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

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

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

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

Bootstrapped Survival Estimates PITtag detection history Summarize into Burnham tabulature 100000 356 110000 221 … 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 17:10 522.226 SNAKER 7F7D41315C 6/1/94 15:49 522.226 SNAKER 1F56355105 1F57530334 1F57716732 - Repeat 1000x to create confidence intervals Create a new sample drawing at random with replacement from original data

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

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