The United States deliberately poisoned all 41 kilometers of Yellowstone's Soda Butte Creek in the 1990s, killing every fish in the river after invasive brook trout overwhelmed native cutthroat trout, and years later, the iconic native fish returned

It seems to be the plot of some environmental thriller. Wildlife officials used rotenone to remove fish from more than 41 kilometers of Soda Butte Creek in Yellowstone National Park, reviving a restoration strategy first used there in the 1990s.

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