Gallatin River
The mountain whitefish "(Prosopium williamsoni)" is native to the park in the Madison River drainage, the Gallatin River drainage, the Yellowstone River below Knowles Falls, the Middle Creek tributary of the Shoshone River and the Snake River drainage. Attempts to introduce mountain whitefish into the Yellowstone River below Yellowstone Lake were unsuccessful. Native mountain whitefish survive very well in the presence of introduced trout species.