Yellowstone Trout War: Invasive Species Targeted

Yellowstone National Park will temporarily close a section of Buffalo Creek from August 31 to September 7 as part of a targeted effort to remove invasive rainbow trout. This conservation operation aims to protect the native Yellowstone cutthroat trout, the park's sole trout species, from competition and hybridization. The northern section of the creek will be inaccessible to visitors during this period.

Biologists will use rotenone, a piscicide approved by the US Environmental Protection Agency, to treat the waterway. This chemical has been previously employed by the park service in similar native fish restoration projects, such as in the Soda Butte Creek drainage. These efforts have proven successful in removing nonnative populations and fostering the recovery of native cutthroat trout.

The operation is crucial for maintaining the ecological health of the Lamar River watershed. Invasive rainbow trout in Buffalo Creek pose a significant threat by entering and impacting nearby waterways, including Slough Creek, Soda Butte Creek, and the Lamar River. The park has confirmed that the treatment will not compromise the potability of water at Slough Creek Campground.

Steps are being taken to minimize impacts on other aquatic organisms. Native Yellowstone cutthroat trout captured before the treatment will be relocated. The National Park Service emphasizes that rotenone is used selectively and at the lowest effective concentration, with conservation teams taking measures to reduce risks to amphibians and other wildlife.