 m in depth accounted for 84% of the catch and only 42% of the effort (Table 4). When we compared sets, excluding sets from R-2 and S-1, catch rates in sets greater than 15 m were still much higher, accounting for 84% of the catch and only 49% of the effort (Table 4). Table 4. Summary of catch and catch-rate (CPUE= no. juveniles caught/net hour) of juvenile white sturgeon captured, stratified by set depth, in Kootenay River and Lake.

All Sets Sets excluding S-1 and R-2Set Depth Sturgeon Captures Effort CPUE Effort CPUE

%(n) %(hr) n/hr %(hr) n/hr Deep (>15 m) 84 (81) 42 (164.2) 0.493 49 (164.2) 0.493 Shallow (<15 m) 16 (16) 58 (223.7) 0.072 51 (170.7) 0.094

Total 100 (97) 100 (387.9) 0.250 100 (334.9) 0.290 We also compared mean minimum and maximum set depths for all sets, including sets from R-2 and S-1. The mean minimum set depth of nets that captured sturgeon was 15.7 m - significantly deeper than the mean minimum set depth of all sets at 10.7 m (Mann-Whitney U=4846.0, P < 0.000; Table 5). The mean maximum set depth of nets that captured sturgeon was again significantly deeper than the mean maximum set depth of all sets (Mann-Whitney U=5279.5, P < 0.000; Table 5). Comparisons of mean set depth, excluding sets from R-2 and S-1, yielded similar results. Mean minimum and maximum set depths for sets that captured sturgeon were again significantly deeper than the means for all sets (Mann-Whitney P < 0.000; Table 5).


Table 5. Summary of all gillnet sets and minimum and maximum depths of sets that captured sturgeon. Comparisons for all sets, and for sets excluding R-2 and S-1, are included.

Set Minimum Set Depth Maximum Set Depth

Depth (m) Capture sets All sets Capture sets All sets All Sets

Minimum 5.2 0.9 10.1 1.3 Maximum 25.5 26 29.2 34.4

Mean 15.7 10.7 19.6 14.5 Mann-Whitney U =4846.0 P-Value < 0.000 U =5279.5 P-Value < 0.000

Sets excluding R-2 and S-1 Minimum 5.2 1.2 10.1 1.3 Maximum 25.5 26 29.2 34

Mean 15.7 12.1 19.6 16.2 Mann-Whitney U =4846.0 P-Value < 0.000 U =5279.5 P-Value < 0.000

When comparing sets from all spatial strata, there was a significant difference in the minimum depth distribution of sets that captured sturgeon and all net sets (Kolmogorov-Smirnov, ks=0.38 P<0.000). Minimum set depth comparisons (Figure 6) illustrate that, compared to all net sets, those that captured sturgeon were proportionally lower in depths under 15 m, and proportionally higher in depths over 15 m. There was also a significant difference in the maximum depth distribution between sets that captured sturgeon and all net sets (Kolmogorov-Smirnov, ks=0.34 P<0.000). Similarly, maximum set depth comparisons (Figure 7) showed that, compared to all sets, sturgeon captures were proportionally lower at depths of 0-11 m, relatively equal at 11-19 m, and higher at depths greater than 19 m. The higher proportion of sturgeon captures at minimum depths of greater than 15 m and maximum depths of greater than 19 m, suggests that habitat use is highest in river depths of 15 m and deeper. Comparisons of set depth, excluding sets from spatial strata S-1 and R-2 yielded similar results. A significant difference occurred in the minimum depth distribution between sets that captured sturgeon and all net sets (Kolmogorov-Smirnov, ks=0.29 P=0.001). Excluding sets from R-2 and S-1 affected the frequency of sets in the shallowest habitat (0-5 m), but did not change the overall shape of the frequency distribution (Figures 9a and b). There was also a significant difference in the maximum depth distribution between sets that captured sturgeon and all net sets (Kolmogorov-Smirnov, ks=0.26 P=0.004). Again, excluding sets from R-2 and S-1 affected the frequency of sets in the shallower habitat (0-9 m), but did not change the overall shape of the frequency distribution (Figure 7 a, b). The minimum set depth frequency distributions exhibit a low relative frequency of minimum set depths from 7-15 m (Figure 6). The irregular shape of the minimum set depth frequency distribution is the result of field constraints resulting from the depth stratification scheme. Few sets were placed at minimum depths from 7-15 m in order to prevent the maximum depth of these shallow sets exceeding 15 m, the stratification boundary for set depth.


Figure 6. Proportion of net sets at different minimum depths for all sets vs. those that captured

sturgeon (a), and all sets vs. those that captured sturgeon, excluding sets from R-2 (East Channel) and S-1 (Corn Creek Slough) (b).

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Figure 7. Proportion of net sets at different maximum set depths for all sets vs. those that

captured sturgeon (a), and all sets vs. those that captured sturgeon, excluding sets from R-2 (East Channel) and S-1 (Corn Creek Slough) (b).

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4.1.1.5 Gill Net Selectivity Larger mesh size gill nets captured juvenile sturgeon more efficiently than the small mesh size in 2001. The CPUE for sets of 5 cm stretch mesh size was more than two times as high as sets with 2.5 cm stretch mesh size (Table 6).

Table 6. Summary of catch and catch-rate (CPUE= no. juveniles caught/net hour) of juvenile white sturgeon captured, stratified by mesh size, in Kootenay River and Lake.

Mesh Size Sturgeon Captures Effort CPUE

(cm) %(n) %(hr) n/hr 2.5 13 (13) 24 (92.6) 0.140 5 87 (84) 76 (295.3) 0.285

Total 100 (97) 100 (387.9) 0.250 To further investigate gill net selectivity, a statistical comparison of mesh size capture efficiencies was completed when sets of 2.5 and 5 cm mesh were stratified by sets that captured sturgeon and all sets (Table 7). There was no significant difference in the frequency of these sets that captured sturgeon (Yates continuity correction, chi-square χ2 = 0.412, P = 0.521). For the investigation of mesh size capture efficiency, a post hoc power analysis was performed to investigate if there was no effect (no capture efficiency difference) or whether the analysis had a low probability of detecting an effect if one was present (Peterman 1990). The power of the effect size observed in the sample and the detectable effect size was estimated with G*Power software (Erdfelder et al. 1996; Buchner et al. 1997). The detectable effect size was estimated when alpha and beta were set at 0.05 and 0.20, respectively and with the observed sample size and variance (Peterman 1990). In the comparison of mesh size capture efficiencies, the detectable effect size (w = 0.28) was much higher than the observed effect size (w = 0.04), and thus power was very low (power = 0.07). The low power of this test indicates that, if there was a difference in capture efficiencies, there was a low probability of detecting it.

Table 7. Summary of the number of sets that captured sturgeon and all sets, stratified by mesh size.

Mesh Size Sturgeon Capture Sets All Sets Total (cm) n (%) n (%) n (%) 2.5 10(18) 81(23) 91(23) 5 43(82) 257(77) 300(77)

Total 53(14) 338(86) 391(100) Chi-Square

P Value 0.521


4.1.1.6 Crawford Bay Sampling Independent from our Kootenay River studies, one day of gill net sampling for juvenile sturgeon was spent on the Crawford Creek delta in Kootenay Lake. Despite some sampling effort in previous years, no juvenile sturgeon have ever been captured in Crawford Bay (RL&L 1998). In 2001, a total of 12 net sets resulted in 15.0 net-hours of effort on September 4 (Appendix H). Minimum set depths ranged from 3 to 17.3 m with a mean depth of 8.5 m. Maximum set depths ranged from 17.9 to 23.3 m (mean 21.7 m). Again in 2001, no juvenile sturgeon were captured at this location. By-catch included yellow perch, northern pikeminnow, and mountain whitefish, for a total of 12 fish (Appendix I).

4.1.2 Cod Traps Cod traps were set in ten locations for a total of 10.2 trap-days of effort (Figure 8; Appendix F). Sampling effort was concentrated between river kilometre 145 and 170. Trap depths averaged 21.9 m (ranged 17.2- 26.0 m). Two of the ten sets were completed using a cod trap that had been modified with a solid piece of smooth fabric sewn into the lead. It was hoped this modification would improve the capture efficiency of these traps by allowing easier passage through the trap lead for juvenile sturgeon. No sturgeon were captured in any trap sets. By-catch was low and included twelve fish captured in the eight un-modified trap sets; no fish captured in the two modified cod trap sets (Appendix G).

4.1.3 Angling An estimated 40 rod-hours were expended on the Kootenay River. Angling locations were not recorded, but were concentrated between river kilometre 150 and 170. Catches of species other than sturgeon were high and consisted primarily of peamouth and northern pikeminnow. These two species accounted for catches in the range of 5-7 fish/rod hour. One juvenile and one adult sturgeon were captured through angling efforts (Table 8). Both sturgeon were angled using small pieces of kokanee spawner carcass. Table 8. Summary of data from sturgeon captured by angling.

Length (mm) Weight Missing Scutes New Date Fork Total (g) L# R# Pit Tag # Pit Tag#

7-Aug-01 1495 1690 27700 - - - 7F7D3E2051 7-Sep-01 320 405 225 9 8 423D53360B


Figure 8. Cod trap set locations.


4.1.4 Life History The length of juvenile white sturgeon captured in 2001 in the Kootenay River and on the Creston Delta ranged from 190 to 705 mm FL (mean 298 mm; Figure 9, Appendix B). The majority of captures (95%) in 2001 were hatchery fish from the 1999 brood year. Juvenile white sturgeon captures from this year class ranged in length from 190 to 390 mm FL (mean 283 mm). The large number of captured juveniles from the 1999 brood year is apparent in the length frequency histogram as a large proportion of fish between 200 and 400 mm in length (Figure 9). The weight of juvenile white sturgeon captured in 2001 ranged from 45 to 2230 g with a mean weight of 195g (Appendix B). The weight of juvenile white sturgeon from the 1999 brood year ranged from 45 to 315 g (mean 134 g). Juvenile sturgeon captured in 2001 ranged in age (based on IDFG database) from 2 to 11 years (mean 2.3 years).

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Figure 9. Length frequency histogram for juvenile sturgeon captured in 2001. Condition factor is recognized as an indicator of forage, feeding and health problems for wild fish and hatchery fish adapting to the natural environment (Ricker 1975; Ireland et al. draft 2001). The relative weight index (Wr) has become the primary method of comparing the condition of white sturgeon populations through most of their range (Beamesderfer, 1993; Ireland et al. in prep. 2001). In the contrast with traditional approaches to condition factor, the relative weight index facilitates comparisons among different populations and between individuals of different lengths (Beamesderfer 1993). The index is expressed as a percent where 100% represents a sturgeon population in better than average condition. The relative weight index (Wr) was calculated using the following formula (Beamesderfer 1993):

100*)/( βαLWWr =


where W is the fish weight, α is a regression line intercept for the Kootenai River white sturgeon population (7.13E-07), L is the total fish length and β is a regression line slope for the Kootenai River white sturgeon population (3.394; from Beamesderfer 1993). The index for all juvenile sturgeon captured in 2001 ranged from 64 to 166% (mean 82.2%). The relative weight of sturgeon released in the fall of 2000 and recaptured in 2001 ranged from 68 to 167% (mean 90.4%). Of the 32 hatchery recaptures from stocking in the fall of 2000, 27 (84%) showed a decrease in relative weight between release and recapture. The mean change in relative weight for this group was -12%, with a range of -38 to 66%. The relative weight of sturgeon released in the spring of 2001 ranged from 64 to 91% (mean 78.5%). Of the 52 hatchery recaptures, stocked in the spring of 2001, 50 (96%) showed a decrease in relative weight between release and recapture. The mean change in relative weight for this group was -17%, with a range of -70.2 to 3.5%. All other juveniles captured in 2001 (n=5) ranged in relative weight from 76 to 83% (mean 79.7%). Previous weight data was only available for four of these fish. Three of these four fish showed an increase in relative weight with only one fish decreasing (range -2.5 to 6.4%). 4.2 Recapture Information All juvenile sturgeon captured in 2001 were hatchery release recaptures or recaptures of wild fish marked on previous years. One of the two adult sturgeon captured in 2001 was a recapture. Five (5%) of the 97 juvenile sturgeon captured in 2001 had either lost their PIT tag or had a PIT tag that was non-functional or not recognized by the reader unit; however, it was not possible to differentiate between these cases. Fish with missing or non-functioning PIT tags were identified by the presence of scute marks. Based on observations of fish size and scute marks, these fish were likely hatchery releases from the 1999 brood year. However, we also found occasional inconsistencies in scute marking patterns (e.g. L10 scute missing instead of L9) that precluded definite identification of the origin of some fish (Appendix B). Previous catch information was summarized by matching PIT tag numbers to those recorded in the IDFG database. Unfortunately, for four records, there was no match found in this database. In addition, the weight of one fish was not recorded on the previous capture date, and therefore, comparisons of growth were completed without the inclusion of this record. Juveniles were at large for 31 to 2192 days between captures (mean 242 days; Appendix C). All sturgeon recaptured in 2001 had moved downstream, with a maximum movement of 124 km over a period of 2192 days. Of the 84 hatchery fish recaptured from the 1999 brood stock year, 10 were stocked at river kilometer 199.5 (Copeland Bridge and 74 were stocked at the Canada/US border (river kilometer 170). Of the ten recaptures originally stocked at the Copeland Bridge, 10% were from the fall 2000 release and 90% were from the spring 2001 release. In contrast, of the 74 recaptures originally stocked at the Canada/US border, 42% were from the fall 2000 release and 58% were from the spring 2001 release.


Mean growth rates for all juveniles, measured as TL, FL and mass, were higher than fish released in fall, 2000, but lower than fish released in spring, 2001 (Table 9). Only 9 (9%) fish lost weight, eight of which were hatchery fish stocked in the spring of 2001, and recaptured later that year. One fish that lost weight was a fish of unknown year class previously captured in summer, 2000. Table 9. Growth rates for juvenile sturgeon recaptured in 2001.

