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JERRY PAINTER Two summers ago, a gillnetting crew working to catch invasive lake trout on Yellowstone Lake pulled up its nets and found a small, hand-sized fish that sent shock waves through the fisheries biologists working to save threatened cutthroat trout in Yellowstone National Park. The small fish was a cisco, and it was far from its native waters, the Great Lakes. How the out-of-place fish got there is a guess because there are no natural connections, but the implications of another invasive fish gobbling up the same food sources needed by native Yellowstone cutthroat trout are profound. “(The cisco) was a 3-year-old female,” said Todd Koel, a Yellowstone fisheries biologist overseeing the park’s lake trout suppression project. “We did the otolith microchemistry work, essentially looking at the chemistry of the bone of the fish, and we determined that it was born in the lake, meaning that it has parents and it likely has thousands of siblings.

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