The fish of Yellowstone National Park, in Idaho, Montana and Wyoming (U.S.), include 13 native fish species and six introduced or non-native species. Angling for trout has been a pastime in the park since its creation and trout species dominate the fish inhabiting the park. When Yellowstone National Park was created in 1872, 40% of the park's waters were barren of fish, including most alpine lakes and rivers above major waterfalls. Only 17 of 150 lakes held fish.