Release Group Minimum (cm/yr) Maximum (cm/yr) Mean (cm/yr) All Juveniles 1.4 22.4 9.2

Fall 2000 1.9 9.8 5.2 FL (cm/yr)

Spring 2001 6.6 22.4 12 Release Group Minimum (cm/yr) Maximum (cm/yr) Mean (cm/yr)

All Juveniles 0.11 27.1 9.7 Fall 2000 2.1 10.7 5.8

TL (cm/yr)

Spring 2001 6.6 27.1 12.4 Release Group Minimum (g/yr) Maximum (g/yr) Mean (g/yr)

All Juveniles -68.7 263.6 63.8 Fall 2000 11.5 168.7 45.1

Weight (g/yr)

Spring 2001 -68.7 146.8 69.3 4.3 Sonic Tagging A total of 3 juvenile sturgeon were sonic tagged on the Creston Delta in August, 2001 (Table 10). Subsequently, 7 days of sonic tracking were completed as part of other field work on the Kootenay River. All 3 fish were located in this period; however, August was the last time all the fish were located in one sampling day. Sonic contacts were restricted to the Creston Delta and the lowest 2 kilometers of the Kootenay River (Figures 10, 11 and 12). Since August 2001, all 3 tagged fish have not been accounted for at some point. It is probable that these fish had moved into deep water in Kootenay Lake, but poor weather conditions (high wind and waves) and time restrictions made tracking these fish impossible. Tracking will continue until the summer of 2002, as the battery life of tags is anticipated to expire in August 2002. As such, information on habitat use in spring has not yet been collected. Table 10. Summary of life history information from the three sonic tagged juvenile sturgeon.

Length (mm)Date Fork Total L# R# PIT Tag # Comments

15-Aug-01 440 513 9 5 504E6D181C Sonic tagged with tag # 828 / Frequency 72 kHz.

15-Aug-01 520 600 9 6 504F6C7F1BDorsal fin split / Sonic tagged with tag # 832 / Frequency 74 kHz.

16-Aug-01 705 805 9 3 7F7D424B72 Sonic tagged with tag # 837 / Frequency 76 kHz / External scute drill method.

Scutes


Figure 10. Tracking locations of a juvenile sturgeon, sonic tag code 8-2-8, on the Kootenay

River.



River.



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4.4 Temperature Recorders Five temperature recorders were deployed in the study area; 4 recorders were deployed in the Kootenay River and surrounding backchannel and slough habitats, and 1 was deployed on the Creston Delta (Table 11, Figure 13). Water temperatures in the Kootenay River and surrounding back channel habitats followed a similar regime throughout the study period (Figure 14). Near the end of July, the Corn Creek slough provided the coolest temperatures, while Leach Lake provided the warmest. In the last few weeks of August, and in most of September, the temperatures recorded in all four locations were very similar, with less than a degree separating temperatures at all locations. The maximum temperature in any of the four locations was recorded at 21.9°C in Leach Lake on August 19. The minimum temperature in any of the four locations was recorded at 15.6°C in Six Mile Slough on September 11. The temperatures recorded in all four Kootenay River locations were suitable for sturgeon rearing. Table 11. Location and depth, as well as deploy and recovery dates of temperature recorders.

Location Depth Date Date (m) Deployed Recovered

Corn Creek Slough 5 24-Jul-01 24-Sep-01 Kootenay River 12 24-Jul-01 24-Sep-01 Leach Lake – Channel into Pond #1 1.5 24-Jul-01 24-Sep-01 Six Mile Slough – Pond #2 3.3 24-Jul-01 24-Sep-01 Creston Delta 15 26-Jul-01 24-Sep-01

The three back channel habitats which were measured for temperature showed significant morphological differences. The Corn Creek Slough and the Kootenay River are connected by an open channel. Flow in the Corn Creek Slough is unidirectional, driven by the inflow from Corn Creek and other small tributaries. Leach Lake and Six Mile Slough are enclosed by dikes, and showed no signs of any current. While parts of Leach Lake have a small amount of inflow from Summit Creek and other tributaries, Six Mile Slough has no discernable inflow. Temperatures in Kootenay Lake on the Creston Delta were extremely variable, ranging from a minimum of 8.4°C on August 5 to a maximum of 20.4°C only 11 days later (Figure 15). Beginning August 5, temperatures rose from 8.4°C to 18.8°C over a period of 5 days. Extreme fluctuations in temperature similar to this event occurred on at least four separate occasions in the two months that temperatures were recorded on the delta. Such fluctuations in temperature were likely the result of storm events which forced cold hypolimnetic water into the epilimnion.


Figure 13. Location of temperature recorders deployed in 2001.


Figure 14. Water temperatures for the Kootenay River and nearby slough habitats, July 24 through September 24, 2001.

Figure 15. Water temperatures for Kootenay Lake at the Creston Delta, July 26 through September 24, 2001.

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5.0 Discussion 5.1 Gear Efficiency In 2001, we again tested the utility of cod traps for capturing juvenile sturgeon. Despite a larger number of juvenile sturgeon in the study area than previous years, none were captured in these traps. By-catch was also low in comparison to gill nets. Based on the data from the previous sampling program (Vandenbos and Spence 2001) and the limited amount of work completed in 2001, it is apparent cod traps are not a suitable method for sampling juvenile sturgeon. Although angling was only pursued on a casual basis and not as the primary means of sampling, enough data was collected for a preliminary evaluation of its value as a capture method for juvenile sturgeon. Only one juvenile sturgeon was captured in an estimated 40 rod hours, suggesting angling was not particularly effective. In some cases, juvenile sturgeon may have been precluded by other more aggressive species present in large numbers and attempting to feed on the bait. Fishing with other baits and in habitats with high concentrations of sturgeon and lower concentrations of non-target species may address this problem. Angling may therefore prove to be more efficient in the future as knowledge of juvenile habitat use improves and as the number of juvenile sturgeon in the study area increases. On the Fraser River, recreational anglers targeting adult sturgeon frequently catch juveniles (L. Hildebrand, pers comm.). As in the past, gill nets proved to be the most effective method of capturing juvenile sturgeon. A comparison of mesh size capture efficiencies showed that 5 cm mesh captured fish more effectively than 2.5 cm mesh. Since the majority (95%) of sturgeon captured in 2001 were 2 year old hatchery fish, the difference in capture efficiency is primarily of comparison of the efficiency of these mesh sizes at capturing fish of that size. Size selectivity of gill nets by mesh size is widely recognized (McCombie and Berst 1969, Hamley 1975 and references therein, Hilborn and Walters 1992) and previous sampling programs for juvenile sturgeon studies on the Fraser River have fished multiple mesh sizes to allow for the capture of all juvenile age classes (Lane and Roseneau, 1993). Also, two inch mesh is used to capture YOY sturgeon on the Columbia River because it is more selective for fish <35 cm than other mesh sizes (Burner et al. 2000). The mesh sizes used in 2001 were effective at capturing most of the age classes of juvenile sturgeon known to be present in the study area. However, few fish larger than age 2 were captured (n=5, 5% of 2001 sample). It is unclear to what degree this is a function of relatively few age 2+ fish, gill net selectivity, or a combination of these factors. Given that different mesh sizes result in size selectivity and that the age structure of the juvenile population will continue to expand with further hatchery releases, larger mesh sizes similar to mesh sizes used on the Fraser River (Lane and Roseneau, 1993) could be used to ensure the entire spectrum of young sturgeon in the population are represented in the catch. 5.2 Distribution of Catch Gill net catch rates were highest in the 10 kilometres of river nearest the Canada/US


border (river kilometer 160-170) and generally declined as we moved downstream towards Kootenay Lake. This trend is likely the result of downstream dispersion from hatchery stocking locations at and above the border (river kilometer 170 and 199.5+). Catch rates also increased from the first sampling period in June and early July (CPUE 0.142) through to the last sampling period in late August and early September (CPUE 0.371). This increase may be a function of increased fish movement in later summer, additional fish moving into the study area later in the year from upstream locations (immigration), or the location of fish in more of the sample area (better distribution), however identification of the cause of temporal differences in catch rate was not possible. This trend of increased catch rates in late summer was also noted in 2000, while catch rates in 1999 were variable throughout the summer with no clear pattern (Vandenbos and Spence 2001). No sturgeon were captured in the two backchannel areas sampled on the Kootenay River (Corn Creek Slough (S-1) and the East Channel of the Kootenay River (R-2)). Although studies on juvenile sturgeon in the Fraser River (Lane and Roseneau, 1993) indicated that backchannel areas were consistently used as juvenile rearing habitat, backchannel areas with unidirectional flow and depths of less than 5 meters were rarely used. These two areas (R-2 and S-1) both have unidirectional flow and only one small area in the East Channel (R-2) that exceeds 5 meters in depth, and therefore, it is possible that these areas do not represent suitable juvenile habitat. Data on capture depth from 2001 indicated that juvenile sturgeon in the Kootenay River primarily used habitat greater than 5 and less than 31 m in depth, as all captures were concentrated in this range despite effort in shallower and deeper habitats. Captures were most common in deeper habitats within the river (mean set depth of captures; minimum 15.7 m, maximum 19.6 m). Also, the sampling methodology stratified net sets by depths of greater and less than 15 m, of which the sets greater than 15 m captured proportionally more sturgeon than sets less than that depth. This use of deep lake and river habitats has also been documented in previous studies on white sturgeon in this area (Young and Scarnecchia 1999, 2000; Vandenbos and Spence 2001) and on the Columbia River (Beamesderfer et al. 1989, DeVore et al. 1993, Kerr et al. 2001). 5.2 Life History The length of juvenile white sturgeon captured in 2001 in the Kootenay River and on the Creston Delta ranged from 190 to 705 mm FL (mean FL=298 mm; Appendix B). Juveniles captured in 1999 and 2000 were larger than those captured in 2001, with a minimum and maximum FL of 260 and 885 mm, and 455 and 1020 mm in 1999 and 2000 respectively (Vandenbos and Spence 2001). The smaller size of fish in 2001 is an artefact of the presence of younger fish from a recent 1999 brood year hatchery release at the upper end of the study area. In fact, the majority of captures (95%) in 2001 were hatchery fish from the 1999 brood year. Juvenile white sturgeon captures from this year class were relatively small and ranged in length from 190 to 390 mm FL (mean =283 mm).


The mean total and fork length growth rate for all juvenile sturgeon captured in 2001 was similar at 9.7 and 9.2 cm/yr respectively, although significant variation occurred around these means. Present study results show higher growth rates than longer term baseline data on hatchery fish growth rates in the Kootenay River (mean 6.4cm/yr; Ireland et al. draft 2001). This difference in growth rate is probably the result of high numbers of age two fish (95% of total sample) in our sample, since greater length growth generally occurs among these smaller juvenile fish (Ireland et al. draft 2001). The mean weight growth for all juvenile sturgeon captured in 2001 was much lower than baseline data on hatchery fish growth rates in the Kootenay River (Ireland et al. draft 2001). The difference in weight growth rate may again be the result of high numbers of age two fish (95% of total sample) in the 2001, as little or no weight gain often occurs among fish within the first two years of release (Ireland et al. draft 2001). The mean total length growth rate of hatchery sturgeon released in the fall of 2000 was lower than the rate for fish released in the spring of 2001. Similarly, the mean weight growth for juveniles released in fall 2000 lower than the rate for fish released in spring 2001. Fish stocked in the spring and then recaptured later that summer have been in the river for the period of the year that has the highest water temperatures and food availability, both of which increase sturgeon growth. In contrast, fish that have spent a winter and spring in the river system have been in the river during the time expected to yield the lowest growth rates, as well as the productive summer season. This difference in riverine residence period probably accounts for the disparity in growth rates between these two groups. Data collected from this same cohort in future years will likely yield comparisons of fall and spring release group growth rates that are more applicable to evaluating these two stocking strategies. The mean relative weight at recapture for all juveniles captured in 2001 was 82.2% and was slightly higher than baseline data on Kootenay River hatchery juveniles (mean 78%). The mean relative weight of hatchery sturgeon released in fall 2000 (90.4%) was higher than the mean relative weight of sturgeon released in spring 2001 (78.5%). Ireland et al. (draft 2001) reported that, for juvenile hatchery released sturgeon on the Kootenay River, condition factor is inversely correlated with growth in total length. Thus, given the differences in TL growth rates observed between these two release groups, the fall release group would be expected to have a higher condition factor. The relative weight of recaptures generally decreased between release or previous capture and recapture. In 2001, 91% of juveniles recaptured showed a decrease in relative weight. Ireland et al (draft 2001) reported that 77% of hatchery fish lost weight between release and recapture. Of the hatchery sturgeon that were released in the fall of 2000 and the spring of 2001 (1999 progeny), 92% showed a decrease in relative weight, while only 25% of the hatchery fish from previous years releases (n=4) showed a loss in relative weight. The decrease in relative weight noted in 2001 for most recaptures is most likely a result of adaptation of hatchery released fish to the natural environment.


