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Fish Kill Saves Rare Trout in Sierra Nevada
14 Sep
Summary
- Rotenone used to remove non-native trout threatening native Paiute cutthroat.
- Native Paiute cutthroat trout faced extinction due to hybridization.
- Restoration in Silver King Creek continues with controversial methods.
In a remote area of California's Sierra Nevada, conservationists employed a drastic measure to protect the Paiute cutthroat trout, one of North America's rarest fish. During the early 1990s, wildlife managers used rotenone, a chemical fish toxicant, in Silver King Creek to eliminate non-native rainbow trout and hybrids that were endangering the native species.
This controversial restoration effort, conducted between 1991 and 1993 in Alpine County, aimed to re-establish the Paiute cutthroat trout in its original habitat. Rotenone was applied through drip stations, with potassium permanganate used downstream to neutralize the chemical, preventing its spread.
The Paiute cutthroat trout, native to Silver King Creek, faced decline due to hybridization with introduced trout species. Previous attempts in 1964 and 1976 to remove these competitors were unsuccessful.
After thorough surveys confirmed the eradication of non-native trout, conservationists reintroduced Paiute cutthroat trout sourced from protected areas within the same watershed. Ongoing efforts involve habitat protection and barrier construction to prevent the return of invasive fish.
Future restoration projects have since expanded, utilizing the same techniques to conserve the Paiute cutthroat trout. This approach underscores the difficult decisions involved in ecological restoration.
