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Yellowstone National Park: Nonnative brook trout discovered in Soda Butte Creek in park

in Regional
Yellowstone National Park: Nonnative brook trout discovered in Soda Butte Creek in park

Boiling River near Mammoth Hot Springs, Yellowstone National Park. PHOTO BY R. ROBNISON, PUBLIC DOMAIN

Boiling River near Mammoth Hot Springs, Yellowstone National Park. PHOTO BY R. ROBNISON, PUBLIC DOMAIN
EBS Staffby EBS Staff
August 4, 2023

By Daily Montanan Staff DAILY MONTANAN

Yellowstone National Park will resume the Soda Butte Creek Native Fish Restoration Project near the Northeast Entrance Aug. 14-18 to remove newly discovered nonnative brook trout, the park said Wednesday in a news release.

“If not addressed this month, brook trout will quickly displace native Yellowstone cutthroat trout and eventually invade the entire Lamar River watershed, threatening the largest remaining riverine population of Yellowstone cutthroat trout in existence,” the park said.

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The park said the fish restoration project concluded in 2016 after nonnative brook trout were completely removed from the waterway due to successful treatments.

The park will embark on the current project in coordination with Montana Fish, Wildlife & Parks and Custer Gallatin National Forest.

On Aug. 14-18, Soda Butte Creek will be closed to the public from the park boundary at the Northeast Entrance to Ice Box Canyon (9.6 miles) while biologists remove brook trout by applying an EPA-approved piscicide (rotenone). Warm Creek and Soda Butte Creek picnic areas will also be closed for project staging. View a map for details.

Cutthroat trout will be moved out of the treatment area the week of Aug. 7 by electroshocking. The salvaged cutthroat trout will be held in the Soda Butte Creek watershed in upper untreated tributaries.

Cutthroat trout will be released back into Soda Butte Creek once fisheries staff complete the treatment.

Cutthroat trout are the only trout species native to the park.

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“They are the most ecologically important fish of the Greater Yellowstone Ecosystem and are highly regarded by anglers,” the park said.

Genetically pure Yellowstone cutthroat trout populations have declined throughout their natural range in the Intermountain West, succumbing to competition with and predation by nonnative fish species, a loss of genetic integrity through hybridization, habitat degradation and predation.

Learn more about the Soda Butte fish restoration and ongoing preservation efforts at Native Fish Conservation Program.

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