5.3 Movements All recaptured juveniles were captured downstream from their previous capture or hatchery release location. However, because 95% of the fish captured in 2001 were from hatchery releases above the study area and had not been captured in the river previously, it is possible that the movement of individuals downstream was part of a dispersal of fish from stocking locations and was taking place in both an upstream and downstream direction. If this is the case, our study would only sample fish moving downstream because the study area was located entirely downstream from all stocking locations. Downstream movement of juvenile sturgeon was also observed in previous sampling programs on the Kootenay River. In 1999 and 2000, all but one juvenile sturgeon was captured downstream from its previous location or hatchery release site (Vandenbos and Spence 2001). In these years it was noted that the majority of sampling programs had taken place in Idaho, upstream of the study area. Again, this increased the probability that recaptures would have been originally captured upstream, and observed movement patterns may have been an artefact of the previous sampling programs and stocking locations. 5.4 Water Temperature Temperatures recorded in the Kootenay River and associated slough/backchannel habitats showed similar temperature regimes during the sample period. Although variation in temperature existed between the sites, all temperatures recorded were within a range favourable for juvenile sturgeon rearing. The summer of 2001 was dry and very warm, and therefore the data collected may represent a worst case scenario for maximum water temperatures in these habitats. Backchannel habitats in Leach Lake and Six Mile Slough exhibited temperatures that were up to 2ºC warmer than the river main-stem for a period of the study, while Corn Creek Slough exhibited temperatures that were less than or similar to the temperature in the Kootenay River. On the Fraser River, backchannel habitats that were regularly used by sturgeon had temperatures warmer than those in the Fraser River main-stem by up to 5ºC (Lane and Roseneau, 1993). The temperatures recorded in Leach Lake and Six Mile Slough, which are inaccessible to sturgeon due to the presence of dikes, suggest that water temperatures in these habitats are suitable for juvenile sturgeon rearing. Although initial investigations show promising results, it is still unclear if these areas are suitable for sturgeon rearing as water chemistry has yet to be investigated and the impact on sturgeon of numerous non-native species in these bodies of water is unknown . There was no obvious relationship between catch rates (CPUE) and water temperature during the study period. On the Creston Delta it was not possible to identify trends between temperature and CPUE as temperatures recorded on the Delta were extremely variable and catch rates were extremely low (n=4). The trends in CPUE and temperature on the Kootenay River also did not appear to be correlated. On the Kootenay River, catch rates increased from the first time strata through to the last (July to September), while water temperatures increased through July and early August and then decreased in late August and September. From the data available through this sampling program it appears that water temperature and catch rates are not closely related. However,


continuous catch data from one location over the whole study period would be necessary to fully evaluate this relationship.



Recommendations

� Although a site index approach will be used to sample juveniles in 2002, the stratified sampling program aimed at maintaining an even distribution of sampling effort used in 2001 should be implemented every 4 years to track changes in habitat use as the juvenile populations grows.

� Consultation with the Idaho Department of Fish and Game, and the Kootenai

Tribe of Idaho should take place before sampling in 2002 to develop a consistent approach to sampling over the entire range of white sturgeon in the Kootenay/Kootenai River.

� 2.5, 5, and 7.5 cm stretched measure nets should be used in future sampling

projects, to avoid biases associated with mesh size selectivity and to facilitate a better understanding of net size capture efficiencies.

� Angling should continue to be used, on a casual basis, between sets to capture

sturgeon; however an accurate record of location, effort, and catch should be recorded, and various types of bait should be used on an experimental basis.

� An expanded sonic tagging program, similar to the one carried out in 2001, should

be considered in future years to identify juvenile habitat use throughout Kootenay Lake.

� Temperature data indicated a trial stocking program of surplus age 1+ juvenile

sturgeon could be carried out in one of the two impounded slough habitats along the Kootenay River to identify the utility of these areas for juvenile sturgeon rearing.

� Standard cod traps again proved ineffective at capturing sturgeon in 2001 and

should not be used as a sampling method in future years.



Acknowledgements Don Miller of Kootenay Wildlife Services assisted in much of the fieldwork. Beth Wright of the Ministry of Water, Land and Air Protection, Tola Cooper of the Department of Fisheries and Oceans Canada as well as Laird Siemens and the staff at the Kootenay Trout Hatchery also provided field assistance. Jay Hammond (MWLAP) and Vaughn Paragamian (IDFG) provided administrative support and technical direction. In addition, the Bonneville Power Administration (Columbia Basin Fish and Wildlife Authority) funded the project through the Idaho Department of Fish and Game and the Kootenai Tribe of Idaho.



Literature Cited Anders, P.J., C. Gelok and M.S. Powell. 2000. Genetic population structure of white

sturgeon , Acipenser transmontanus, in western North America based on mitochondrial DNA sequence analysis. University of Idaho, Center for Salmonid and Freshwater Species at Risk, Moscow, Idaho.

Beamesderfer, R.C. 1993. A Standard Weight (WS) Equation for White Sturgeon.

California Fish and Game 79(2): 63-69, 1993.

Beamesderfer, R.C., J. C. Elliot, and C.A. Foster. 1989. Report A. pages 5-52 In: A.A. Nigro (editor). Status and habitat requirements of white sturgeon populations in the Columbia River downstream from McNary Dam. Annual Progress Report to Bonneville Power Administration, Portland, Oregon.

Buchner, A., E. Erdfelder, and F. Faul. 1997. How to Use G*Power [WWW document].

URL http://www.psychologie.uni-trier.de:8000/projects/gpower/how_to_use_ gpower.html.

Burner, L.C., J.A. North, R.A. Farr and T.A. Rein. draft 2000. White Sturgeon

mitigation and restoration in the Columbia and Snake rivers upstream from Bonneville Dam. Report C – Annual Progress Report , April 1999 – March 2001. U.S. Geological Survey, Western Fisheries Center. Cook, Washington, USA.

Cohen, J. 1988. Statistical power analysis for the behavioral sciences. 2nd edition. L.

Erlbaum and Associates, Hillsdale, N.J. Daley, R.J., E.C. Carmack, C.B.J. Gray, C.H. Pharo, S. Jasper, and R.C. Wiegand. 1981.

The effects of upstream impoundments on Kootenay Lake, B.C. Canada Inland Waters Directorate, Research Institute, Scientific Series, West Vancouver, British Columbia.

DeVore, J.D., B.W. James, C.A. Tracy, and D.A. Hale. 1993. Dynamics and potential production of the white sturgeon population in the Columbia River downstream from Bonneville Dam. Report G. pages 137-174 In: R.C. Beamesderfer and A.A. Nigro (editors). Status and habitat requirements of white sturgeon populations in the Columbia River downstream from McNary Dam. Final Report to Bonneville Power Administration, Portland, Oregon.

Erdfelder, E., F. Faul, and A. Buchner. 1996. GPOWER: A general power analysis

program. Behavior Research Methods, Instruments, and Computers 28:1-11. Hamley, J.M. 1975. Review of Gillnet Selectivity. Journal of the Fisheries Research

Board of Canada. 32 (11): 1943-1969.


Hilborn, R and C.J Walters. 1992. Quantitative Fisheries Stock Assessment; Choice, Daynamics and Uncertainty. Chapman & Hall, New York, NY.

Hildebrand, L. Personal communication. Senior Fisheries Biologist, R.L. & L.

Environmental Services Ltd, Castlegar B.C. Ireland, S., J.T. Siple, V.L. Paragamian, V.D. Wakkinen, and R.P. Beamesderfer, draft

2001. Conservation Aquaculture of White Sturgeon from the Kootenay River, Idaho and the Success of Hatchery-reared Juveniles in Adapting to Natural Conditions.

Kerr, J.C., R.Farr and T. Rien. 2001. White Sturgeon mitigation and restoration in the

Columbia and Snake rivers upstream from Bonneville Dam. Report A – Annual Progress Report , April 2000 – March 2001. Oregon Department of Fish and Wildlife, Clackamas, OR.

Lane, E.D and M. Rosenau, 1993. The Conservation of Sturgeon Stocks in the Lower

Fraser River Watershed. A Baseline Investigation of Habitat, Distribution, Age, and Population of Juvenile White Sturgeon (Acipenser transmontanus) in the Lower Fraser River, downstream of Hope, B.C.. Habitat Conservation Trust Fund Project – Final Report

McCombie, A.M. and A.H. Berst. 1969. Some effects of shape and structure on fish

selectivity in Gillnets. Journal Fisheries Research Board of Canada. 26(10): 2681-2689.

Northcote, T.C. 1973. Some impacts of man on Kootenay Lake and its salmonids. Great

Lakes Fishery Commision, Technical Report No. 2. Paragamian, V.L., G.R. Kruse and V. Wakkinen. 1999 draft MS. Kootenai River white

sturgeon investigation annual progress report. Project No. 88-65 Idaho Department Fish and Game.

Partridge, F. 1983. Kootenai River fisheries investigations in Idaho. Completion Report.

Prepared for the US Army Corps of Engineers by the Idaho Department of Fish and Game.

Parsley, M.J, L.G. Beckman, and G.T. McCabe, Jr. 1993. Spawning and Rearing Habitat

Use by White Sturgeons in the Columbia Downstream from Mcnary Dam. Transactions of the American Fisheries Society. 122:217-227, 1993

Parsley, M.J., D.G. Gallion, K.M. Knappenman, and P. Kofoot. draft 1999. White

Sturgeon mitigation and restoration in the Columbia and Snake rivers upstream from Bonneville Dam. Report A – Annual Progress Report , April 1998 – March 1999. Oregon Department of Fish and Wildlife, Clackamas, OR.


Peterman, R.M. 1990. Statistical power analysis can improve fisheries research and management. Canadian Journal of Fisheries and Aquatic Sciences 47:2-15.

R.L. & L. Environmental Services Ltd. 1999. Movements of white sturgeon in Kootenay

Lake, 1994-1997. Report prepared for B.C. Ministry of Environment, Lands and Parks, Nelson, B.C. R.L. & L. Report No. 613F: 22 p. + 4 app.

Spence, C.R. 1999. A Comparison of Catch Success Between Two Styles of Burbot

Traps in Lakes, pages 165-170. In: V.L. Paragamian and D.W. Willis (editors). Burbot Biology, Ecology, and Management. Publication Number 1, Fisheries Management Section of the American Fisheries Society. Spokane, WA.

Thomas, L., and F. Juanes. 1996. The importance of statistical power analysis: an

example from Animal Behaviour. Animal Behaviour 52:856-859. US Fish and Wildlife Service. 1999. Recovery Plan for the white sturgeon (Acipenser

transmontanus): Kootenai River Population. US Fish and Wildlife Service, Portland, Oregon. 96 pp. plus appendices.

Vandenbos, R. and C.R. Spence. draft 2001. Kootenay River White Sturgeon Studies,

Juvenile Sampling, 1999-2000. Report prepared for The Ministry of Environment, Lands and Parks, Nelson BC, by Cordilleran Ecological Research, Winlaw B.C.

Young, W. and D.L. Scarnecchia. 1999. Juvenile Habitat Use and Growth of Kootenai

River White Sturgeon, 1999 Annual Report. Report prepared for The Montana Department of Fish, Wildlife and Parks, Libby, MT, by the Department of Fish and Wildlife Resouces, University of Idaho.

Young, W. and D.L. Scarnecchia. 2000. Juvenile Habitat Use and Growth of Kootenai

River White Sturgeon, 2000 Annual Report. Report prepared for The Montana Department of Fish, Wildlife and Parks, Libby, MT, by the Department of Fish and Wildlife Resouces, University of Idaho.

Zar, J.H. 1996. Biostatistical analysis. 4th edition. Prentice-Hall Inc., N.J.



Appendices Appendix A. Summary of gill net set data, 2001.

Set Depth Stratum Mesh Size Set Time Set Depth Location2 Date ID ID ID1 (inches) (Minutes) Min Max Eastings Northings Comments

19-Jun-01 1 S DE 2 60 4.1 4.5 523998 5459059 19-Jun-01 2 S DE 2 70 4.5 8.0 524002 5459086 19-Jun-01 3 D DE 2 65 10.0 14.5 523947 5459261 19-Jun-01 4 D DE 2 70 10.0 19.0 523939 5459388 19-Jun-01 5 S DE 2 60 1.5 3.9 524040 5458970 19-Jun-01 6 S DE 1 62 1.4 3.8 524054 5459155 19-Jun-01 7 D DE 2 68 19.0 23.0 523881 5459276 19-Jun-01 8 D DE 2 73 18.1 24.0 523958 5459592 19-Jun-01 9 S DE 2 60 1.5 1.7 524200 5458256 19-Jun-01 10 S DE 1 60 1.3 1.5 524138 5459255 19-Jun-01 11 D DE 2 62 24.6 28.2 523815 5458390 19-Jun-01 12 D DE 2 63 17.8 23.5 524036 5459776 19-Jun-01 13 S DE 2 63 2.9 9.9 524039 5458374 20-Jun-01 14 D R-4 2 66 15.1 17.0 530182 5444259 20-Jun-01 15 S R-4 2 77 9.4 13.0 529939 5444294 20-Jun-01 16 S R-4 1 81 10.0 10.0 529520 5444181 20-Jun-01 17 D R-4 2 83 15.0 17.0 529090 5444077 20-Jun-01 18 D R-4 2 71 18.3 24.0 530362 5444106 20-Jun-01 19 D R-4 2 73 17.6 18.5 530410 5444017 Hung Up/ Fished OK 20-Jun-01 20 D R-4 1 75 22.2 29.3 528930 5444185 20-Jun-01 21 D R-4 2 76 18.6 23.0 528950 5444225 20-Jun-01 22 S R-4 2 70 8.7 9.4 530008 5443630 20-Jun-01 23 S R-4 2 67 5.0 5.8 529933 5442444 20-Jun-01 24 D R-4 2 78 16.6 25.0 530150 5442359 20-Jun-01 25 S R-4 1 78 5.0 9.0 530261 5442244 20-Jun-01 26 S R-4 2 68 9.5 10.8 530351 5441795 20-Jun-01 27 S R-4 1 60 6.9 7.1 530574 5440875 20-Jun-01 28 S R-4 2 65 8.1 8.8 530319 5439672 20-Jun-01 29 D R-4 2 70 18.0 24.0 530308 5436783 21-Jun-01 30 S R-2 2 72 2.5 3.6 526889 5448441 21-Jun-01 31 S R-2 1 72 2.5 2.8 526876 5448957 21-Jun-01 32 S R-2 2 70 3.0 3.1 526745 5449657 21-Jun-01 33 S R-2 2 73 1.3 4.1 526564 5450195 21-Jun-01 34 S R-2 2 70 3.5 4.1 524286 5454930 21-Jun-01 35 S R-2 2 62 2.6 5.0 524428 5455349


