Movement of Rainbow Trout in Arkansas Movement of Rainbow Trout in Arkansas TailwatersTailwaters

Daniel D. Magoulick

Arkansas Cooperative Fish and Wildlife Research UnitDepartment of Biological Sciences

University of Arkansas - Fayetteville

Questions About C & R AreasQuestions About C & R Areas• Do resident trout stay within the C & R areas?Do resident trout stay within the C & R areas?

• Do rainbow trout maintain home ranges?Do rainbow trout maintain home ranges?

• How do movements compare to the CR lengths?How do movements compare to the CR lengths?

http://www.arkansas.com/photo-gallery/default.asp#Bull Shoals Lake and the White River

Bull Shoals Bull Shoals Dam & Dam & TailwaterTailwater

Study SitesStudy Sites

BULL SHOALS

RIM SHOALS

NORFORK

SYLAMORE

Stream Length (m)Stream Length (m)

Bull Shoals = 1400Bull Shoals = 1400

Norfork = 1600Norfork = 1600

Rim Shoals = 2600Rim Shoals = 2600

Sylamore = 4200Sylamore = 4200

MethodsMethods

Two Approaches Two Approaches

I. RadiotelemetryI. Radiotelemetry

II. Otolith MicrochemistryII. Otolith Microchemistry

http://www.marinebiodiversity.ca/otolith/english/daily.htm

Part I: RadiotelemetryPart I: Radiotelemetry

I.I. Data CollectionData Collection

II.II. GIS AnalysisGIS Analysis

III.III. SAS AnalysisSAS Analysis

IV.IV. SYSTAT AnalysisSYSTAT Analysis

PAIRED STUDY DESIGNPAIRED STUDY DESIGN

20 IN / 20 OUT in Fall 200520 IN / 20 OUT in Fall 2005

*Boosted to 20 IN at Bull, *Boosted to 20 IN at Bull, Norfork & Rim in Spring 2006Norfork & Rim in Spring 2006

Radiotelemetry DesignRadiotelemetry Design

• CaptureCapture• TagTag• Weekly Locations & Weekly Locations &

FatesFates

Norfork Preliminary StudyNorfork Preliminary Study • Good RetentionGood Retention• Growth Rates/Condition fromGrowth Rates/Condition from Population EstimatesPopulation Estimates

Capture & TaggingCapture & Tagging

1.1. CaptureCapture

2.2. Sedate Sedate

3.3. Weight (450 g +) & LengthWeight (450 g +) & Length

4.4. Picture & VI TagPicture & VI Tag

Capture & TaggingCapture & Tagging

5. Incision5. Incision

6. Antibiotic Injection (OTC)6. Antibiotic Injection (OTC)

7. Tag Insertion7. Tag Insertion

8. Stitches & Ointment8. Stitches & Ointment

9. Revive and Release9. Revive and Release

FinishedFinished

Tracking SummaryTracking Summary

• 230 Total Fish Tagged230 Total Fish Tagged– 144 Tagged IN CR144 Tagged IN CR– 86 Tagged OUT CR86 Tagged OUT CR

• 124 (54%) Individuals Tagged had 15+124 (54%) Individuals Tagged had 15+– 86/144 (60%) Tagged IN86/144 (60%) Tagged IN– 38/86 (44%)Tagged OUT38/86 (44%)Tagged OUT

• Average of 24 Relocations/Fish Used for Home Average of 24 Relocations/Fish Used for Home Range AnalysisRange Analysis

*All further analysis includes only fish with 15+ locations*All further analysis includes only fish with 15+ locations

Locations: In vs. OutLocations: In vs. Out• 60/86 Tagged In Stayed In (70%)60/86 Tagged In Stayed In (70%)• 22/38 Tagged Out Stayed Out (58%)22/38 Tagged Out Stayed Out (58%)• 42/124 Moved In-between (34%)42/124 Moved In-between (34%)

– Fish Tagged OUT at Rim Were Found IN on Average 26% of the Time Fish Tagged OUT at Rim Were Found IN on Average 26% of the Time – Fish Tagged IN at Sylamore Were Found OUT on Average 53% of the Fish Tagged IN at Sylamore Were Found OUT on Average 53% of the

TimeTime

SYLAMORERIMNORFORKBULL

SITE

IN OUTTAGGED

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Movement: Distance vs. CRMovement: Distance vs. CR

