Park Removing Non-Native Fish

Beginning next week, Yellowstone Park staff will continue a project to eliminate nonnative fish from the upper Gibbon River drainage.
From August 20 through August 26, biologists will remove nonnative rainbow trout and brook trout in the upper Gibbon River drainage using the fish toxin rotenone. Rotenone is a naturally occurring chemical compound derived from the roots of tropical plants.
Below the treatment area biologists will add potassium permanganate to the water to remove the effects of rotenone and prevent impacts to downstream waters. To ensure the removal of nonnative fish, these treatments will be repeated in 2019 and, if needed, 2020. Reintroduction of native fish would begin in 2021.
The Wolf Lake Trail and Virginia Cascades Drive will be closed to the public during this project.