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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.

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

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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


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Outline and Steelhead Through the Snake/Columbia River Hydropower System and Adult Return Rates

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


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Outline and Steelhead Through the Snake/Columbia River Hydropower System and Adult Return Rates

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

  • Chinook and steelhead survival through individual reaches


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Outline and Steelhead Through the Snake/Columbia River Hydropower System and Adult Return Rates

  • 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


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Outline and Steelhead Through the Snake/Columbia River Hydropower System and Adult Return Rates

  • 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


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Chief Joseph and Steelhead Through the Snake/Columbia River Hydropower System and Adult Return Rates

Wells

GrandCoulee

Rocky Reach

Rock Island

Wanapum

Ice Harbor

Priest Rapids

Lower Granite

Little Goose

Lower Monumental

McNary

John Day

Bonneville

The Dalles

Hells Canyon

Oxbow

Brownlee

Estuary

recoveries

Juvenile detectors


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Transportation and Steelhead Through the Snake/Columbia River Hydropower System and Adult Return Rates

  • 62% of non-tagged stream type Chinook

  • 76% of non-tagged steelhead


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Lower Monumental-McNary and Steelhead Through the Snake/Columbia River Hydropower System and Adult Return RatesSurvival Partitioned in 2006

  • Chinook Salmon

    • LMN-MCN 0.887 (0.004)

      • Lower Monumental to Ice Harbor: 0.914 (0.003)

      • Ice Harbor to McNary Dam: 0.964 (0.005)

  • Steelhead

    • LMN-MCN: 0.776 (0.016)

      • Lower Monumental to Ice Harbor: 0.913 (0.010)

      • Ice Harbor to McNary Dam: 0.863 (0.018)


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Wells and Steelhead Through the Snake/Columbia River Hydropower System and Adult Return Rates

Rocky Reach

Rock Island

Wanapum

Ice Harbor

Priest Rapids

Lower Granite

Little Goose

Lower Monumental

McNary

John Day

Bonneville

The Dalles

Hells Canyon

Oxbow

Brownlee

Crescent Island



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Potential causes adult

  • Shed or expelled PIT tag

  • Tag not read in adult

  • Decreased fitness

  • Different passage history than untagged

  • Combination of the above


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Conclusions adult

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


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Conclusions adult

  • 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


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Conclusions adult

  • 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


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Conclusions adult

  • 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


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Questions adult


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