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Federal Energy Regulatory Commission Hydroelectric Operations

Federal Energy Regulatory Commission Hydroelectric Operations . Wild Rainbow ( Redband ) Trout . Redband Spawning and Population Study Elements Hydrology Review Spawning Patch Inventory of the Study Area Physical Characterization of Spawning Patches

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Federal Energy Regulatory Commission Hydroelectric Operations

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  1. Federal Energy Regulatory CommissionHydroelectric Operations

  2. Wild Rainbow (Redband) Trout

  3. Redband Spawning and Population Study Elements • Hydrology Review • Spawning Patch Inventory of the Study Area • Physical Characterization of Spawning Patches • Hydrodynamic Characterization of Spawning Patches • Biological Spawning Characterization • Effective Spawning/Incubation Habitat Relationships • Redband Trout Abundance Estimates (ten years)

  4. Study Reach and Patch Inventory (2009)

  5. Substrate Characterization

  6. Survey Patch Area and Elevation

  7. Survey Water Elevations

  8. Redband Trout Spawning Period 2010 Spawning Survey (2010)

  9. Spawning Areas Mapped

  10. Observed Redband Trout Depth and Velocity Frequency

  11. Artificial Redds for Intra-gravel Survival

  12. Trout Fry Survival

  13. Cumulative Spawning Plot Area

  14. Results 2010 • 58 Gravel Patches • Deeper Spawning: Ave. 3.5’, Max. Over 5 Feet • 148 Redds Counted in 2010 (130 in 2003) • Appears There is Good Intra-Gravel Survival • Habitat Over a Range of Flows • Effective Spawning and Incubation Habitat Tables

  15. Mark-Recapture Population Estimate

  16. Results • Tagged Over 800 Redbands in 2010 • Estimated Over 1,300 Ten Inch Fish in 2010 • Tagged Over 650 Redbands in 2011 • Estimated Over 1,400 Ten Inch Fish in 2011 • Tagged Over 455 Redbands in 2012 • Estimate Over 1,050 Ten Inch Fish in 2012

  17. Effective Spawning and Incubation Habitat Length and Age Frequency

  18. Tim Vore 509.495.8612 tim.vore@avistacorp.com Credits: West Fork Environmental, CardnoEntrix, WDFW

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