Comparative Survival Study Project

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Comparative Survival StudyProject 199602000

• Delayed Mortality Workshop
• Feb 10, 2004
• Bonneville Hot Springs Resort, WA
• FPC, IDFG,ODFW, CRITFC, WDFW, and USFWS

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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

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



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Snake
Lower Granite
Little Goose
C o l u m b i a
Lower Monumental
Ice Harbor
McNary
In-river survival
Transport survival
John Day
The Dalles
Bonneville
Estuary
Ocean
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Bootstrapped Survival Estimates
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Create a new sample drawing at random with
replacement from original data Repeat 1000x to
create confidence intervals

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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

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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