Set Depth Stratum Mesh Size Set Time Set Depth Location2

Date ID ID ID1 (inches) (Minutes) Min Max Eastings Northings Comments

21-Jun-01 36 S R-2 1 62 3.6 8.0 524598 5455429 21-Jun-01 37 S R-2 2 61 3.0 8.0 525321 5455752 21-Jun-01 38 S R-2 2 60 1.2 1.9 525363 5457265 21-Jun-01 39 S R-2 1 65 1.1 3.0 525203 5457758 21-Jun-01 40 S R-2 2 65 1.0 1.9 524665 5458850 21-Jun-01 41 S R-2 2 65 4.5 6.1 525535 5456597 22-Jun-01 42 S R-3 1 70 13.0 15.0 526457 5448001 22-Jun-01 43 S R-3 2 73 8.0 12.2 527704 5448521 22-Jun-01 44 D R-3 2 82 21.0 23.7 528178 5448526 22-Jun-01 45 D R-3 2 83 21.9 24.6 528277 5448427 22-Jun-01 46 S R-3 2 65 6.1 14.1 528127 5447689 22-Jun-01 47 D R-3 2 73 15.2 19.5 528051 5447336 22-Jun-01 48 S R-3 2 76 5.0 12.3 528881 5446883 22-Jun-01 49 D R-3 1 75 16.0 23.0 529990 5446722 03-Jul-01 50 S S-1 1 81 1.8 2.8 529514 5436529 03-Jul-01 51 S S-1 2 80 1.2 2.6 529577 5436281 03-Jul-01 52 S S-1 2 82 2.0 4.1 529676 5435767 03-Jul-01 53 S S-1 2 64 1.2 1.3 529520 5436641 03-Jul-01 54 S S-1 2 74 2.2 3.5 524462 5436744 03-Jul-01 55 S S-1 2 75 4.1 4.6 529441 5436772 03-Jul-01 56 S S-1 1 86 1.2 1.3 529621 5436837 03-Jul-01 57 S R-3 1 78 10.0 12.0 528909 5444498 03-Jul-01 58 S R-3 2 79 9.3 9.8 528921 5445021 03-Jul-01 59 S R-3 2 79 8.0 11.0 529365 5445967 03-Jul-01 60 D R-3 2 80 15.1 19.8 529945 5446679 04-Jul-01 61 S DW 2 73 3.9 6.6 522399 5456926 04-Jul-01 62 S DW 2 85 4.4 11.0 522494 5457029 04-Jul-01 63 D DW 1 84 18.0 18.5 522472 5457392 Adult Tangled Net/ may not fished for full 1h 04-Jul-01 64 D DW 2 87 16.7 22.0 522518 5457512 04-Jul-01 65 D DW 2 60 16.0 30.0 522310 5456932 04-Jul-01 66 D DW 2 61 20.0 34.0 522272 5457213 04-Jul-01 67 S DW 2 48 2.5 2.5 523104 5457269 04-Jul-01 68 S DW 1 60 2.0 2.0 523174 5457189 04-Jul-01 69 S DW 1 60 4.0 4.5 522328 5456322 04-Jul-01 70 S DW 2 64 4.0 6.0 522318 5456331



04-Jul-01 71 D DW 2 67 15.0 24.0 522242 5456245 04-Jul-01 72 D DW 2 69 18.0 23.0 522279 5456124 05-Jul-01 73 S R-1 2 64 5.5 6.9 522946 5455181 05-Jul-01 74 D R-1 2 65 21.0 28.0 522760 5454028 05-Jul-01 75 S R-1 1 70 7.2 12.3 522672 5453667 05-Jul-01 76 S R-1 2 75 4.0 12.0 522816 5453082 05-Jul-01 77 S R-1 2 60 6.0 12.0 523471 5452231 05-Jul-01 78 D R-1 1 60 15.5 16.5 523906 5452054 05-Jul-01 79 D R-1 2 62 16.0 19.0 524279 5451345 05-Jul-01 80 D R-1 2 64 16.0 21.5 524698 5451105 05-Jul-01 81 D R-1 2 60 19.0 22.2 524003 5450324 05-Jul-01 82 S R-1 2 62 14.0 14.9 524966 5450167 05-Jul-01 83 S R-1 1 64 5.0 12.5 524948 5449612 05-Jul-01 84 D R-1 2 63 24.0 30.0 525201 5448953 10-Jul-01 85 S R-6 1 60 10.9 14.5 536311 5428125 10-Jul-01 86 S R-6 2 72 11.4 12.2 536159 5428659 10-Jul-01 87 D R-6 2 70 16.5 17.2 535290 5430154 10-Jul-01 88 D R-6 2 88 15.0 21.0 535102 5430154 10-Jul-01 89 S R-6 2 58 7.2 11.0 533934 5430626 10-Jul-01 90 D R-6 2 60 20.9 22.3 533818 5430893 10-Jul-01 91 S R-6 1 31 2.0 9.5 534382 5431254 10-Jul-01 92 D R-6 2 69 19.0 23.0 535263 5431623 10-Jul-01 93 S R-6 2 62 7.5 10.0 534918 5432259 10-Jul-01 94 S R-6 1 66 6.9 7.4 534891 5432462 10-Jul-01 95 D R-6 2 69 25.5 26.2 534632 5432782 10-Jul-01 96 D R-6 2 76 20.0 22.6 534709 5432773 11-Jul-01 97 S R-6 2 31 1.2 2.0 536183 5427505 11-Jul-01 98 S R-6 1 63 7.0 13.0 536358 5427544 11-Jul-01 99 S R-6 2 64 9.9 10.0 536353 5427878 11-Jul-01 100 S R-6 2 69 13.0 15.0 536262 5428311 11-Jul-01 101 S R-6 2 61 13.5 14.5 536180 5428618 11-Jul-01 102 S R-6 2 75 7.2 13.7 536145 5428819 11-Jul-01 103 D R-6 1 75 15.2 17.7 535308 5430136 11-Jul-01 104 D R-6 2 78 18.7 20.6 535131 5430153 11-Jul-01 105 D R-6 2 60 15.2 16.8 535044 5430144




11-Jul-01 106 D R-6 1 65 15.1 16.5 534855 5430198 11-Jul-01 107 D R-6 2 62 18.4 20.2 533795 5430844 11-Jul-01 108 S R-6 2 62 8.0 11.4 533933 5430969 12-Jul-01 109 S R-5 2 59 4.8 12.0 533044 5432663 12-Jul-01 110 D R-5 1 60 15.8 19.8 532950 5432834 12-Jul-01 111 D R-5 2 64 15.0 18.6 532963 5432998 12-Jul-01 112 S R-5 2 70 8.8 11.8 533194 5433370 12-Jul-01 113 D R-5 2 67 15.0 19.1 533666 5434384 12-Jul-01 114 D R-5 2 75 19.0 26.0 533570 5434501 12-Jul-01 115 D R-5 1 88 15.0 20.7 533446 5434585 12-Jul-01 116 S R-5 2 90 10.7 12.0 532770 5434601 12-Jul-01 117 S R-5 1 60 4.1 9.1 531987 5435112 12-Jul-01 118 S R-5 2 60 3.9 9.5 531749 5435951 12-Jul-01 119 S R-5 2 63 8.6 9.0 531550 5437468 12-Jul-01 120 D R-5 2 65 15.0 19.8 531904 5437206 13-Jul-01 121 D R-5 2 70 15.0 19.1 531250 5437556 Did Not Fish/ Tangled 13-Jul-01 122 S R-5 2 72 4.6 8.2 530825 5437009 13-Jul-01 123 D R-5 2 75 15.0 18.3 530344 5436807 13-Jul-01 124 D R-5 1 74 16.8 23.0 530259 5436792 16-Jul-01 125 S DE 2 64 1.2 1.3 524690 5460057 16-Jul-01 126 S DE 2 63 6.7 8.3 524307 5460154 16-Jul-01 127 D DE 2 63 17.6 19.0 524167 5460103 16-Jul-01 128 D DE 1 63 26.0 28.5 524078 5460119 16-Jul-01 129 S R-2 1 60 1.3 2.1 524740 5458792 16-Jul-01 130 S R-2 2 63 3.0 1.9 524932 5458495 16-Jul-01 131 S R-2 2 62 4.2 6.0 525511 5456561 16-Jul-01 132 S R-2 2 65 2.5 6.0 525163 5455638 16-Jul-01 133 S R-2 2 61 3.7 5.2 524771 5455513 16-Jul-01 134 S R-2 2 62 4.2 8.0 524594 5455418 16-Jul-01 135 S R-2 2 67 3.6 4.0 524301 5454820 16-Jul-01 136 S R-2 1 73 3.5 3.9 524434 5454222 17-Jul-01 137 S R-2 2 66 2.3 3.4 525541 5451598 17-Jul-01 138 S R-2 1 63 3.2 4.5 526243 5450796 17-Jul-01 139 S R-2 2 72 2.1 5.0 526817 5449430 17-Jul-01 140 S R-2 2 71 2.3 3.9 526946 5448239



17-Jul-01 141 S DE 2 60 7.0 12.0 523940 5459126 17-Jul-01 142 D DE 2 63 16.0 22.0 523885 5458986 17-Jul-01 143 D DE 1 67 16.0 23.0 523951 5458720 17-Jul-01 144 S DE 2 67 6.0 14.2 524052 5458488 17-Jul-01 145 D DE 2 60 15.0 16.8 523901 5458340 17-Jul-01 146 S DE 1 61 9.0 13.5 523788 5458152 17-Jul-01 147 S DE 2 62 4.3 9.0 523548 5458070 17-Jul-01 148 D DE 2 69 17.0 21.0 523617 5458187 18-Jul-01 149 S DW 2 63 3.7 4.1 523085 5457855 18-Jul-01 150 D DW 1 71 15.0 19.0 522737 5457842 18-Jul-01 151 S DW 2 72 3.7 8.0 522683 5457689 18-Jul-01 152 D DW 2 76 15.2 20.9 522539 5457510 18-Jul-01 153 S DW 2 63 2.7 2.7 522687 5457401 18-Jul-01 154 D DW 2 61 15.0 17.0 522427 5457336 18-Jul-01 155 S DW 2 62 5.0 16.0 522357 5457134 18-Jul-01 156 D DW 1 65 15.0 24.7 522306 5456989 18-Jul-01 157 S DW 2 68 5.7 11.0 522535 5457126 18-Jul-01 158 S DW 1 60 6.7 15.0 522273 5456513 18-Jul-01 159 D DW 2 60 15.0 19.0 522230 5456386 18-Jul-01 160 D DW 2 60 15.0 21.8 522266 5456079 19-Jul-01 161 S R-1 2 61 4.3 11.6 525043 5449440 19-Jul-01 162 D R-1 1 60 15.0 16.3 524979 5449804 19-Jul-01 163 S R-1 2 60 9.0 15.0 525009 5450514 19-Jul-01 164 D R-1 2 67 15.0 18.6 524757 5451043 19-Jul-01 165 D R-1 2 83 15.0 18.1 524237 5451475 19-Jul-01 166 S R-1 2 89 4.0 13.5 523855 5452066 19-Jul-01 167 D R-1 1 100 18.0 21.2 523681 5452218 19-Jul-01 168 S R-1 2 102 4.0 10.0 523007 5452636 30-Jul-01 169 S R-1 1 60 6.1 7.1 522965 5454929 30-Jul-01 170 D R-1 2 60 18.5 20.8 522742 5453970 30-Jul-01 171 S R-1 2 68 10.0 14.5 522696 5453467 30-Jul-01 172 S R-1 2 66 8.7 14.9 523312 5452292 30-Jul-01 173 D R-3 2 62 22.0 30.0 525221 5448965 30-Jul-01 174 D R-3 2 67 22.0 27.1 525382 5448967 Net Wreck 30-Jul-01 175 D R-3 2 70 15.0 22.3 525946 5448645




30-Jul-01 176 S R-3 1 69 4.6 7.5 526471 5448065 30-Jul-01 177 S R-3 1 57 4.3 8.4 528001 5448589 30-Jul-01 178 D R-3 2 64 16.3 27.3 528263 5448395 30-Jul-01 179 S R-3 2 62 7.8 15.0 528052 5447352 30-Jul-01 180 S R-3 2 68 4.4 10.7 528987 5446931 31-Jul-01 181 D R-3 1 70 15.0 20.9 529994 5446719 31-Jul-01 182 D R-3 2 67 15.2 19.2 529955 5446647 31-Jul-01 183 S R-3 2 65 4.0 10.6 529359 5445956 31-Jul-01 184 S R-3 2 63 11.9 12.1 528903 5445154 31-Jul-01 185 D R-4 2 60 15.0 18.1 529029 5444113 31-Jul-01 186 S R-4 2 60 10.9 12.0 529176 5444113 31-Jul-01 187 D R-4 2 62 20.1 26.3 530319 5444180 31-Jul-01 188 S R-4 1 60 7.2 14.5 530364 5444013 31-Jul-01 189 S R-4 1 58 12.8 14.2 529906 5443521 31-Jul-01 190 D R-4 2 60 15.5 22.2 529817 5443443 31-Jul-01 191 S R-4 2 65 4.0 9.5 530291 5442230 31-Jul-01 192 D R-4 2 64 20.9 29.2 530280 5442281 Net Tangled/ lost adult/ fished OK 01-Aug-01 193 D R-4 2 63 19.1 23.4 530386 5436778 01-Aug-01 194 D R-4 2 64 15.1 22.8 530263 5436807 01-Aug-01 195 S R-4 2 72 7.7 8.4 529630 5437203 01-Aug-01 196 S R-4 1 71 8.1 8.4 529771 5438439 01-Aug-01 197 S R-5 1 64 6.0 13.8 531096 5437393 01-Aug-01 198 D R-5 2 67 15.0 19.8 531285 5437590 01-Aug-01 199 D R-5 2 69 15.5 19.7 531883 5437276 01-Aug-01 200 S R-5 2 69 10.1 11.5 531799 5436484 01-Aug-01 201 S R-5 2 65 9.1 10.1 531819 5435455 01-Aug-01 202 D R-5 2 68 17.1 20.9 532014 5434724 01-Aug-01 203 S R-5 2 80 9.0 14.2 533423 5434565 01-Aug-01 204 D R-5 1 78 19.0 26.0 533601 5434459 02-Aug-01 205 S R-5 2 66 10.0 12.7 533574 5434132 02-Aug-01 206 S R-5 2 67 8.8 11.5 533036 5433098 02-Aug-01 207 D R-5 1 74 16.0 17.7 532948 5432758 02-Aug-01 208 D R-5 2 77 18.0 23.7 532956 5432839 02-Aug-01 209 S S-1 1 55 0.9 1.6 529522 5436560 02-Aug-01 210 S S-1 2 61 2.6 4.4 529443 5436745




