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Northern Pikeminnow Management Program

Northern Pikeminnow Management Program. Project 199907700. Cooperators. Outline. Background Fisheries / Harvest Evaluation What’s New Accomplishments. BPA. WDFW. ODFW. PSMFC. Background. JOHN DAY RESERVOIR (1983-86). Losses to predation. Diet, salmonids. Population.

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Northern Pikeminnow Management Program

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  1. Northern Pikeminnow Management Program Project 199907700

  2. Cooperators Outline • Background • Fisheries / Harvest • Evaluation • What’s New • Accomplishments BPA WDFW ODFW PSMFC

  3. Background JOHN DAY RESERVOIR (1983-86) Losses to predation Diet, salmonids Population

  4. John Day Reservoir (continued) Northern pikeminnow predation increased with size

  5. Background SYSTEM-WIDE (1990-92) Predation Relative to John Day Reservoir Below Bonneville Dam = 800% Lower Columbia Reservoirs = 325% Lower Snake River Reservoirs = 40% Loss to Predation = 8% of Population

  6. Background 10-20% Exploitation = 50% Reduction in Predation Assumes no compensation by remaining predators: abundance, growth, fecundity, age structure, et al. Fisheries implemented systemwide in 1991

  7. Priest Rapids Dam Hell’s Canyon Dam Program Area

  8. Fishery Implementation and Harvest

  9. Northern Pikeminnow Fisheries Sport Reward (WDFW) 1991-Present Dam Angling (ODFW, CRITFC, et al.) 1991-2002 Gill Net (CRITFC, YIN, et al.) 1994-2002

  10. Sport Reward Harvest, 1991-2005

  11. Sport Reward Effort, 1991-2005 Angler Days (in thousands)

  12. 2005 Sport Reward Harvest by Reservoir

  13. Sport Reward Incidental Catch, 2005

  14. Evaluation

  15. Northern Pikeminnow Exploitation, Sport Reward (> 250 mm FL), 1991-2005

  16. Predation Relative to Pre-NPMP 78%

  17. Compensation? Abundance, density, age, growth, fecundity, consumption, condition No Northern Pikeminnow Smallmouth Bass Maybe Walleye No

  18. Northern Pikeminnow Electrofishing Catch Rates, John Day Reservoir

  19. Diet Composition (samples with identifiable fish), Columbia and Snake Rivers, 1999, 2004-2005

  20. SMB Consumption Index – John Day Forebay

  21. Age 4 and 5 SMB, Below Bonneville Dam

  22. Recent Changes and Plans for 2006 • Institutionalize Reward Structure • Rolling Biological Indexing • Re-institute Dam Angling • Update Predation Model • Multi-year Exploitation Rates • Addition of Two Sport-reward Stations

  23. NPMP Accomplishments, 1991-2005 • Over 2.7 million Northern Pikeminnow Removed • Low Impact to Resident / Anadromous Species • >10% Exploitation Achieved in 13 of 15 Years • Estimated 22% Reduction in Salmonid Predation • Compensation by Remaining Predators Minimal • Credible Science: ~30 Journal Articles Published • Cost Effective

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