This weekend, Yellowstone National Park updated its fishing regulations for this season. The changes have been made to better align the regulations with the park’s Native Fish Conservation Plan which seeks to eliminate non-native trout in most of the park’s lakes and tributaries. To help protect the native fish species, the limit on non-native fish caught in much of the park has been eliminated. During a recent visit to Jackson, Park Superintendent Dan Wenk explained that the trout are decimating the native cutthroat population. Wenk says a mature lake trout can eat 40 to 50 cutthroat trout each year. He adds that a single mature female lake trout will have about 900 eggs per pound of weight – so a nine-pound lake trout will lay over 800 eggs. Wenk says the park is working with telemetry with implants in the fish, trying to find out where they spawn, where they travel, how set nets to be most effective and other activities to eradicate the trout. The change includes all park waters except the Madison and Firehole rivers, the Gibbon River below Gibbon Falls, and Lewis and Shoshone lakes. Rainbow or brook trout caught in the Lamar River drainage must be harvested in order to protect native cutthroat trout in the headwater reaches of the drainage including Slough and Soda Butte Creeks. The directive also states that anglers must kill all lake trout caught in Yellowstone Lake to help cutthroat trout restoration efforts.