The black redhorse (Moxostoma duquesni), (or duquesnii) is a species of freshwater fish endemic to Ontario and the eastern half of the United States, where it lives in streams and small to medium rivers. A bottom-feeder, it feeds on microcrustaceans, aquatic insects, detritus, and algae. The black redhorse spawns in the spring. This species has been identified as Threatened by the Committee on the Status of Endangered Wildlife in Canada (COSEWIC). It is currently being considered for listing under the federal Species at Risk Act (SARA).