No limit

The limit on non-native fish in Yellowstone National Park has been quashed in an advanced effort to preserve native fish. This applies to all park waters, except the Madison and Firehole rivers, the Gibbon below the falls, and Lewis and Shoshone lakes. Additionally, rainbows and brookies in the Lamar Drainage (including Slough and Soda Butte creeks) must be harvested, similar to the mandatory-kill-of-lake-trout rule in Yellowstone Lake. Bring your lemon juice.