The Redside shiner (Richardsonius balteatus hydrophlox) is native to Yellowstone in the Snake River drainage, most commonly in lakes and ponds. It may also be native to lakes in the Fall River drainage. In the 1950s it was introduced into Yellowstone Lake and occurs today along the entire shoreline and in tributaries and lakes of the upper Yellowstone River. It was also introduced into Lewis Lake and now occurs in Shoshone Lake as well. These introductions into non-native waters were not official and has been attributed to the release of shiners being used as bait by fishermen.

Ref: Fishes of Yellowstone National Park