Title

Tracking a High Risk Fluvial Bull Trout Population with Half-duplex

Passive Interrogation

Vince Tranquilli

Oregon Department of Fish and Wildlife

Research and Monitoring Program

Upper Willamette River Basin

South Fork McKenzie River

Map

Project- Funded by USACE

- modify dam intake for water temperature

- draw-down the reservoir for 3 - 4 years

- high risk bull trout population

- no fish passage

Cougar Dam Water Temperature Control Project

Info. data

Need information

- migration timing - entrainment - abundance

Info. data

Need information

- migration timing - entrainment - abundance

Data Sets- radio telemetry- PIT interrogation

Methods apply high risk population

Radio TelemetryRadio Telemetry

Radio Telemetry

Radio Telemetry Data (N = 25)

0

5

10

15

20

25

Jan-

01

Apr-0

1

Jul-0

1

Oct

-01

Jan-

02

Apr-0

2

Jul-0

2

Oct

-02

Jan-

03

Apr-0

3

Jul-0

3

Oct

-03

DATE

RM

Reservoir

Dam

HDX PIT tags

Reduce Risk? And, increase sample size

HDX PIT tagsTI-RFid

23 mm half-duplex

pulsed RF field 134.2 KHz

transmits 123.2 KHz

10 reads per second

PIT taggingTag- shedding- orientation

Fish > 100 mm FL

DORemote PIT tag Interrogation Site

DODetection Efficiency: 90% at 200 cfs, N = 30

DODetection Efficiency: 73% at 1,000 cfs, N = 30

DODetection Efficiency: 73% at 1,000 cfs, N = 30

Operating at 12 VDC – Increase Performance

DO

low impact on fish behavior

3 int sitesFluvial Bull TroutUp and Downstream Movements

Detection Efficiency

Min. Detection Efficiencies

U = Up D = Down

U: 62%, N = 26 D: 63%, N = 27

U: 93%, N = 15 D: 93%, N = 14

U: 81%, N = 21 D: 80%, N = 20

SpawnSpawning Escapement:

Electronic fish counter- No. of fish- Direction of travel

Time lapse Video- Species

Double counting fish?

Identify Add Remote PIT tag Interrogation

For example:

113270247 Up Aug. 30113270247 Down Sep. 9113270247 Up Sep. 12113270247 Down Sep. 18

Identify Add Remote PIT tag Interrogation

- Identify individual fish movements- Improve accuracy of fish count

For example:

113270247 Up Aug. 30113270247 Down Sep. 9113270247 Up Sep. 12113270247 Down Sep. 18

Juvenile but

Juvenile Bull Trout

0

5

10

15

20

25

Apr-0

1

Jul-0

1

Nov-0

1

Feb-0

2

May

-02

Sep-0

2

Dec-0

2

Mar

-03

Jun-

03

Oct-0

3

Jan-

04

Apr-0

4

DATE

RM

July of 2001, 115 mm FL

Oct. 2003

Jan. 2004

Adult but

Adult Entrainment at Cougar Dam

0

5

10

15

20

25

Mar

-03

May

-03

Jun-

03

Aug-0

3

Oct-0

3

Nov-0

3

Jan-

04

DATE

RM

Reservoir

Dam

Caught below dam

Fish Captured Below Cougar Dam

0

5

10

15

20

25

Mar-0

3

May-0

3

Jun-

03

Aug-0

3

Oct

-03

Nov-0

3

Jan-

04

DATE

RM

Spawning tributary

Caught below dam

Fish Captured Below Cougar Dam

0

5

10

15

20

25

Mar-0

3

May-0

3

Jun-

03

Aug-0

3

Oct

-03

Nov-0

3

Jan-

04

DATE

RM

All PIT 2003

2003 PIT tag Detections (N = 38)

0

5

10

15

20

25

Jan-

03

Mar

-03

May

-03

Jun-

03

Aug-0

3

Oct-03

Nov-0

3

Jan-

04

DATE

RM

RC

Spiral Antenna

Highly adaptable system = site-specific antenna designs

Reading frame

Reading frame

Detection area extends beyond the antenna frame

SC

Detection area extends beyond the antenna frame

multiple antennas

Multiple antenna sites = synchronize or multiplex

Wired synchMultiple Antenna Sites:

- Wireless synch.- Wired synch.

MultiplexMultiple Antenna Sites:

- Wireless synch.- Wired synch. - Multiplex

PowerPower: - access to AC power

PowerPower: - access to AC power- battery swapping

PowerPower: - access to power line- battery swapping- on-site generation

Handheld

Hand-held PIT tag Reader

- $300- Compatible with FDX / HDX

Handheld

Hand-held PIT tag Reader

- $300- Compatible with FDX / HDX

Handheld

Pocket PIT tag Reader

- Compatible with FDX / HDX

Acknowledgements:

Alex HaroGayle Zydlewski