Downstream Survival of Juvenile Stream Type Chinook Salmon and Steelhead Through the Snake/Columbia River Hydropower System and Adult Return Rates AFEP.

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Presentation transcript:

Downstream Survival of Juvenile Stream Type Chinook Salmon and Steelhead Through the Snake/Columbia River Hydropower System and Adult Return Rates AFEP November 13, 2006 Bill Muir, Steve Smith, John Williams, and Doug Marsh

Outline Stream type Chinook survival from Snake River Basin hatcheries to LGR

Outline Stream type Chinook survival from Snake River Basin hatcheries to LGR Chinook and steelhead survival through individual reaches

Outline Stream type Chinook survival from Snake River Basin hatcheries to LGR Chinook and steelhead survival through individual reaches Their survival through the entire hydropower system

Outline Stream type Chinook survival from Snake River Basin hatcheries to LGR Chinook and steelhead survival through individual reaches Their survival through the entire hydropower system Smolt-to-adult returns

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 Estuary recoveries Juvenile detectors

Transportation 62% of non-tagged stream type Chinook 76% of non-tagged steelhead

Lower Monumental-McNary Survival Partitioned in 2006 Chinook Salmon –LMN-MCN (0.004) Lower Monumental to Ice Harbor: (0.003) Ice Harbor to McNary Dam: (0.005) Steelhead –LMN-MCN: (0.016) Lower Monumental to Ice Harbor: (0.010) Ice Harbor to McNary Dam: (0.018)

Bonneville The Dalles John Day Hells Canyon Oxbow Brownlee Priest Rapids Wanapum Rock Island Rocky Reach Wells McNary Ice Harbor Little Goose Lower Granite Lower Monumental Crescent Island

How big of part does hydropower system survival play in adult returns?

Potential causes Shed or expelled PIT tag Tag not read in adult Decreased fitness Different passage history than untagged Combination of the above

Conclusions Stream type Chinook survival averaged 64% from hatchery release to the first dam in 2006

Conclusions Stream type Chinook survival averaged 64% from hatchery release to the first dam in 2006 Reach survival averaged 93% per project for Chinook and 88% for steelhead in 2006

Conclusions Stream type Chinook survival averaged 64% from hatchery release to the first dam in 2006 Reach survival averaged 93% per project for Chinook and 88% for steelhead in 2006 Hydropower system survival was 58% for Chinook and 37% for steelhead in 2006

Conclusions Stream type Chinook survival averaged 64% from hatchery release to the first dam in 2006 Reach survival averaged 93% per project for Chinook and 88% for steelhead in 2006 Hydropower system survival was 58% for Chinook and 37% for steelhead in 2006 Chinook and steelhead direct hydropower system survival has little influence on SAR

Questions