02-Aug-01 211 S S-1 2 63 1.2 1.6 529600 5436753 02-Aug-01 212 S S-1 2 64 0.9 1.7 529664 5436817 07-Aug-01 213 D R-6 1 64 15.1 17.3 536358 5428127 07-Aug-01 214 S R-6 2 72 8.7 9.3 536148 5428787 07-Aug-01 215 S R-6 2 74 8.9 12.8 535751 5429687 07-Aug-01 216 D R-6 2 79 15.5 18.8 535216 5430165 07-Aug-01 217 D R-6 2 94 16.0 19.3 535016 5430141 07-Aug-01 218 S R-6 2 95 6.8 7.2 534232 5430455 07-Aug-01 219 D R-6 2 95 17.5 21.7 533805 5430836 07-Aug-01 220 S R-6 1 105 4.4 14.5 533880 5430895 08-Aug-01 221 D R-6 2 60 20.0 22.5 533829 5430854 08-Aug-01 222 S R-6 1 70 12.0 13.4 534423 5431294 08-Aug-01 223 S R-6 2 72 11.2 12.7 535093 5431466 08-Aug-01 224 D R-6 2 77 18.0 26.2 535198 5431644 08-Aug-01 225 S R-6 2 70 3.5 9.6 534964 5432179 08-Aug-01 226 D R-6 2 71 19.4 20.6 534689 5432752 08-Aug-01 227 D R-6 1 80 24.0 28.1 534584 5432781 08-Aug-01 228 S R-6 2 83 9.4 12.1 534236 5432504 09-Aug-01 229 D R-6 2 60 25.9 29.3 534596 5432785 09-Aug-01 230 D R-6 1 61 18.0 22.0 534518 5432708 09-Aug-01 231 S R-6 2 61 6.5 11.6 534844 5432634 09-Aug-01 232 S R-6 2 63 8.6 10.1 534887 5432142 09-Aug-01 233 D R-6 2 64 22.0 28.0 535253 5431616 09-Aug-01 234 D R-6 2 68 15.0 16.6 535161 5431505 09-Aug-01 235 S R-6 1 72 6.9 10.7 534759 5431375 09-Aug-01 236 S R-6 2 74 7.0 15.0 534135 5431197 09-Aug-01 237 S R-6 2 66 10.0 14.0 534030 5432494 09-Aug-01 238 S R-6 1 59 8.0 13.8 533571 5432467 09-Aug-01 239 S R-5 2 74 11.5 13.0 533053 5432647 09-Aug-01 240 D R-5 2 81 17.6 21.5 532945 5432859 10-Aug-01 241 S DW 2 60 10.7 15.0 522519 5457257 10-Aug-01 242 S DW 2 62 5.5 15.0 522401 5457129 10-Aug-01 243 D DW 1 66 18.0 22.2 422307 5457340 10-Aug-01 244 D DW 2 69 18.5 22.5 522489 5457469 10-Aug-01 245 D DE 2 60 17.0 20.6 523952 5458697




10-Aug-01 246 D DE 1 86 15.5 20.7 523914 5458915 10-Aug-01 247 S DE 2 90 11.8 14.8 523982 5458963 10-Aug-01 248 S DE 2 96 8.9 12.8 523991 5459252 15-Aug-01 249 D DW 2 60 15.5 23.5 522295 5456897 15-Aug-01 250 S DW 2 96 2.0 14.9 522266 5456265 15-Aug-01 251 S DW 2 99 5.3 6.4 522383 5456580 15-Aug-01 252 D DW 1 101 16.2 18.9 522405 5457355 15-Aug-01 253 S DW 1 60 12.2 15.0 522577 5457275 15-Aug-01 254 S DW 2 62 5.2 10.8 522731 5457695 15-Aug-01 255 D DW 2 90 19.4 25.1 522542 5457615 15-Aug-01 256 D DW 2 100 15.1 24.3 522296 5457026 16-Aug-01 257 S DE 2 60 6.6 14.2 523982 5458996 16-Aug-01 258 D DE 1 60 15.0 19.0 523963 5458834 16-Aug-01 259 S DE 2 68 7.0 12.5 524052 5458623 16-Aug-01 260 D DE 2 92 15.0 18.5 523966 5458449 16-Aug-01 261 S DE 1 66 6.6 12.5 524030 5459494 16-Aug-01 262 D DE 2 71 15.0 19.9 524000 5459630 16-Aug-01 263 S DE 2 70 7.0 9.1 523812 5458204 16-Aug-01 264 D DE 2 71 16.0 20.0 523683 5458212 22-Aug-01 265 S R-1 2 68 4.9 5.3 522972 5455324 22-Aug-01 266 S R-1 2 68 8.0 8.3 522922 5454641 22-Aug-01 267 D R-1 2 68 15.0 19.8 522680 5453937 22-Aug-01 268 S R-1 2 70 8.0 12.4 522784 5453077 22-Aug-01 269 D R-1 2 68 15.0 18.0 523373 5452245 22-Aug-01 270 D R-1 2 76 15.4 18.0 523719 5452199 Net Wreck/ Don't use for data 22-Aug-01 271 D R-1 2 75 15.1 18.0 523884 5452088 22-Aug-01 272 S R-1 2 79 11.9 14.9 524186 5451450 22-Aug-01 273 D R-1 2 60 15.0 17.0 524490 5451130 22-Aug-01 274 S R-1 2 62 12.7 14.7 524907 5450840 22-Aug-01 275 D R-1 2 63 15.2 25.2 525031 5450291 22-Aug-01 276 S R-1 2 68 6.4 14.5 524981 5449561 23-Aug-01 277 S R-2 2 60 1.0 6.1 524361 5455284 23-Aug-01 278 S R-2 2 68 2.3 7.7 524585 5455409 23-Aug-01 279 S R-2 2 66 2.5 7.0 525240 5455679 23-Aug-01 280 S R-2 1 72 4.0 7.2 525504 5456559




23-Aug-01 281 S R-2 1 60 2.1 4.0 524410 5454363 23-Aug-01 282 S R-2 2 61 3.2 4.8 524515 5453641 23-Aug-01 283 S R-2 2 69 1.8 3.9 524722 5452850 23-Aug-01 284 S R-2 2 78 2.1 3.4 525222 5451965 23-Aug-01 285 S R-2 2 64 1.0 4.3 526204 5450834 23-Aug-01 286 S R-2 2 67 2.9 4.0 526628 5450033 23-Aug-01 287 S R-2 2 74 2.7 4.5 526867 5449230 23-Aug-01 288 S R-2 1 75 3.4 5.7 526920 5448363 24-Aug-01 289 D R-4 1 60 15.4 21.5 529002 5444083 24-Aug-01 290 S R-4 2 60 8.0 10.8 529457 5444184 24-Aug-01 291 D R-4 2 60 18.8 24.4 530337 5444119 24-Aug-01 292 D R-4 2 64 16.2 20.1 530379 5444023 24-Aug-01 293 S R-4 2 63 7.3 11.0 530056 5443602 24-Aug-01 294 D R-4 2 66 17.5 23.2 529675 5443352 24-Aug-01 295 S R-4 2 71 8.7 9.8 529671 5442875 24-Aug-01 296 D R-4 1 74 16.1 22.3 530263 5442261 30-Aug-01 297 D R-4 2 61 15.9 22.0 530239 5436773 30-Aug-01 298 D R-4 1 60 15.1 16.8 529574 5437403 30-Aug-01 299 S R-4 2 63 8.0 8.7 529870 5438705 30-Aug-01 300 S R-4 2 66 6.2 7.8 530603 5440775 30-Aug-01 301 D R-1 2 61 15.4 25.6 525142 5449072 30-Aug-01 302 S R-1 2 64 6.7 17.3 525039 5449486 30-Aug-01 303 S R-1 1 65 15.0 17.0 525001 5449986 30-Aug-01 304 S R-1 2 68 5.6 15.5 524988 5449726 31-Aug-01 305 S R-3 2 62 12.5 12.8 526040 5448537 31-Aug-01 306 D R-3 1 63 15.2 19.8 526322 5448114 31-Aug-01 307 S R-3 2 66 12.4 13.0 527247 5448247 31-Aug-01 308 D R-3 2 68 21.6 24.0 528201 5448514 31-Aug-01 309 D R-3 2 60 22.3 26.6 528225 5448380 31-Aug-01 310 S R-3 2 73 8.0 12.9 528103 5447629 31-Aug-01 311 D R-3 1 78 16.9 18.9 528131 5447071 31-Aug-01 312 S R-3 2 78 13.2 14.6 528683 5446885 05-Sep-01 313 D R-3 1 70 15.1 17.1 528891 544319 05-Sep-01 314 S R-3 2 76 5.7 11.1 528947 5445175 05-Sep-01 315 S R-3 2 77 10.2 13.3 529440 5446041




05-Sep-01 316 D R-3 2 81 16.5 23.7 529955 5446725 06-Sep-01 317 D R-5 2 60 15.9 23.6 532942 5432817 06-Sep-01 318 S R-5 2 72 7.7 9.0 533211 5433291 06-Sep-01 319 S R-5 1 73 9.2 10.8 533497 5433899 06-Sep-01 320 D R-5 2 77 15.2 22.9 533597 5434490 06-Sep-01 321 S R-5 2 62 11.0 12.5 532834 5434557 06-Sep-01 322 D R-5 1 63 15.0 19.0 532050 5434705 06-Sep-01 323 S R-5 2 69 7.5 13.0 531875 5435260 06-Sep-01 324 D R-5 2 70 15.0 16.8 531692 5435908 06-Sep-01 325 S R-5 2 61 10.4 14.0 531751 5436419 06-Sep-01 326 D R-5 2 64 15.4 20.1 531874 5437234 06-Sep-01 327 D R-5 1 73 15.1 20.2 531298 5437575 06-Sep-01 328 S R-5 2 79 4.4 8.8 530727 5436901 07-Sep-01 329 S R-6 2 61 6.0 11.5 536353 5427659 07-Sep-01 330 D R-6 1 63 15.0 15.8 536214 5428568 07-Sep-01 331 S R-6 2 64 10.0 13.0 535488 5430025 07-Sep-01 332 D R-6 2 68 15.5 17.1 534927 5430150 07-Sep-01 333 D R-6 2 62 15.7 21.5 533842 5430889 07-Sep-01 334 S R-6 2 80 6.8 7.7 533992 5431043 07-Sep-01 335 S R-6 1 81 9.2 12.5 534712 5431396 07-Sep-01 336 D R-6 2 83 24.7 28.2 535226 5431596 07-Sep-01 337 S R-6 2 64 8.4 10.7 534915 5432174 07-Sep-01 338 D R-6 1 70 23.0 25.3 534693 5432809 07-Sep-01 339 D R-6 2 76 18.3 24.2 534517 5432719 07-Sep-01 340 S R-6 2 103 10.6 13.6 534100 5432478

1 For stratum ID, see Figure 2. 2 For locations see Figure 3.


Appendix B. Capture information from juvenile sturgeon captured in 2001. Set Length (mm) Weight Scute Mark New

Date ID1 Fork Total (g) L# R# Pit Tag # Pit Tag# Comments

10-Jul-01 85 232 256 80 9 9 424062446A 10-Jul-01 85 210 248 66 10 9 423D477D43 Partial Left Scute Removal (Possibly 9L) 10-Jul-01 87 270 305 100 10 9 4240432B58 Partial Left Scute Removal 10-Jul-01 87 209 241 50 9 - 4242517365 10-Jul-01 87 259 300 85 11 9 4240295451 10-Jul-01 90 272 322 115 9 9 42404F544C 10-Jul-01 95 190 220 45 10 10 4240006B33 10-Jul-01 96 264 305 110 10 10 42401A6733 11-Jul-01 101 216 247 60 9 9 42400E381F 11-Jul-01 101 316 365 140 10 11 423D2A6B2A 11-Jul-01 101 260 315 110 9 9 423D3B015A 11-Jul-01 105 250 297 100 10 10 42404A1114 11-Jul-01 106 240 279 90 9 10 424010777D 12-Jul-01 111 295 344 155 11 10 42402C3B78 12-Jul-01 111 273 333 125 10 10 4240393564 12-Jul-01 113 305 364 175 11 9 4240296B67 12-Jul-01 114 245 289 90 9 9 423E4D7A6D 12-Jul-01 114 336 390 205 9 10 423D29612B 12-Jul-01 114 330 386 195 9 8 423D312747 12-Jul-01 114 314 361 175 9 9 423D4A5836 19-Jul-01 165 665 761 1950 2 - 7F7D27374C Previous left fin ray clip 31-Jul-01 192 305 355 155 10 9 423D3B1F4C 31-Jul-01 192 285 331 132 10 10 423D403A48 1-Aug-01 194 345 402 230 10 12 423D321D3B 1-Aug-01 194 290 335 130 10 9 423D387F45 1-Aug-01 202 295 341 140 9 10 423D532756 2-Aug-01 205 269 310 110 9 9 423F5F577E 2-Aug-01 206 266 320 110 9 9 423D324D3C Skinny Fish 2-Aug-01 208 245 287 85 10 10 423D223F60 Partial Scute Removal 2-Aug-01 208 258 301 100 10 10 - - Shed pit tag/ released before re-tagged 7-Aug-01 213 225 251 65 10 11 423E53580A 7-Aug-01 215 255 300 95 9 9 42404F2A20 7-Aug-01 216 274 320 115 9 9 423E25220D 7-Aug-01 216 266 303 100 10 9 423D451021 Healed anal fin deformation 7-Aug-01 216 257 297 98 9 9 423E347B17 small displaced scute on left


