YNP Eliminating Non-Native Fish from Gibbon River

Yellowstone National Park is beginning a massive project to eliminate non-native rainbow trout, brook trout, and lake-dwelling grayling from the upper Gibbon River drainage.
Park staff today begin taking action that will culminate in re-introduction of native fish species to the river. Biologists will use rotenone, a naturally occurring chemical compound derived from the roots of certain tropical plants, to remove the existing fish. They will then add another compound to water at the lower bounds of the upper Gibbon River drainage to disable the effects of the rotenone and prevent impacts to downstream waters. After this action is complete, biologists will reintroduce native fish species to the upper Gibbon River drainage.
Beginning today and continuing through September 30, trails and campsites within the upper Gibbon River drainage will be closed to public access.