Controlling Invasive Fish: Waterfalls Control Spread Of Lake Trout In Glacier National Park

Natural barriers like waterfalls play an important role in preventing lake trout from spreading through Glacier National Park, so maintaining those barriers should be a priority, researchers said after conducting a four-year study in the park. Park workers might have to remove ice, logs or debris to keep the water from rising behind those barriers. If they don't, lake trout will have an easier time swimming up the rivers and invading new lakes.