26.Lake.Davis.11

26.Lake.Davis.11 - Rotenone Northern Pike and Lake Davis...

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Introduction Rotenone as a Piscicide Rotenone and its Fate Lake Davis in 1997 and 2007 Summary and Conclusions Rotenone, Northern Pike and Lake Davis
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I. Introduction Lake Davis is a major sport fishing area It is a man-made reservoir with a self-sustaining trout population The local economy of Portola, CA, depends on tourism The lake has historically served as the town’s water supply
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Lake Davis – A Temperate Lake!
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Annual Cycling of Temperate Lakes
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The Concern Driving the Program Lake Davis was infested with introduced northern pike Pike decimated the rainbow trout population The sport fishery was threatened with permanent decline If they had escaped, pike could have decimated downstream fish populations (trout, salmon, striped bass, and sturgeon) (to SF Bay)
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The Possible Solution Treat the lake with the piscicide rotenone to eradicate the pike Other impacted fishes could be restocked later This was unsuccessfully attempted in 1997 When treated again, there was concern for long term impacts
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II. Rotenone as a Piscicide It is a rotenoid isolated from the derris root (pea family) Some 68 species of Leguminosae are known to
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26.Lake.Davis.11 - Rotenone Northern Pike and Lake Davis...

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