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The Problem with Northern Pike in California What DFG Proposes to do about It

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The Problem with Northern Pike in California What DFG Proposes to do about It

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    1. The Problem with Northern Pike in California & What DFG Proposes to do about It California Department of Fish and Game

    3. Why Are Northern Pike a Problem? -Non-native Invasive Species

    4. Northern Pike as Top Predators Mouth full of teeth (roof of mouth covered with fine teeth) Wide gape; hard jaw Camouflage coloration Ambush predators

    5. Discuss survival rates here, citing the literature in the blue book. Discuss survival rates here, citing the literature in the blue book.

    6. Environmental Requirements prefers shallow (<40 feet) weed beds in slow-moving water considered a “cold water” fish but tolerates wide temperature ranges prefers clear water (visual predator) tolerates low oxygen lives in water up to 18 ppt salinity When I first started working on the northern pike project five years ago, I knew that fisheries biologists around the state were worried about the pike, but I didn’t really know why. It turns out that one of the causes for concern is that their requirements match so well many ecosystems in California. Dr. Peter Moyle, at UC Davis, suggested that we put together a body of information on pike habitat preferences and habitat requirements, and then compare that to the conditions that we find in different environments around the state. Dr. Moyle recommended one of his best students, Donna Maniscalco, as potentially interested in the work. This list is based in part on Donna’s work. When I first started working on the northern pike project five years ago, I knew that fisheries biologists around the state were worried about the pike, but I didn’t really know why. It turns out that one of the causes for concern is that their requirements match so well many ecosystems in California. Dr. Peter Moyle, at UC Davis, suggested that we put together a body of information on pike habitat preferences and habitat requirements, and then compare that to the conditions that we find in different environments around the state. Dr. Moyle recommended one of his best students, Donna Maniscalco, as potentially interested in the work. This list is based in part on Donna’s work.

    9. So What if Pike Escape? Could have devastating effects on: Sport Fisheries Commercial Fisheries (Salmon) Non-Game Species (for example Delta Smelt) Ability to Pump Water from Delta

    10. History of the Pike Problem In 1988 pike found in Frenchman Reservoir Successful pike eradication from Frenchman Reservoir in 1991 and Sierra Valley in 1992

    12. The 1997 Treatment

    13. Pike Rediscovered at Lake Davis in 1999

    14. What We Learned: We need to work with the community on the pike problem We need to provide all available information about chemical compounds We need to communicate better We need to cooperate with other agencies We can improve planning in many areas

    15. The Lake Davis Steering Committee Formed by the local community when pike reappeared in Lake Davis in 1999 Meets monthly with multiple agencies including DFG regarding the pike issue Developed the Y2000 Plan - a set of recommendations for controlling and containing the pike

    16. Early in this presentation we mentioned the Lake Davis Steering Committee and the Y2K Plan. The 1997 treatment was difficult for everyone, due to the controversy and the anger. So, it was a big disspointment for everyone when, on Memorial Day weekend in 1999, an angler caught a pike in Lake Davis. At that point, Robert Hight, who was the director of the Department of Fish and Game at the time, came up to Portola and met with community leaders. Describe development of the Y2000 plan and describe the methods and the resultsEarly in this presentation we mentioned the Lake Davis Steering Committee and the Y2K Plan. The 1997 treatment was difficult for everyone, due to the controversy and the anger. So, it was a big disspointment for everyone when, on Memorial Day weekend in 1999, an angler caught a pike in Lake Davis. At that point, Robert Hight, who was the director of the Department of Fish and Game at the time, came up to Portola and met with community leaders. Describe development of the Y2000 plan and describe the methods and the results

    17. The Number of Pike in Lake Davis Growing Rapidly…

    18. ...and Multiple Means of Escape

    19. Pike Eradication Proposal Reservoir drawdown to about 15,000 acre-feet (about 25% of normal summer level) Eradication with a liquid rotenone formulation Neutralize the rotenone Monitoring and reporting Mitigation measures Restock the reservoir and tributaries

    20. 7 Possible Pike Eradication Alternatives 5 involving reservoir drawdown and rotenone application (various reservoir levels) 1 non-chemical – De-Watering No Project

    21. Forest Service Proposal Issue a Special Use Permit to DFG to conduct eradication activities on National Forest Issue 2 Forest Closure Orders Workshop August 30, Portola Station Baptist Church

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