1. Comparative Survival Study Project #199602000
Delayed Mortality Workshop
Feb 10, 2004
Bonneville Hot Springs Resort, WA
FPC, IDFG,ODFW, CRITFC, WDFW, and USFWS

2. Background
Study initiated in 1996 by states, tribes ,& FWS to estimate survival rates at various life stages
Compare survival rates for chinook from 3 areas
Develop a more representative control for transport evaluations
CSS information derived from PIT tags

3. The CSS is a joint project of the state, tribal fishery managers and the US Fish and Wildlife Service

5. LGR-LGR SAR transported group BON-LGR SAR transported group
Snake
Lower Granite
Little Goose
C o l u m b i a
Lower Monumental
Ice Harbor
McNary
In-river survival
John Day
Transport survival
The Dalles
LGR-LGR SAR
in-river group
Bonneville
T/I= ÷
BON-LGR SAR
in-river group
Estuary
LGR-LGR SAR transported group
BON-LGR SAR transported group
D = ÷
Ocean

6. Bootstrapped Survival Estimates
PITtag detection history
Summarize into Burnham tabulature …
calculate survivals and detection prob In -
river survivals and
detection prob.
Use detection history and detection prob. to estimate total arrival at LGR dam
LGR arrival number
Tally number first detected at each project and divide by survival to each project
Number of fish detected in LGR equivalents
LGR
arrival minus sum of all first detects in LGR equiv.
Number uncollected
Total number of adults arriving at BON from total number of smolt for most
representative of in
river and transport detections in LGR equiv.
BON SAR for in
river and transport
groups
Divide LGR
BON transport SAR by BON
BON in
river SAR
Estimate of T/C
Mulitply T/C by ratio of LGR
river survival to LGR
BON transport survival
Estimate of D
rel_date
river_km
rel_site
tag_id
5/11/94 17:10
SNAKER
7F7D41315C
6/1/94 15:49
SNAKER 1F 1F 1F -
Repeat 1000x to create confidence intervals
Create a new sample drawing at random
with replacement from original data

10. What does CSS project provide?
Long term consistent indices:
Travel Times
In-river Survival Rates
In-river SARs by route of passage
Transport SARs
Comparisons of SARs
Transport to In-River
By geographic location
By hatchery group
Hatchery to Wild
Chinook to Steelhead

11. Future Tasks Steelhead Marking
Increased Wild marking for Snake and Lower Columbia chinook
Marking subyearling chinook in Snake and Mid-Columbia
Upper Columbia chinook and steelhead marking