YELLOWSTONE PARK fisheries biologists are poisoning introduced rainbow and brook trout our of the Upper Gibbon River drainage to reintroduce westslope cutthroat and Arctic grayling.
Yellowstone National Park fisheries biologists will soon discharge the fish poison rotenone into much of the Upper Gibbon River drainage, which will be off-limits for part of September.JACKSON HOLE NEWS & GUIDE AUGUST 30
The project, which (started) Monday until Sept. 13, is designed to scrub non-native rainbow trout and brook trout out of the watershed, a step that would enable the reintroduction of westslope cutthroat trout and Arctic grayling.
Those two species are native to the Yellowstone River watershed but are not thought to be native to the Upper Gibbon system. The mottled sculpin, a minnow, is the only fish species known to naturally occur in the Gibbon above Gibbon Falls, park documents say.
Among eight stream watersheds from which Yellowstone has removed or plans to remove exotic species, the Gibbon project is by far the most ambitious. An estimated 111 miles of stream and seeps will be poisoned, according to the park’s native fish conservation plan.
Reintroduction of fish is to begin in 2020 or 2021.