The larval stage of the long‐toed salamander (Ambystoma macrodactylum) is the top vertebrate predator in high‐elevation fishless lakes in the North Cascades National Park Service Complex, Washington (U.S.A.). Although most of these high‐elevation lakes were naturally fishless, trout have been stocked in many of them. We sought to determine the effects of physicochemical factors and introduced trout on abundance and behavior of...