Nestled high in the Sierra Nevada mountains of northern California, Lake Davis is renowned for its clear blue waters and tranquil setting, attracting visitors seeking both serenity and the challenge of catching trophy-sized trout. Yet, beneath its picturesque surface lies a history marked by a determined battle against an invasive species.
Nearly two decades ago, the California Department of Fish and Wildlife (CDFW) undertook a drastic and controversial measure to address the presence of northern pike, a fish unwelcome in Lake Davis. The agency released thousands of gallons of the fish-toxic chemical rotenone into the lake, its tributaries, and surrounding ponds. This potent poison was intended to eliminate all gill-breathing aquatic life, a necessary sacrifice to eradicate the invasive northern pike population.
Despite previous efforts, including a similar poisoning attempt in 1997 that ultimately failed to remove the pike, the CDFW remained resolute. Subsequent eradication strategies ranged from electro-fishing and netting to even the use of explosives. The persistent invasion of northern pike posed a significant threat to native fish species and the lake’s ecological balance.
A Controversial Last Resort
Ed Pert, the lead biologist on the eradication project, acknowledged the gravity of using chemicals in the ecosystem. Speaking with NPR at the time, he emphasized, “There’s no one that wants to put a bunch of chemicals in the water. I want to be clear about that. That’s just something that we have to do because it’s the last alternative that we have. No other alternatives will eradicate pike at Lake Davis.”
Described by one biologist as a “crapshoot,” the poisoning was deemed the final and best chance to remove the northern pike from Lake Davis and, by extension, from California’s waterways. The CDFW reported that these extensive efforts eventually succeeded, allowing the lake to be restocked with trout of various sizes and types, restoring its reputation as a premier fishing destination.