Set Length (mm) Weight Scute Mark New


7-Aug-01 219 300 353 145 10 9 423D354426 7-Aug-01 219 300 340 150 10 11 423D555F7F 7-Aug-01 219 254 296 90 11 10 42404C1565 7-Aug-01 219 310 360 165 10 10 4240324B2C 7-Aug-01 219 261 306 113 9 9 423E256579 8-Aug-01 221 250 292 85 11 12 42403C174B 8-Aug-01 221 239 265 70 10 9 4240255B41 8-Aug-01 221 230 266 65 10 10 423F7A1126 8-Aug-01 222 342 395 195 9 11 423D46721C 8-Aug-01 224 214 247 60 9 10 42401E7E24 8-Aug-01 226 278 325 120 9 10 42401B1F65 Double scutes counted as one 8-Aug-01 227 270 315 110 10 9 - 7F7D3F3F5A Shed pit tag/ scar at old tag location 9-Aug-01 232 299 346 163 9 9 423D557F7C 9-Aug-01 233 305 357 160 11 11 42402B6C0D 9-Aug-01 233 283 327 110 9 9 423D4D5415 Partial scute removal - removed the rest 9-Aug-01 237 273 320 100 10 9 423D42605A 9-Aug-01 240 330 383 185 10 10 4240207625 9-Aug-01 240 345 400 215 10 10 4240213648 9-Aug-01 240 283 335 115 9 8 423D5E040D

15-Aug-01 249 440 513 530 9 5 504E6D181C Sonic Tagged with tag # 828 / Frequency 72 khz 15-Aug-01 254 520 600 830 9 6 504F6C7F1B Dorsal Fin Split/ Sonic Tagged with tag # 832 / Frequency 74 khz 16-Aug-01 259 705 805 2230 9 3 7F7D424B72 Sonic Tagged with tag # 837 / Frequency 76 khz/External scute drill method 16-Aug-01 264 555 653 1130 9 5 504D1E7F11 Split caudal fin 24-Aug-01 292 334 384 205 10 10 423D455E30 24-Aug-01 296 336 377 285 10 9 423D20250B Partial left scute removal 30-Aug-01 298 325 377 205 10 10 423D2C1852 31-Aug-01 309 240 272 75 11 11 - 7F7D3F3734 Small Scute on right not counted/ New tag aplied 31-Aug-01 309 335 390 215 9 8 42402C4D52 Some eye damage (Cateracts?) possibly current or past net damage 5-Sep-01 315 335 390 215 10 9 4240383A3B Torn right pectoral fin 5-Sep-01 316 342 397 190 10 10 423D281D67 6-Sep-01 317 316 370 175 10 9 4240510C5D 6-Sep-01 317 350 403 210 9 10 42401F6E4E 6-Sep-01 317 258 302 100 10 10 42403E1215 R10 Scute almost entirely regrown 6-Sep-01 317 307 362 145 10 9 4240226B43 6-Sep-01 320 340 378 185 9 9 423D5A5406


Set Length (mm) Weight Scute Mark New


6-Sep-01 320 285 332 130 9 9 415E2F4955 6-Sep-01 320 288 348 120 9 9 42402F2024 6-Sep-01 322 290 340 150 10 10 423D31673E 6-Sep-01 322 275 320 120 9 11 4240494805 6-Sep-01 326 345 398 190 10 9 4240245230 6-Sep-01 326 276 323 115 10 9 423D1B7C36 6-Sep-01 326 253 296 185 9 9 423F5D137A 7-Sep-01 330 235 266 75 10 11 423E53580A 7-Sep-01 332 276 320 110 9 9 423E347B17 7-Sep-01 333 270 312 100 10 10 423D5B365C R10 Partial scute removal/ Cloudy eyes (result of net trauma?) 7-Sep-01 333 245 285 90 11 10 42401B1600 7-Sep-01 333 370 435 260 10 10 423D256936 7-Sep-01 336 236 276 75 10 11 423E1F1536 7-Sep-01 336 262 304 97 8 9 423E3E7A04 Pit tag visable 7-Sep-01 336 390 442 315 9 11 4240526531 7-Sep-01 337 235 273 85 9 10 42401E7E24 7-Sep-01 338 285 340 130 9 10 4240221135 7-Sep-01 338 246 294 95 10 9 4240241249 7-Sep-01 339 322 380 180 10 10 423D202323 7-Sep-01 339 275 315 120 9 10 42401B4A5B 7-Sep-01 339 282 326 125 10 10 423D367957 7-Sep-01 339 308 360 155 10 10 423D5A476F 7-Sep-01 339 300 350 145 9 9 423E3D483E 7-Sep-01 339 280 320 115 10 9 423D4B4A68 7-Sep-01 339 280 324 115 10 10 - 7F7D3E1804 Pit Tag Loss/ small scar on side possibly tag loss location 7-Sep-01 339 285 335 135 10 10 - 7F7D3F6742 Pit Tag Loss 7-Sep-01 340 290 345 145 9 10 423D312573 7-Sep-01 320 405 225 9 8 423D53360B Fish Angled at E-535274 N-5431636 / Worm like markings on left side

1 For set information see appendix A.


Appendix C. Summary of sturgeon recapture and life history information. Fish ID 2001 Data Days Fish

Database PIT tag 2001 Release or at History FL(cm) TL(cm) Growth #1

# recp. date last Capture Large Age Family Prev. Current Prev. Current Prev. Current Wr (%) Change(%) FL(cm/yr) TL (cm/yr) Mass(g/yr)7575 424062446A 10-Jul-01 28-Sep-00 285 2 BC163 20.5 23.2 24.0 25.6 0.06 0.08 115 14 3.46 2.05 29.57818 423D477D43 10-Jul-01 28-Sep-00 285 2 BC163 19.5 21.0 23.0 24.8 0.05 0.07 105 1 1.92 2.31 19.27493 4240432B58 10-Jul-01 28-Sep-00 285 2 BC196 24.0 27.0 28.5 30.5 0.09 0.10 82 -11 3.84 2.56 11.57344 4242517365 10-Jul-01 28-Sep-00 285 2 BC196 17.0 20.9 20.5 24.1 0.03 0.05 87 -7 4.99 4.61 23.19119 4240295451 10-Jul-01 19-Apr-01 82 2 BC168 22.5 25.9 27.0 30.0 0.07 0.09 73 -11 15.13 13.35 67.79557 42404F544C 10-Jul-01 19-Apr-01 82 2 BC168 25.0 27.2 30.0 32.2 0.10 0.12 79 -11 9.79 9.79 45.87367 4240006B33 10-Jul-01 28-Sep-00 285 2 BC196 17.0 19.0 20.0 22.0 0.04 0.05 106 -9 2.56 2.56 11.59451 42401A6733 10-Jul-01 19-Apr-01 82 2 BC168 24.5 26.4 29.0 30.5 0.10 0.11 90 -2 8.46 6.68 64.17387 42400E381F 11-Jul-01 28-Sep-00 286 2 BC196 19.5 21.6 22.5 24.7 0.05 0.06 97 -4 2.68 2.81 17.99230 423D2A6B2A 11-Jul-01 19-Apr-01 83 2 BC168 28.0 31.6 33.5 36.5 0.15 0.14 64 -24 15.83 13.19 -29.59277 423D3B015A 11-Jul-01 19-Apr-01 83 2 BC168 24.5 26.0 30.0 31.5 0.10 0.11 81 -5 6.60 6.60 44.99537 42404A1114 11-Jul-01 19-Apr-01 83 2 BC168 22.5 25.0 27.0 29.7 0.07 0.10 89 3 10.99 11.87 129.37309 424010777D 11-Jul-01 28-Sep-00 286 2 BC196 21.0 24.0 25.0 27.9 0.06 0.09 98 0 3.83 3.70 34.59013 42402C3B78 12-Jul-01 19-Apr-01 84 2 BC197 27.5 29.5 32.0 34.4 0.15 0.16 86 -17 8.69 10.43 36.99128 4240393564 12-Jul-01 19-Apr-01 84 2 BC168 25.5 27.3 30.5 33.3 0.11 0.13 77 -10 7.82 12.17 80.09486 4240296B67 12-Jul-01 19-Apr-01 84 2 BC168 28.0 30.5 34.5 36.4 0.18 0.18 81 -16 10.86 8.26 -9.69417 423E4D7A6D 12-Jul-01 19-Apr-01 84 2 BC168 22.0 24.5 26.0 28.9 0.07 0.09 88 -2 10.86 12.60 106.08619 423D29612B 12-Jul-01 19-Apr-01 84 2 BC197 31.0 33.6 36.5 39.0 0.20 0.21 76 -18 11.30 10.86 3.08672 423D312747 12-Jul-01 19-Apr-01 84 2 BC197 31.0 33.0 36.5 38.6 0.21 0.20 74 -22 8.69 9.13 -68.78843 423D4A5836 12-Jul-01 19-Apr-01 84 2 BC197 29.0 31.4 34.0 36.1 0.18 0.18 83 -20 10.43 9.13 -13.95702 7F7D27374C 19-Jul-01 21-Aug-00 332 11 65.2 66.5 76.0 76.1 2.00 1.95 83 -2 1.43 0.11 -55.08743 423D3B1F4C 31-Jul-01 19-Apr-01 103 2 BC197 28.5 30.5 33.5 35.5 0.17 0.16 78 -23 7.09 7.09 -43.28777 423D403A48 31-Jul-01 19-Apr-01 103 2 BC197 26.0 28.5 30.0 33.1 0.12 0.13 83 -22 8.86 10.99 38.38677 423D321D3B 01-Aug-01 19-Apr-01 104 2 BC197 31.0 34.5 37.0 40.2 0.23 0.23 77 -23 12.28 11.23 1.88730 423D387F45 01-Aug-01 19-Apr-01 104 2 BC197 26.5 29.0 30.5 33.5 0.12 0.13 78 -17 8.77 10.53 46.78901 423D532756 01-Aug-01 19-Apr-01 104 2 BC197 26.0 29.5 30.0 34.1 0.12 0.14 80 -20 12.28 14.39 86.77739 423D324D3C 02-Aug-01 28-Sep-00 308 2 BC163 23.5 26.6 27.0 32.0 0.08 0.11 77 -25 3.67 5.93 30.87660 423D223F60 02-Aug-01 28-Sep-00 308 2 BC163 19.0 24.5 22.5 28.7 0.05 0.09 85 -27 6.52 7.35 40.37407 423E53580A 07-Aug-01 28-Sep-00 313 2 BC196 19.5 22.5 22.0 25.1 0.05 0.07 100 -13 3.50 3.62 19.89556 42404F2A20 07-Aug-01 19-Apr-01 110 2 BC168 22.0 25.5 26.5 30.0 0.07 0.10 82 -11 11.61 11.61 76.39303 423D451021 07-Aug-01 19-Apr-01 110 2 BC168 23.0 26.6 27.5 30.3 0.07 0.10 83 0 11.95 9.29 89.69393 423E347B17 07-Aug-01 19-Apr-01 110 2 BC168 23.0 25.7 27.0 29.7 0.08 0.10 87 -6 8.96 8.96 69.79265 423D354426 07-Aug-01 19-Apr-01 110 2 BC168 26.5 30.0 32.0 35.3 0.12 0.15 74 -7 11.61 10.95 96.29346 423D555F7F 07-Aug-01 19-Apr-01 110 2 BC168 26.5 30.0 31.0 34.0 0.12 0.15 86 -5 11.61 9.95 105.9

Relative WeightWT(kg)Recapture Information


Fish ID 2001 Data Days FishDatabase PIT tag 2001 Release or at History FL(cm) TL(cm) Growth

#1# recp. date last Capture Large Age Family Prev. Current Prev. Current Prev. Current Wr (%) Change(%) FL(cm/yr) TL (cm/yr) Mass(g/yr)