IN OUTTAGGED

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BULL SYLAMORE

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• Overall: 24/124 (15%) Moved > Length of Respective CR AreasOverall: 24/124 (15%) Moved > Length of Respective CR Areas• Bull: 4/32 (13%) Moved >1700 mBull: 4/32 (13%) Moved >1700 m• Norfork: 9/31 (29%) Moved > 1800 mNorfork: 9/31 (29%) Moved > 1800 m• Rim: 4/35 (11%) Moved ( > 2600 mRim: 4/35 (11%) Moved ( > 2600 m• Sylamore: 7/26 (27%) Moved >4000 mSylamore: 7/26 (27%) Moved >4000 m

*NOTE SCALE

95% of time spent

95% of time spent

between here

between here

N Linear Range (m) 95% 90% 50%

IN 25 450 320 230 70(130-2330) (130-2540) (70-2510) (20-530)

OUT 7 1390 400 240 90(110- 9240) (40-9620) (30-9620) (0-350)

IN 24 275 165 90 30(40-7570) (50-8060) (20-7750) (0-270)

OUT 7 770 210 110 40(60-6380) (60-6960) (60-6290) (20-5170)

IN 25 670 450 190 40(60-34990) (80-3420) (50-3400) (20-1340)

OUT 10 1505 1530 690 70(140-8340) (60-3640) (50-2900) (20-100)

IN 12 2100 2305 1515 40(260-7990) (30-8160) (120-7600) (30-3030)

OUT 14 2280 1365 1255 50(180-8050) (190-8060) (90-6990) (20-140)

Norfork

Rim Shoals

Sylamore

Comparisons Within Sites

Tag LocationBull Shoals

SYSTAT: Within Site ANOVA’sSYSTAT: Within Site ANOVA’sMedian and range (in parentheses)Median and range (in parentheses)

N Linear Range (m) 95% 90% 50%

IN 25 450 320 230 70(130-2330) (130-2540) (70-2510) (20-530)

OUT 7 1390 400 240 90(110- 9240) (40-9620) (30-9620) (0-350)

IN 24 275 165 90 30(40-7570) (50-8060) (20-7750) (0-270)

OUT 7 770 210 110 40(60-6380) (60-6960) (60-6290) (20-5170)

IN 25 670 450 190 40(60-34990) (80-3420) (50-3400) (20-1340)

OUT 10 1505 1530 690 70(140-8340) (60-3640) (50-2900) (20-100)

IN 12 2100 2305 1515 40(260-7990) (30-8160) (120-7600) (30-3030)

OUT 14 2280 1365 1255 50(180-8050) (190-8060) (90-6990) (20-140)

Bull Shoals

Norfork

Rim Shoals

Sylamore

Comparisons Within Sites

Tag Location

SYSTAT: AMONG Site ANOVA’sSYSTAT: AMONG Site ANOVA’sMedian and range (in parentheses)Median and range (in parentheses)

Reach N Linear Range (m) 95% 90% 50%

BULL 25 450 320 230 70(130-2330) (130-2540) (70-2510) (20-530)

NORFORK 24 275 165 90 30(40-7570) (50-8060) (20-7750) (0-270)

RIM 25 670 450 190 40(60-34990) (80-3420) (50-3400) (20-1340)

SYLAMORE 12 2100 2305 1515 40(260-7990) (30-8160) (120-7600) (30-3030)

BULL 7 1390 400 240 90(110- 9240) (40-9620) (30-9620) (0-350)

NORFORK 7 770 210 110 40(60-6380) (60-6960) (60-6290) (20-5170)

RIM 10 1505 1530 690 70(140-8340) (60-3640) (50-2900) (20-100)

SYLAMORE 14 2280 1365 1255 50(180-8050) (190-8060) (90-6990) (20-140)

Comparisons Between Tag Locations

Tagged IN

Tagged OUT

Discussion• At most sites fish tagged OUT were found IN more than At most sites fish tagged OUT were found IN more than

vice-versavice-versa– At Sylamore, fish movement between areas was common At Sylamore, fish movement between areas was common

• Most fish are moving less than the lengths of their Most fish are moving less than the lengths of their respective CR areasrespective CR areas– Sylamore had the largest home range estimatesSylamore had the largest home range estimates

• Warm water may force fish to moveWarm water may force fish to move

ConclusionsConclusionsMajority (70%) tagged in the CR have remained there Majority (70%) tagged in the CR have remained there

• Only 15% of all tagged fish (IN or OUT) had linear distance > the Only 15% of all tagged fish (IN or OUT) had linear distance > the length of their CR areas length of their CR areas

• CR areas appear to have no effect on distances movedCR areas appear to have no effect on distances moved

Most of the fish tagged IN are being protected fromMost of the fish tagged IN are being protected fromangler mortality, increasing their residence time,angler mortality, increasing their residence time,allowing them to grow larger allowing them to grow larger