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.
“This is the first time in 50 years … that there have been westslope cutthroat trout in this lake,” said Humphries.
It took a decade for Humphries and her colleagues to start returning the native fish to the backcountry lake. “It seemed like it was working at first and then, after about four years, we realized that, actually, it wasn’t working. We were still getting a lot of reproduction in the introduced brook trout, so we had to change methods.”
“It breaks down really easily,” said Humphries, noting it doesn’t hurt birds or bears who eat the fish and it can also be deactivated by introducing another compound.
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