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Snake River Trout Population Dynamics

Snake River Trout Population Dynamics. Jon Ewert, Colorado Division of Parks and Wildlife. Andrew Todd, US Geological Survey. All photos by Bob Berwyn. . Arapahoe Basin Ski Area. Chihuahua Gulch. North Fork Snake River. To Silverthorne. Snake River. Peru Creek. . Keystone Ski Area.

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Snake River Trout Population Dynamics

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  1. Snake River Trout Population Dynamics Jon Ewert, Colorado Division of Parks and Wildlife Andrew Todd, US Geological Survey All photos by Bob Berwyn

  2. Arapahoe Basin Ski Area Chihuahua Gulch North Fork Snake River To Silverthorne Snake River Peru Creek  Keystone Ski Area MAP AREA Deer Creek 0 1 2 Upper Snake River N Denver SCALE (miles) C O L O R A D O LEGEND Continental Fish Absent Divide Fish Present 108 ° 104 °

  3. “Tram Bridge” station

  4. Brook trout capture, Tram Bridge station

  5. Rainbow trout overwinter survival

  6. Rainbow trout body condition: 2009 sample

  7. “Hole 7” Station

  8. Hole 7 Station vs. Tram Bridge: Brook Trout Population Estimates

  9. Snake River Above Peru Creek • Increases in metals concentrations beyond toxicity thresholds may render currently marginal fish habitat uninhabitable

  10. Thanks! . . . questions?

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