electronic recovery of pit tags from piscivorous bird colonies brad a. ryan, benjamin p. sandford,...

Electronic Recovery of PIT tags From Piscivorous Bird Colonies

Brad A. Ryan, Benjamin P. Sandford,

April Cameron, and Gene Matthews

>12 Million CRB Salmonids PIT tagged

3D9.1BF0F4058C

In the beginning-Visual recovery

OSU>2,500 Tags

Sand Flea 2000

1,119 Tags

Ed Nunnallee-400Khz

1998 Rice Island

47,057 Tags

1999

Hand Scanners

10,533 Tags

Lower Granite Dam

Oregon

Washington

IdahoSnake River

Mid-Columbia River

McNary Dam

John Day Dam

The Dalles DamBonneville Dam

Columbia River

Washington

Snake RiverColumbia River

Mid-Columbia River>131,000 -400 Khz Tags

East SandRice

92,314-Tags

Pilings

1,123-Tags

Little Memaloose & Miller

5,164-Tags

Three Mile Canyon

9,583-Tags

Crescent

21,492-Tags

Richland & Island 18

2,284-Tags

Conversion To 134.2 Khz ISO Tags

ISO-Antenna ISO-Electronics

>170,000-ISO Tags

Off The Shelf ISO Scanners

134.2 Khz

>55,000-ISO Tags

Lower Granite Dam

Oregon

Washington

IdahoSnake River

Mid-Columbia River

McNary Dam

John Day Dam

The Dalles DamBonneville Dam

Columbia River

Washington

Snake RiverColumbia River

Mid-Columbia River>225,000 -134.2 Khz Tags

East SandRice

>150,000 Tags

Pilings

>200-Tags

Little Memaloose & Miller

>10,700-Tags

Three Mile Canyon

>3,200-Tags

Richland & Island 18

>5,600-Tags

Pot Holes

>4,900-Tags

Crescent

>50,200-Tags

Foundation

Badger

>500-Tags

>7,900-Tags

Species Vulnerability

Photo by BAR

Lower Granite Dam

Oregon

Washington

IdahoSnake River

Mid-Columbia River

McNary Dam

John Day Dam

The Dalles DamBonneville Dam

Columbia River

Oregon

Washington

Snake River

Columbia River

Mid-Columbia River

Columbia River Estuary

Bonneville Dam

Avian Predation Spring chinook, Fall chinook, and Steelhead

Bon/Estuary Colonies

2.93.7

6.6

2.51.7

3.83.1

1.5

10.6

12.9

16.415.3

0

5

10

15

20

1999 2000 2001 2002

Migration Year

Det

ectio

n (%

)

S/S chinook

Fall chinook

Steelhead

Lower Granite Dam

Oregon

Washington

IdahoSnake River

Mid-Columbia River

McNary Dam

John Day Dam

The Dalles DamBonneville Dam

Columbia River

Oregon

Washington

Snake River

Columbia River

Mid-Columbia River

East Sand Island

Bonneville Dam

Estuarine Releases

Avian Predation on Estuarine Spring chinook, Fall chinook, and Steelhead

3.7

5.9

15.914.7

8.46.8

0

5

10

15

20

25

2001 2002

Migration Year

Det

ectio

n (%

)

Spring chinook

Fall chinook

Steelhead

Rearing History VulnerabilityHatchery vs. Wild

Photo by RDL

Hatchery vs WildRelative Vulnerability to TernsBon/East Is. --S/S chinook sal.

0.3

2.7

5.9

1.9

0.31.0

4.6

0.7

0

5

10

1999 2000 2001 2002

Migration Year

Det

ectio

n (%

)

Hatchery; n=3,497

Wild; n=252

Hatchery vs WildRelative Vulnerability to Terns

Low Mo./Crescent Is. --S/S chinook sal.

0.7 0.4

4.4

1.1 0.90.7 0.4

3.2

0.9 1.2

0

5

10

1999 2000 2001 2002 2003

Migration Year

Det

ectio

n (%

)

Hatchery; n=3,714

Wild; n=743

Hatchery vs WildRelative Vulnerability to Terns

Bon/East Is. --Steelhead

0.6

9.6

14.2 13.5

0.4

6.8

15.714.3

0

5

10

15

20

1999 2000 2001 2002

Migration Year

Det

ecti

on (

%)

Hatchery; n=1,897

Wild; n=1,294

*

Hatchery vs WildRelative Vulnerability to Terns

Low Mo./Crescent Is. --Steelhead

4.4

2.5

12.3

7.0

3.43.01.3

14.0

7.6

4.3

0

5

10

15

20

1999 2000 2001 2002 2003

Migration Year

Det

ectio

n (%

)

Hatchery

Wild

Additional Analysis

• Transportation– Barge vs. In-river

• Multiple Bypass

• Survival– ?

Other Applications

• Under Water

– Crescent Island Bay >500

• Race Ways

– Recovery of discarded tags

• Inside of Predators

– Detection of salmonid PIT tags in Caspian tern chicks.

Questions