7300 42404C1565 07-Aug-01 28-Sep-00 313 2 BC196 22.0 25.4 26.0 29.6 0.06 0.09 81 -7 3.96 4.20 30.39029 4240324B2C 07-Aug-01 19-Apr-01 110 2 BC197 27.5 31.0 33.0 36.0 0.14 0.17 79 -12 11.61 9.95 70.39372 423E256579 07-Aug-01 19-Apr-01 110 2 BC168 22.5 26.1 27.0 30.6 0.08 0.11 91 -3 11.95 11.95 116.87314 42403C174B 08-Aug-01 28-Sep-00 314 2 BC196 20.5 25.0 24.5 29.2 0.06 0.09 80 -23 5.23 5.46 26.79479 4240255B41 08-Aug-01 19-Apr-01 111 2 BC168 19.5 23.9 23.0 26.5 0.05 0.07 90 -5 14.47 11.51 77.37336 423F7A1126 08-Aug-01 28-Sep-00 314 2 BC196 20.0 23.0 23.5 26.6 0.05 0.07 83 -18 3.49 3.60 13.98814 423D46721C 08-Aug-01 19-Apr-01 111 2 BC197 31.0 34.2 36.0 39.5 0.18 0.20 69 -15 10.52 11.51 64.17431 42401E7E24 08-Aug-01 28-Sep-00 314 2 BC196 18.5 21.4 21.0 24.7 0.04 0.06 97 -4 3.37 4.30 26.79453 42401B1F65 08-Aug-01 19-Apr-01 111 2 BC168 24.0 27.8 29.0 32.5 0.09 0.12 80 -8 12.50 11.51 93.78009 423D557F7C 09-Aug-01 19-Apr-01 112 2 BC163 25.5 29.9 30.0 34.6 0.13 0.16 89 -26 14.34 14.99 98.79011 42402B6C0D 09-Aug-01 19-Apr-01 112 2 BC197 28.0 30.5 33.0 35.7 0.15 0.16 79 -17 8.15 8.80 27.77325 423D4D5415 09-Aug-01 28-Sep-00 315 2 BC196 23.5 28.3 27.5 32.7 0.09 0.11 72 -25 5.56 6.03 29.07626 423D42605A 09-Aug-01 28-Sep-00 315 2 BC163 23.0 27.3 26.5 32.0 0.08 0.10 70 -38 4.98 6.37 18.58502 4240207625 09-Aug-01 19-Apr-01 112 2 BC197 29.5 33.0 35.0 38.3 0.19 0.19 72 -25 11.41 10.75 -4.98503 4240213648 09-Aug-01 19-Apr-01 112 2 BC197 31.0 34.5 36.0 40.0 0.22 0.22 73 -33 11.41 13.04 -20.99361 423D5E040D 09-Aug-01 19-Apr-01 112 2 BC168 26.0 28.3 31.0 33.5 0.12 0.12 69 -26 7.50 8.15 -25.14453 504E6D181C 15-Aug-01 05-Aug-99 741 6 31 32.0 44.0 38.0 51.3 0.20 0.53 81 0 5.91 6.55 162.64664 504F6C7F1B 15-Aug-01 12-Aug-99 734 6 31 39.0 52.0 45.0 60.0 0.30 0.83 76 6 6.46 7.46 263.63173 7F7D424B72 16-Aug-01 16-Aug-95 2192 9 42.0 70.5 49.0 80.5 - - - - 4.75 5.25 -3339 504D1E7F11 16-Aug-01 06-Oct-97 1410 6 34 28.3 55.5 32.6 65.3 0.11 1.13 79 5 7.04 8.46 263.48804 423D455E30 24-Aug-01 19-Apr-01 127 2 BC197 30.0 33.4 34.5 38.4 0.17 0.21 80 -12 9.77 11.21 112.17203 423D20250B 24-Aug-01 27-Sep-00 331 2 BC197 27.5 33.6 32.0 37.7 0.13 0.29 117 25 6.73 6.29 168.79236 423D2C1852 30-Aug-01 19-Apr-01 133 2 BC168 28.5 32.5 33.5 37.7 0.16 0.21 84 -10 10.98 11.53 133.79014 42402C4D52 31-Aug-01 19-Apr-01 134 2 BC197 29.5 33.5 34.0 39.0 0.17 0.22 79 -18 10.90 13.62 123.99039 4240383A3B 05-Sep-01 19-Apr-01 139 2 BC197 29.0 33.5 34.5 39.0 0.18 0.22 79 -18 11.82 11.82 97.28610 423D281D67 05-Sep-01 19-Apr-01 139 2 BC197 29.5 34.2 34.5 39.7 0.16 0.19 66 -22 12.34 13.65 74.89561 4240510C5D 06-Sep-01 19-Apr-01 140 2 BC168 27.0 31.6 31.5 37.0 0.13 0.18 77 -16 11.99 14.34 129.68991 42401F6E4E 06-Sep-01 19-Apr-01 140 2 BC197 28.5 35.0 33.5 40.3 0.16 0.21 70 -28 16.95 17.73 124.67719 42403E1215 06-Sep-01 28-Sep-00 343 2 BC163 19.0 25.8 22.0 30.2 0.05 0.10 84 -26 7.24 8.73 56.47754 4240226B43 06-Sep-01 28-Sep-00 343 2 BC163 23.0 30.7 27.5 36.2 0.08 0.15 68 -24 8.19 9.26 68.18950 423D5A5406 06-Sep-01 19-Apr-01 140 2 BC197 27.0 34.0 31.5 37.8 0.14 0.19 76 -29 18.25 16.43 110.89150 415E2F4955 06-Sep-01 19-Apr-01 140 2 BC168 22.0 28.5 26.5 33.2 0.07 0.13 81 -14 16.95 17.47 146.89495 42402F2024 06-Sep-01 19-Apr-01 140 2 BC168 23.0 28.8 27.5 34.8 0.12 0.12 64 -70 15.12 19.03 6.39254 423D31673E 06-Sep-01 19-Apr-01 140 2 BC168 24.0 29.0 28.5 34.0 0.10 0.15 86 -13 13.04 14.34 135.67741 4240494805 06-Sep-01 28-Sep-00 343 2 BC163 20.5 27.5 24.0 32.0 0.06 0.12 84 -28 7.45 8.51 60.7

Recapture InformationWT(kg) Relative Weight


Fish ID 2001 Data Days FishDatabase PIT tag 2001 Release or at History FL(cm) TL(cm) Growth

#1# recp. date last Capture Large Age Family Prev. Current Prev. Current Prev. Current Wr (%) Change(%) FL(cm/yr) TL (cm/yr) Mass(g/yr)

8510 4240245230 06-Sep-01 19-Apr-01 140 2 BC197 30.0 34.5 34.0 39.8 0.16 0.19 66 -24 11.73 15.12 86.87302 423D1B7C36 06-Sep-01 28-Sep-00 343 2 BC196 21.5 27.6 25.5 32.3 0.07 0.12 78 -22 6.49 7.24 49.07474 423F5D137A 06-Sep-01 28-Sep-00 343 2 BC196 19.0 25.3 22.0 29.6 0.04 0.19 167 66 6.70 8.09 151.17407 423E53580A 07-Sep-01 28-Sep-00 344 2 BC196 19.5 23.5 22.0 26.6 0.05 0.08 95 -17 4.24 4.88 28.69393 423E347B17 07-Sep-01 19-Apr-01 31 2 BC168 25.7 27.6 29.7 32.0 0.10 0.11 77 -10 22.37 27.08 141.37653 423D5B365C 07-Sep-01 28-Sep-00 344 2 BC163 20.5 27.0 24.0 31.2 0.05 0.10 76 -13 6.90 7.64 53.17870 42401B1600 07-Sep-01 28-Sep-00 344 2 BC163 20.0 24.5 23.0 28.5 0.06 0.09 92 -30 4.77 5.84 31.88590 423D256936 07-Sep-01 19-Apr-01 141 2 BC197 33.0 37.0 39.0 43.5 0.23 0.26 67 -18 10.35 11.65 70.77391 423E1F1536 07-Sep-01 28-Sep-00 344 2 BC196 18.0 23.6 21.5 27.6 0.04 0.08 85 -11 5.94 6.47 39.39404 423E3E7A04 07-Sep-01 19-Apr-01 141 2 BC168 20.5 26.2 24.0 30.4 0.05 0.10 80 -9 14.76 16.57 120.68539 4240526531 07-Sep-01 19-Apr-01 141 2 BC197 33.3 39.0 38.0 44.2 0.28 0.32 78 -35 14.76 16.05 91.97431 42401E7E24 07-Sep-01 28-Sep-00 344 2 BC196 18.5 23.5 21.0 27.3 0.04 0.09 99 -2 5.31 6.68 50.97834 4240221135 07-Sep-01 28-Sep-00 344 2 BC163 22.5 28.5 26.0 34.0 0.07 0.13 75 -18 6.37 8.49 65.87672 4240241249 07-Sep-01 28-Sep-00 344 2 BC163 20.0 24.6 23.5 29.4 0.05 0.10 87 -11 4.88 6.26 45.67590 42401B4A5B 07-Sep-01 28-Sep-00 344 2 BC163 20.5 27.5 24.0 31.5 0.06 0.12 88 -14 7.43 7.96 65.87550 423D367957 07-Sep-01 28-Sep-00 344 2 BC163 19.0 28.2 22.5 32.6 0.05 0.13 82 -25 9.76 10.72 80.69356 423D5A476F 07-Sep-01 19-Apr-01 141 2 BC168 25.5 30.8 30.0 36.0 0.10 0.16 74 -15 13.72 15.53 134.49403 423E3D483E 07-Sep-01 19-Apr-01 141 2 BC168 24.0 30.0 28.5 35.0 0.10 0.15 76 -23 15.53 16.83 123.09321 423D4B4A68 07-Sep-01 19-Apr-01 141 2 BC168 22.0 28.0 26.0 32.0 0.07 0.12 80 -15 15.53 15.53 116.77821 423D312573 07-Sep-01 28-Sep-00 344 2 BC163 23.5 29.0 28.5 34.5 0.10 0.15 80 -24 5.84 6.37 45.6

Recapture InformationWT(kg) Relative Weight

1 Identification number from the Idaho Fish and Game database..


Appendix D. Summary of adult sturgeon capture data. Set Length (mm) Weight Scutes New

Date ID1 Fork Total (lb) L# R# Pit Tag # Pit Tag# Comments

05-Jul-01 84 2000+ Escaped at boat. Bloated stomach, skin air blisters, etc, but swam away. 17-Jul-01 145 1400+ Lost at the boat. No Data 07-Aug-01 Angled 1495 1690 62 - - - 7F7D3E2051 Possible left fin ray clip. Put in pit tag / Removed L2 scute 10-Aug-01 245 1615 1820 60 2 - 7F7D417F1D Brown floy tag (KT00147), Surgery Scar, L2 scute

1 For set information see appendix A.


Appendix E. Summary of incidental gill net catch, 2001. Capture Set ID Length Capture Set ID Length

Date Number1 Spp2 (mm)3 Date Number1 Spp2 (mm)3

19-Jun-01 11 PMC 225 03-Jul-01 50 PMC 127 19-Jun-01 13 WF 235 03-Jul-01 50 PMC 130 19-Jun-01 13 WF 240 03-Jul-01 50 PMC 110 19-Jun-01 13 WF 252 03-Jul-01 50 YP 97 19-Jun-01 13 LNS 422 03-Jul-01 50 YP 95 20-Jun-01 15 PMC 230 03-Jul-01 51 WF 245 20-Jun-01 19 PMC 131 03-Jul-01 51 PMC 227 20-Jun-01 20 LNS 219 03-Jul-01 51 YP 185 21-Jun-01 30 NPM 240 03-Jul-01 51 YP 190 21-Jun-01 30 WF 290 03-Jul-01 52 YP 215 21-Jun-01 30 PMC 235 03-Jul-01 52 YP 220 21-Jun-01 31 RSS 98 03-Jul-01 52 YP 200 21-Jun-01 31 RSS 90 03-Jul-01 52 YP 160 21-Jun-01 31 RSS 93 03-Jul-01 53 PMC 238 21-Jun-01 32 WF 240 03-Jul-01 53 PMC 283 21-Jun-01 33 NPM 218 03-Jul-01 53 LSS 227 21-Jun-01 33 WF 222 03-Jul-01 54 PMC 230 21-Jun-01 33 NPM 225 03-Jul-01 54 WF 220 21-Jun-01 34 PMC 210 03-Jul-01 55 Catfish 155 21-Jun-01 34 PMC 235 03-Jul-01 55 YP 165 21-Jun-01 34 PMC 275 03-Jul-01 55 LSS 223 21-Jun-01 35 PMC 240 04-Jul-01 61 LNS 265 21-Jun-01 35 NPM 220 04-Jul-01 62 WF 235 21-Jun-01 35 NPM 246 04-Jul-01 62 PMC 236 21-Jun-01 35 WF 220 04-Jul-01 63 WF 123 21-Jun-01 35 WF 215 04-Jul-01 64 PMC 280 21-Jun-01 37 PMC 215 04-Jul-01 64 PMC 228 21-Jun-01 37 PMC 220 04-Jul-01 64 PMC 235 21-Jun-01 38 NPM 255 04-Jul-01 64 PMC 251 21-Jun-01 38 PMC 230 04-Jul-01 64 PMC 230 21-Jun-01 38 LNS 230 04-Jul-01 71 PMC 250 21-Jun-01 38 PMC 232 04-Jul-01 71 PMC 230 21-Jun-01 41 WF 284 04-Jul-01 71 PMC 220 21-Jun-01 41 PMC 240 04-Jul-01 72 PMC 250 21-Jun-01 41 PMC 215 04-Jul-01 72 PMC 230 21-Jun-01 41 PMC 226 04-Jul-01 72 PMC 247 21-Jun-01 41 PMC 253 04-Jul-01 72 PMC 241 21-Jun-01 41 PMC 220 04-Jul-01 72 PMC 243 21-Jun-01 41 PMC 214 04-Jul-01 72 PMC 245 21-Jun-01 41 PMC 230 05-Jul-01 74 LNS 222 21-Jun-01 41 PMC 225 05-Jul-01 74 LNS 240 21-Jun-01 41 PMC 210 05-Jul-01 74 LSS 235 22-Jun-01 42 PMC 120 05-Jul-01 74 LNS 215 22-Jun-01 42 PMC 136 05-Jul-01 76 PMC 236 22-Jun-01 43 LSS 240 05-Jul-01 76 PMC 223 22-Jun-01 49 PMC 116 05-Jul-01 76 PMC 219 22-Jun-01 49 PMC 118 05-Jul-01 76 PMC 245 22-Jun-01 49 PMC 121 05-Jul-01 76 NPM 270 03-Jul-01 50 PMC 130 05-Jul-01 76 NPM 286 03-Jul-01 50 PMC 125 05-Jul-01 76 WF 226


