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Hatchery Subyearling Survival Lower Granite to McNary Dam 1998 to 2010 (preliminary results)

Hatchery Subyearling Survival Lower Granite to McNary Dam 1998 to 2010 (preliminary results). Fish Passage Center. Overview. PIT-tagged Hatchery Subyearling Chinook passing LGR dam during two-week blocks from May 20 to July 15 each year--from release sites

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Hatchery Subyearling Survival Lower Granite to McNary Dam 1998 to 2010 (preliminary results)

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  1. Hatchery Subyearling Survival Lower Granite to McNary Dam 1998 to 2010(preliminary results) Fish Passage Center

  2. Overview • PIT-tagged Hatchery Subyearling Chinook passing LGR dam during two-week blocks from May 20 to July 15 each year--from release sites ('CJRAP','GRAND1','PLAP','SNAKE3','SNAKE4','BCCAP','LUGUAF','NPTH','NLVP','CEFLAF') • Estimate Survival and Travel Time for blocks • Assign average environmental variables during passage such as Flow, Spill, Temperature and Water Transit Time • Show bivariate plots of Reach Survival and environmental variables.

  3. Survival for Hatchery Subyearling Chinook LGR to McN 1998 to 2010 with 95% CI’s

  4. Flows at LGS

  5. Flows at MCN

  6. Water Transit Time • WTT--Avg Time for Water Particle to Transit Reservoir • Q -- discharge at dam

  7. Converting Flows to Water Transit Time

  8. Temperatures at LGS

  9. Spill Percent by site May to July

  10. Comparison of Environmental conditions Flows in 2010 were higher than most other recent years. Avg spill volumes were high in 2010 similar to other years since 2005. Temperatures were at or below average compared to other recent years.

  11. Hatchery Subyearling Chinook Survival vs Avg Spill Prop LGS, LMN, IHR, McN

  12. Hatchery Subyearling Chinook Survival vs sum WTT LGS, LMN, IHR, McN

  13. Hatchery Subyearling Chinook Survival vs Avg Temp LGS, LMN, IHR, McN

  14. Hatchery Subyearling Chinook Survival vs detection probability at LGS, LMN, McN

  15. Probability of being transported

  16. Conclusions • For actively migrating subyearling Chinook, increased spill and decreased water transit time (higher flows) improve survival, while higher temperatures decrease survival • Survivals were relatively high in 2010 because of high flows through June and above average spill while temperatures were at or below the average for period of years analyzed

  17. Hatchery Subyearling Chinook Survival vs WTT and Spill Proportion

  18. Pearson Correlation Matrix

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