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Brook trout

An angler holds a brook trout caught in 2014 on Osage Lake near Newcastle. Yellowstone National Park fisheries biologists are working to remove brook and rainbow trout from the Upper Gibbon River drainage.

JACKSON (WNE) — 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.

The project, which runs until Sept. 13, is designed to scrub nonnative rainbow 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.

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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.

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The Upper Gibbon drainage includes Grebe, Wolf and Ice lakes and the streams that flow out from those waters. To make sure the nonnative rainbow and brook trout are wiped out, the treatments may be repeated in 2020. Reintroduction of fish is to begin in 2020 or 2021.

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