“I thought, Oh my god, this is the end.” ( Read our feature story about Yellowstone in the magazine.) “It was like somebody hitting me in the gut,” says Gresswell, an emeritus research scientist with the U.S. A park ranger walked up holding an 18-inch trout with a grey-green body, white spots and forked tail caught by a fisherman earlier that day. It was the summer of 1994, and he was doing research on the ecology of Yellowstone Lake. ( Read why lake trout are bad news for Yellowstone Lake.) The beginningīob Gresswell remembers the first lake trout found in Yellowstone Lake, the largest high-elevation lake in North America. This is the story of all the wild attempts to control these nonnative, voracious predators-and how biologists finally found the right solution. Photograph by CHARLIE HAMILTON JAMES, National Geographic Creative A lake trout, netted in Yellowstone Lake, and gutted as part of an eradication effort, was found to have eaten a cutthroat trout prior to being caught.
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