CORRECTS YEAR IMAGE WAS TAKEN TO 2013, NOT 2003 - In this photo taken in 2013 and released by the National Park Service. Brian Ertel, a fisheries biologist at Yellowstone National Park, holds a netted lake trout caught from Yellowstone Lake in Wyoming. Scientists say they voracious species of trout that entered Yellowstone Lake and decimated its native trout population appears to be in decline following efforts to kill off the invading fish. (AP Photo/National Park Service)
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