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Direct Survival of Migrating Salmonid Smolts in the Snake and Lower Columbia Rivers: Update with 2007 Results Northwest Power and Conservation Council Science Policy Exchange September 12, 2007 Steve Smith John Williams Bill Muir
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Outline Juvenile survival and travel time through the hydropower system Update with preliminary 2007 results Annual summer “survival memo” released August 2007
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Outline SARs for Snake River spring-summer Chinook
Difference in SARs between PIT-tagged and untagged fish Relationship between direct juvenile survival and SARs
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Survival and Travel Time for PIT-tagged Spring Migrants
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Juvenile detectors Chief Joseph Wells Grand Coulee Rocky Reach
Bonneville The Dalles John Day Hells Canyon Oxbow Brownlee Priest Rapids Wanapum Rock Island Rocky Reach Wells Chief Joseph Grand Coulee McNary Ice Harbor Little Goose Lower Granite Lower Monumental Juvenile detectors Snake R. trap
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Many fish are transported
Preliminary COMPASS estimates for 2007: 46% of non-tagged stream type Chinook 67% of non-tagged steelhead
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Stream-type Chinook salmon reach survival 93.0 96.0 93.7 95.6 92.2
LGR LGO LMO 93.0 SRT 96.0 ICE BON TDA JDA MCN 93.7 95.6 92.2 82.0 (90.6) 94.3 87.7 93.2 92.4 90.3 85.1 81.4 (90.0) 85.5 MCN JDA LMO LGR LGO SRT BON
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Steelhead reach survival 90.1 95.4 88.6 91.3 94.7 61.4 (78.4) 100.0
LGR LGO LMO 90.1 SRT 95.4 ICE BON TDA JDA MCN 88.6 91.3 94.7 61.4 (78.4) 100.0 84.8 94.2 90.5 88.7 74.6 72.4 (84.9) 73.1 MCN JDA LMO LGR LGO SRT BON
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Smolt-to-Adult Return (SAR) for Spring Migrants
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Questions
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