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Case Study:  Idaho Naturally Produced Chinook with Focus on Middle Fork Salmon River

Case Study:  Idaho Naturally Produced Chinook with Focus on Middle Fork Salmon River. Sharon W. Kiefer Idaho Dept. Fish and Game October, 2012. Middle Fork Salmon River Attributes: ►Free-flowing river with many tributaries, flows about 104 miles, ►A tributary to the Salmon River,

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Case Study:  Idaho Naturally Produced Chinook with Focus on Middle Fork Salmon River

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  1. Case Study:  Idaho Naturally Produced Chinook with Focus on Middle Fork Salmon River Sharon W. Kiefer Idaho Dept. Fish and Game October, 2012

  2. Middle Fork Salmon River Attributes: • ►Free-flowing river with many tributaries, flows about 104 miles, • ►A tributary to the Salmon River, • ►One of the original 8 Wild and Scenic Rivers (1968) • ►Elevation ranges 7,000 feet to 3,900 feet • ►Bear Valley and Marsh Creek converge to form the mainstem • ►Located in the Frank Church River of No Return Wilderness (1980) • - Frank Church Wilderness encompasses a total of 2,366,757 acres • - Second largest unit of the National Wilderness Preservation System • in the Lower 48

  3. Snake River Spring/Summer Chinook ESU

  4. Salmon River Sp/Su Chinook MPGs SF Salmon, MF Salmon, Up. Salmon Sp/Su Chinook

  5. WILD Fish: Middle Fork Salmon River Sp/Su Chinook Native, No hatchery history, naturally produced NATURAL Fish: Clearwater Basin Sp/Su Chinook Native or non-native, hatchery history, naturally produced IDFG Adopted MFSR Wild Fish Policy 1985

  6. ▪3 Smolt Traps: Marsh, Bear Valley, Big creeks ▪Video Adult Weir: Bear Valley Creek ▪Pit Tag Array: Big Creek ▪Redd Counts and Carcass Recovery ▪Juvenile PIT Tagging ▪Genetic Sampling ▪Snorkel Trend Surveys ▪Genetic Stock ID at Lower Granite Dam State, Tribal, Federal Contributors Monitoring Infrastructure

  7. Lower Granite Dam Runsize

  8. Smolt to Adult Return Rate

  9. Smolt to Adult Return Comparison of Snake and Mid-Col. Chinook

  10. Augmenting MFSR Redds with Adult Abundance = Genetic Stock Identification (GSI)

  11. SUMMARY • Run-size of W/N & H - correlated • Smolt-to-adult returns (SARs) of W/N & H – similar range & correlated • Mid-Columbia W/N SARs >> Snake W/N SARs • Salmon River redd count trends • Decline since 1950s & 1960s • W and N (hatchery influenced) trends similar since hatchery programs began in 1980s • Middle Fork Salmon comprise large portion of wild – similar trend • Natural origin spawner trends are similar in Wild and Hatchery influenced populations

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