A white bucket sits in a creek flowing out of Hidden Lake — a cold alpine lake behind the Lake Louise Ski Resort in Banff National Park.
Inside the bucket, which has been turned into a remote streamside incubator with a few plumbing supplies, are dozens of tiny westslope cutthroat trout, a threatened species in Alberta.
The fish will join about 5,000 westslope cutthroat trout that have been released in Hidden Lake as part of a restoration project that started in 2011. It took a decade for Humphries and her colleagues to start returning the native fish to the backcountry lake. They turned to a natural fish toxicant called rotenone to treat the lake in 2018 and again in 2019. Rotenone, which is derived from the roots of a plant, has been used around the world — including national parks — to kill invasive fish.
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