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Northern Pikeminnow Management Program Project 199907700.

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Presentation on theme: "Northern Pikeminnow Management Program Project 199907700."— Presentation transcript:

1 Northern Pikeminnow Management Program Project

2 Cooperators BPA WDFW ODFW PSMFC Outline Background Background Fisheries / Harvest Fisheries / Harvest Evaluation Evaluation Whats New Whats New Accomplishments Accomplishments

3 Losses to predation Diet, salmonids Population Background JOHN DAY RESERVOIR ( )

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

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

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

7 Priest Rapids Dam Hells Canyon Dam Program Area

8 Fishery Implementation and Harvest

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

10 Sport Reward Harvest,

11 Sport Reward Effort, Angler Days (in thousands)

12 ReservoirHarvestReservoirHarvest Below Bonneville 87,575 Ice Harbor 1,732 Bonneville55,097 Lower Monumental 1,983 The Dalles 30,153 Little Goose 33,828 John Day 328 Lower Granite 12,073 McNary18, Sport Reward Harvest by Reservoir

13 Family Catch (N = 96,790) Harvest (N = 10,964) % Acipenseridae % Catostomidae % Centrarchidae % Clupeidae % Cottidae2.6 % Cyprinidae % Ictaluridae % Percidae % Percopsidae<0.1 % Pleuronectidae % Salmonidae Sport Reward Incidental Catch, 2005

14 Evaluation

15 Northern Pikeminnow Exploitation, Sport Reward (> 250 mm FL),

16 Predation Relative to Pre-NPMP 78%

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

18 Northern Pikeminnow Electrofishing Catch Rates, John Day Reservoir

19 Family Northern pikeminnow (N = 291) Smallmouth bass (N = 364) % Salmonidae % Cottidae % Clupeidae % Clupeidae % Cyprinidae % Cyprinidae % Catostomidae % Catostomidae % Cobitidae % Cobitidae % Ictaluridae % Ictaluridae % Percopsidae % Percopsidae % Gasterosteidae % Gasterosteidae % Centrachidae % Centrachidae % Percidae % Percidae Diet Composition (samples with identifiable fish), Columbia and Snake Rivers, 1999,

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 Institutionalize Reward Structure Rolling Biological Indexing Rolling Biological Indexing Re-institute Dam Angling Re-institute Dam Angling Update Predation Model Update Predation Model Multi-year Exploitation Rates Multi-year Exploitation Rates Addition of Two Sport-reward Stations Addition of Two Sport-reward Stations

23 NPMP Accomplishments, 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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