Hatchery Subyearling Survival Lower Granite to McNary Dam 1998 to 2007 (preliminary results) Fish Passage Center.

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Presentation transcript:

Hatchery Subyearling Survival Lower Granite to McNary Dam 1998 to 2007 (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 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.

Lower Granite to McNary Dam Reach

Timing of Subyearling fall Chinook at LGR Dam in 2006 compared to Historic Timing

Survival for Hatchery Subyearling Chinook LGR to McN 1998 to 2006 with 95% CI’s

Comparison of Environmental conditions at LGS 1998 to 2007 Flows in 2007 were low from late May through the end of July; similar to 2001 Spill proportion was high in 2007 but volumes were low Temperatures were warm in 2007 similar to 2005 and 2006

Hatchery Subyearling Chinook Survival vs Avg Spill Pct LGS, LMN, IHR, McN

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

Converting Flows to Water Transit Time

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

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

Hatchery Subyearling Chinook Survival vs WTT and Spill Proportion

Conclusions For actively migrating subyearling Chinook, increased spill and decreased water transit time (higher flows) appear to improve survival, while higher temperatures decrease survival