Capture Set ID Length Capture Set ID Length


05-Jul-01 82 LNS 290 16-Jul-01 136 YP 101 05-Jul-01 82 PMC 225 16-Jul-01 136 YP 97 10-Jul-01 87 LNS 230 16-Jul-01 136 YP 178 10-Jul-01 87 LSS 420 16-Jul-01 136 NPM 130 10-Jul-01 91 RSS 105 16-Jul-01 136 PMC 132 11-Jul-01 97 WF 265 16-Jul-01 136 YP 110 11-Jul-01 97 NPM 260 16-Jul-01 136 PMC 130 11-Jul-01 97 NPM 230 16-Jul-01 136 PMC 125 11-Jul-01 97 NPM 239 17-Jul-01 137 NPM 240 11-Jul-01 97 PMC 241 17-Jul-01 138 PMC 140 11-Jul-01 98 RSS 105 17-Jul-01 138 PMC 120 11-Jul-01 99 LNS 230 17-Jul-01 138 RSS 105 12-Jul-01 109 WF 250 17-Jul-01 138 RSS 102 12-Jul-01 109 LNS 232 17-Jul-01 138 YP 103 12-Jul-01 112 LNS 255 17-Jul-01 139 PMC 238 12-Jul-01 112 PMC 265 17-Jul-01 139 PMC 245 12-Jul-01 113 WF 255 17-Jul-01 139 WF 235 12-Jul-01 116 LNS 310 17-Jul-01 139 WF 230 12-Jul-01 118 WF 240 17-Jul-01 140 LNS 317 12-Jul-01 118 PMC 220 17-Jul-01 141 LNS 380 12-Jul-01 120 PMC 225 17-Jul-01 141 WF 253 13-Jul-01 124 RSS 115 17-Jul-01 141 WF 240 13-Jul-01 124 RSS 123 17-Jul-01 144 WF 260 13-Jul-01 124 RSS 114 17-Jul-01 145 WF 270 16-Jul-01 126 WF 295 17-Jul-01 145 WF 254 16-Jul-01 129 PMC 125 17-Jul-01 145 WF 263 16-Jul-01 129 NPM 130 17-Jul-01 145 WF 300 16-Jul-01 130 NPM 250 17-Jul-01 145 WF 258 16-Jul-01 130 WF 235 17-Jul-01 145 WF 302 16-Jul-01 130 WF 230 18-Jul-01 149 WF 245 16-Jul-01 131 WF 225 18-Jul-01 151 WF 235 16-Jul-01 131 WF 225 18-Jul-01 151 WF 246 16-Jul-01 131 NPM 243 18-Jul-01 151 KOK 250 16-Jul-01 132 NPM 265 18-Jul-01 155 PMC 238 16-Jul-01 132 NPM 286 18-Jul-01 155 PMC 228 16-Jul-01 132 WF 235 18-Jul-01 157 WF 288 16-Jul-01 132 WF 215 18-Jul-01 157 WF 284 16-Jul-01 133 PMC 235 18-Jul-01 157 WF 267 16-Jul-01 133 WF 255 19-Jul-01 165 NPM 262 16-Jul-01 133 WF 260 19-Jul-01 166 WF 240 16-Jul-01 133 NPM 245 19-Jul-01 166 WF 237 16-Jul-01 133 WF 215 19-Jul-01 167 PMC 116 16-Jul-01 134 YP 173 19-Jul-01 167 PMC 117 16-Jul-01 134 NPM 250 30-Jul-01 172 NPM 266 16-Jul-01 134 WF 228 30-Jul-01 175 LNS 254 16-Jul-01 135 WF 255 31-Jul-01 181 PMC 130 16-Jul-01 135 WF 224 31-Jul-01 189 PMC 130 16-Jul-01 135 NPM 255 31-Jul-01 190 NPM 240 16-Jul-01 136 YP 110 31-Jul-01 191 NPM 260 16-Jul-01 136 YP 95 31-Jul-01 191 WF 238




31-Jul-01 191 WF 235 15-Aug-01 250 WF 265 01-Aug-01 199 PMC 235 15-Aug-01 250 LNS 345 01-Aug-01 200 LSS 220 15-Aug-01 252 PMC 185 02-Aug-01 207 LNS 230 15-Aug-01 254 WF 380 02-Aug-01 207 PMC 214 15-Aug-01 255 LNS 355 02-Aug-01 209 NPM 130 15-Aug-01 256 WF 245 02-Aug-01 209 NPM 130 15-Aug-01 256 PMC 250 02-Aug-01 209 LNS 115 15-Aug-01 256 PMC 230 02-Aug-01 211 WF 235 15-Aug-01 256 PMC 235 02-Aug-01 211 WF 237 15-Aug-01 256 PMC 222 02-Aug-01 211 NPM 245 15-Aug-01 256 PMC 222 02-Aug-01 211 NPM 251 15-Aug-01 256 PMC 212 02-Aug-01 211 NPM 260 15-Aug-01 256 PMC 224 02-Aug-01 212 NPM 248 16-Aug-01 257 WF 271 02-Aug-01 212 NPM 237 16-Aug-01 259 NPM 384 08-Aug-01 224 LNS 240 16-Aug-01 259 NPM 308 08-Aug-01 224 LNS 235 16-Aug-01 259 NPM 285 08-Aug-01 227 PMC 120 16-Aug-01 259 NPM 285 09-Aug-01 234 RSS 109 16-Aug-01 259 NPM 305 09-Aug-01 235 PMC 220 16-Aug-01 259 WF 272 10-Aug-01 241 PMC 220 16-Aug-01 260 WF 230 10-Aug-01 242 WF 240 16-Aug-01 260 WF 245 10-Aug-01 242 WF 213 16-Aug-01 261 WF 110 10-Aug-01 242 NPM 533 16-Aug-01 262 WF 265 10-Aug-01 244 PMC 235 16-Aug-01 263 WF 285 10-Aug-01 245 PMC 255 16-Aug-01 263 WF 265 10-Aug-01 245 PMC 265 16-Aug-01 263 WF 220 10-Aug-01 245 PMC 245 16-Aug-01 263 NPM 245 10-Aug-01 245 PMC 256 22-Aug-01 268 NPM 255 10-Aug-01 245 PMC 245 22-Aug-01 273 LSS 220 10-Aug-01 245 PMC 285 22-Aug-01 274 LSS 290 10-Aug-01 245 PMC 257 23-Aug-01 277 WF 261 10-Aug-01 245 PMC 247 23-Aug-01 277 NPM 238 10-Aug-01 245 PMC 243 23-Aug-01 277 NPM 246 10-Aug-01 245 PMC 250 23-Aug-01 277 NPM 230 10-Aug-01 245 PMC 229 23-Aug-01 277 YP 185 10-Aug-01 245 PMC 210 23-Aug-01 277 YP 170 10-Aug-01 245 PMC 250 23-Aug-01 277 YP 180 10-Aug-01 245 PMC 241 23-Aug-01 279 WF 215 10-Aug-01 245 PMC 230 23-Aug-01 279 PMC 225 10-Aug-01 245 PMC 232 23-Aug-01 279 NPM 240 10-Aug-01 246 PMC 125 23-Aug-01 279 YP 285 10-Aug-01 246 PMC 200 23-Aug-01 279 YP 203 10-Aug-01 247 WF 245 23-Aug-01 280 PMC 122 10-Aug-01 247 WF 275 23-Aug-01 280 PMC 123 10-Aug-01 247 WF 270 23-Aug-01 281 PMC 120 10-Aug-01 247 WF 309 23-Aug-01 281 RSS 103 10-Aug-01 248 WF 253 23-Aug-01 281 YP 115 10-Aug-01 248 WF 275 23-Aug-01 282 WF 215 10-Aug-01 248 WF 280 23-Aug-01 282 WF 225




23-Aug-01 282 WF 216 23-Aug-01 285 PMC 250 23-Aug-01 282 YP 180 23-Aug-01 285 NPM 240 23-Aug-01 282 YP 175 23-Aug-01 285 YP 180 23-Aug-01 282 YP 170 23-Aug-01 286 WF 245 23-Aug-01 282 YP 190 23-Aug-01 286 WF 250 23-Aug-01 282 YP 170 23-Aug-01 286 YP 166 23-Aug-01 282 YP 178 23-Aug-01 286 YP 180 23-Aug-01 282 YP 181 23-Aug-01 286 YP 175 23-Aug-01 282 YP 190 23-Aug-01 286 NPM 236 23-Aug-01 283 NPM 240 23-Aug-01 287 WF 236 23-Aug-01 283 NPM 230 23-Aug-01 287 WF 240 23-Aug-01 283 YP 165 23-Aug-01 288 YP 125 23-Aug-01 283 YP 165 23-Aug-01 288 YP 138 23-Aug-01 283 YP 190 24-Aug-01 289 PMC 128 23-Aug-01 283 WF 214 24-Aug-01 294 LNS 265 23-Aug-01 283 WF 249 30-Aug-01 301 LNS 239 23-Aug-01 283 WF 250 30-Aug-01 301 LNS 238 23-Aug-01 283 SF 125 30-Aug-01 304 PMC 125 23-Aug-01 284 WF 252 31-Aug-01 308 LNS 225 23-Aug-01 284 SF 122 06-Sep-01 317 LSS 295 23-Aug-01 284 YP 161 06-Sep-01 326 YP 200 23-Aug-01 284 YP 165 06-Sep-01 327 LSS 115 23-Aug-01 284 NPM 258 07-Sep-01 332 NPM 235 23-Aug-01 284 NPM 260 07-Sep-01 333 NPM 310 23-Aug-01 285 WF 228 07-Sep-01 334 WF 220 23-Aug-01 285 WF 235 07-Sep-01 335 NPM 120 23-Aug-01 285 WF 225 07-Sep-01 336 LNS 223 23-Aug-01 285 YP 185

1 For set information see appendix A. 2 Species where; WF = mountain whitefish, PMC = peamouth, NPM = northern pikeminnow, LNS = longnose sucker,

LSS = largescale sucker, YP = yellow perch, RSS = redsided shiner, and SF = pumpkinseed. 3 Length represents fork length (mm).


Appendix F. Cod trap set records, 2001.

Set ID Set Modified Set Time Set Location Date Number ID Trap (Y/N) (hr:min) Depth (m) Eastings Northings Comments

31-Jul-01 1 N 24:00 26.0 530212 5442328 31-Jul-01 2 N 24:00 17.2 530132 5442349 01-Aug-01 3 N 23:15 19.6 531887 5437219 01-Aug-01 4 N 24:27 24.4 530357 5436763 07-Aug-01 5 T16 N 22:15 23.0 534697 5432783 07-Aug-01 6 T9 N 22:16 21.9 534729 5432793 08-Aug-01 7 T9 N 25:45 19.5 533818 5430787 08-Aug-01 8 T16 N 25:45 19.4 533855 5430853 05-Sep-01 9 T83 Y 24:00 23.6 530391 5436788 Surface Temp. 18C 06-Sep-01 10 T83 Y 29:04 24.5 533573 5434531 Surface Temp. 18C

Appendix G. Cod trap catch records, 2001. Capture Set ID Fork

Date Number1 Species2 Length (mm) Comments

31-Jul-01 1 NPM 425 31-Jul-01 2 NPM 525 1.7 Kg / Consumed 3 Kokanee 01-Aug-01 4 PMC 205 01-Aug-01 5 PMC 240 08-Aug-01 7 NPM 245 08-Aug-01 8 NPM 295 08-Aug-01 8 NPM 260

1 For set information see appendix F. 2 Species where; PMC = peamouth, and NPM = northern pikeminnow.


Appendix H. Gill net set data from sampling in Crawford Bay, 2001.

Set Mesh Size Set Time Depth Location Date ID Location (inches) (Minutes) Min Max Eastings Northings

04-Sep-01 1 Crawford Bay 2 60 11.6 25.2 513624 5501311 04-Sep-01 2 Crawford Bay 1 64 6.5 25.3 513535 5501293 04-Sep-01 3 Crawford Bay 2 70 10.3 23.4 513445 5501273 04-Sep-01 4 Crawford Bay 2 73 12.2 22.7 513354 5501245 04-Sep-01 5 Crawford Bay 2 76 8.7 18.8 513224 5501243 04-Sep-01 6 Crawford Bay 1 84 3.0 17.6 513130 5501186 04-Sep-01 7 Crawford Bay 2 85 17.3 25.3 513081 5501144 04-Sep-01 8 Crawford Bay 2 81 12.8 23.4 512954 5501155 04-Sep-01 9 Crawford Bay 2 82 7.9 22.1 512908 5501126 04-Sep-01 10 Crawford Bay 1 77 4.5 17.9 512846 5501083 04-Sep-01 11 Crawford Bay 2 70 2.9 20.3 512834 5501115 04-Sep-01 12 Crawford Bay 2 80 4.7 18.9 512754 5501033

Appendix I. Gill net catch records from net sampling in Crawford Bay, 2001.

Date Set ID1 Species2 Length (mm)

04-Sep-01 1 WF 241 04-Sep-01 5 WF 230 04-Sep-01 6 NPM 113 04-Sep-01 6 YP 215 04-Sep-01 6 YP 221 04-Sep-01 8 WF 250 04-Sep-01 9 WF 268 04-Sep-01 10 WF 231 04-Sep-01 10 WF 272 04-Sep-01 10 WF 245 04-Sep-01 11 NPM 115 04-Sep-01 12 WF 228

1 For set information see appendix H. 2 Species where; WF = mountain whitefish, YP = yellow perch and NPM = northern pikeminnow.


Appendix J. Locations of juvenile sturgeon equipped with sonic tags in the summer of 2001

Date Fish Number Location CommentsEastings Northings

22-Aug-01 828 522841 5454223 Kootenay River, Location depth (12.6m) 22-Aug-01 837 522954 5454914 Kootenay River, Location depth (7.4m) 22-Aug-01 832 522905 5455763 Kootenay River, Location depth (10.2m)5-Sep-01 832 522972 5455559 Kootenay River, Location depth (16m)5-Sep-01 837 522353 5457545 Kootenay Delta, Location depth (36m)

24-Sep-01 837 524057 5459629 East Channel Mouth (20m)24-Sep-01 832 522948 5455560 River below CP Bridge (12m)9-Nov-01 828 522920 5455603 Kootenay Delta9-Nov-01 837 522367 5456668 Kootenay River

13-Dec-01 828 522873 5454372 Kootenay River4-Jan-02 837 522959 5454999 Rkm 119.54-Jan-02 828 522860 5455650 Rkm 121

Documents

Kootenay River White Sturgeon Studies in British Columbia ...a100.gov.bc.ca/appsdata/acat/documents/r176/... · Kootenay River White Sturgeon Studies – 2001 i Abstract Juvenile