Direct Survival of Migrating Salmonid Smolts in the Snake and Lower Columbia Rivers: Update with 2007 Results Northwest Power and Conservation Council.

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Presentation transcript:

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 steven.g.smith@noaa.gov John Williams john.g.williams@noaa.gov Bill Muir bill.muir@noaa.gov

Outline Juvenile survival and travel time through the hydropower system Update with preliminary 2007 results Annual summer “survival memo” released 31 August 2007

Outline SARs for Snake River spring-summer Chinook Difference in SARs between PIT-tagged and untagged fish Relationship between direct juvenile survival and SARs

Survival and Travel Time for PIT-tagged Spring Migrants

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

Many fish are transported Preliminary COMPASS estimates for 2007: 46% of non-tagged stream type Chinook 67% of non-tagged steelhead

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

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

Smolt-to-Adult Return (SAR) for Spring Migrants

Questions