The redfin shiner (Lythrurus umbratilis) is a freshwater is a freshwater ray-finned fish belonging to the family Leuciscidae, the shiners, daces and minnows. The redfin shiner is most commonly found in the Ohio and Mississippi River basins, as well as in drainages of the Great Lakes. The diet of the redfin shiner consists mostly of algae and small insects. This species prefers calm water in low-gradient streams over substrates of gravel or sand with some vegetation.

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