The Judas Fish: Leading Invasives to Slaughter

In Montana’s glacial lakes, biologists deploy an unusual weapon to defend native bull trout against an invader.

lake-trout
It’s spring, but frost covers nearly half the boat ferrying Clint Muhlfeld and his crew across Quartz Lake, high in the mountains of Montana’s Glacier National Park. They hiked 6 miles to meet the flat-bottomed skiff — which was strapped to the bottom of a helicopter and flown in — and carried nets, food, gear and gas because mules couldn’t cross the streams swollen with snowmelt. They’re here to tag an invasive species. The arduous trip is one of many biol...
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