Fisheries and Aquatic Sciences Program

Chart detailing Fisheries Program at Yellowstone.
Conceptual model of the fisheries program at Yellowstone National Park.


An NPS boat heads out on the water.
The Yellowstone National Park fisheries gillnetting boat on Yellowstone Lake.

NPS Photo by Todd Koel

Over the past decade, the aquatic resources of Yellowstone National Park, and the ecosystems they support, have become seriously threatened by introductions of non-native (from elsewhere in North America) and exotic (from another continent) species. For the foreseeable future, the Fisheries Program will focus the greatest amount of effort possible on conducting activities that are aimed at supporting its two main priorities:

NPS staff working on boat.
Yellowstone National Park fisheries biologists setting gillnet from a large boat on Yellowstone Lake.

Zac Sexton

  • Preservation of Yellowstone Lake cutthroat trout, which is the largest remaining concentration of inland cutthroat trout in the world; and
  • Restoration of fluvial populations of native trout, many of which have been lost due to introductions of non-native species.

The specific activity currently conducted to preserve Yellowstone Lake cutthroat trout is the lake trout suppression program, which is one of the largest non-native fish removal programs occurring in the United States. Activities related to the restoration of fluvial populations of native trout include the westslope cutthroat trout restoration in the East Fork Specimen Creek watershed. Also, prioritization of streams based on their potential for restoration success has been completed and will allow us to move forward with planning for restoration of Yellowstone cutthroat trout in streams of the park’s Northern Range.

Two NPS staff in yellow safety suits on raft in lake.
Yellowstone National Park fisheries biologists dressed in chemical suits in a small raft on High Lake.

NPS Photo by Jeff Arnold

Most of the activities related to restoration of fluvial populations of native trout are financially supported by the Fisheries Fund Initiative of theYellowstone Park Foundation, a non-profit organization whose mission is to fund projects and programs that protect, preserve and enhance Yellowstone National Park.

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Contact the Park

Mailing Address:

P.O. Box 168
Yellowstone National Park, WY 82190-0168


(307) 344-7381
Recorded information. For road and weather information, please dial 307-344-2117.

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