By Anonymous Northern pike, Esox lucius, are a normative invasive fish species that threaten California's aquatic resources. California has been working to eradicate the fish from Lake Davis. The project uses a liquid rotenone formulation, CFT Legumine , to kill off the fish.

By The Associated Press PORTOLA - California officials have completed the grim task of collecting fish killed in last month's poisoning of Lake Davis to exterminate the northern pike. California Department of Fish and Game crews gathered nearly 50,000 pounds of fish since Sept.

By PETER FIMRITE, SAN FRANCISCO CHRONICLE PORTOLA, Calif. The poison began flowing into scenic Lake Davis early Tuesday morning, and by midday thousands of dead fish were washing ashore or floating belly-up in the northern Sierra reservoir.

By Samantha Young, Associated Press State workers on Tuesday began pouring a toxic chemical into a lake nestled in the mountains of the Sierra Nevada as part of California's decadelong effort to exterminate a predatory northern pike.

NATURE: State poisons Sierra Nevada lake for a second time in attempt to rid it of predatory fish.