The river redhorse (Moxostoma carinatum) is a species of freshwater fish endemic to the eastern half of the United States and southeastern Canada. They can range from 10 to 30 inches in length and can potentially reach a weight of more than 10 pounds after maturity. It is typically found in clear, large creeks and rivers, though it is sometimes also found in lakes. They are sometimes speared or caught with hook and line using crayfish or worms as bait.
A bottom-feeder, it feeds on mussels, snails, crustaceans and immature aquatic insects. Its common names include big-sawed sucker, river mullet, greater redhorse, redfin redhorse and redhorse sucker. It has the following characteristics:
Ov
OviparousOviparous animals are female animals that lay their eggs, with little or no other embryonic development within the mother. This is the reproductive...
No
Not a migrantAnimals that do not make seasonal movements and stay in their native home ranges all year round are called not migrants or residents.
R
starts withThe river redhorse occurs throughout the central and eastern Mississippi River System and the Gulf Slope from Florida to Louisiana. In Canada, its distribution is characterized by disjunct populations in southern Ontario and Quebec as well as Alberta. This species has declined considerably over much of its range in the last 200 years. Populations still occur in the Grand, Trent, Thames, Mississippi, Gatineau and Richelieu rivers, and recent data suggest a wider distribution in the Ottawa River than previously documented. However, this fish appears to no longer exist in the Châteauguay and Yamaska watersheds and has declined dramatically in the St. Lawrence River.
Due to its narrow range of habitat preferences, spawning requirements and intolerance of high turbidity, siltation and pollution, the river redhorse is susceptible to a number of threats. Hydroelectric development and flood control dams cause habitat fragmentation and alter habitat conditions, resulting in restricted movements of individual fish and limited gene flow between populations. Also, changes in flow regime and siltation of spawning habitats may reduce recruitment. Agricultural and municipal activities that affect water quality (increased sediment load, excessive nutrients) also adversely impact this species. Because of its sensitivity, it is used as an indicator species to gauge stream health.
