. The Canadian field-naturalist. 1988 Parker: Updated Status of River Redhorse 141. Figure 1. River Redhorse, Moxostoma carinatum. Courtesy D. E. McAllister, National Museum of Natural Sciences; drawing by C. Douglas. redhorse species, and its actual distribution cannot easily be determined. The closest populations of River Redhorse in the United States are believed to be in Kentucky and Missouri approximately 1 300 kilometers southwest of populations in Canada. Protection International: The River Redhorse is listed as endangered in Kansas (Piatt 1974) and Ohio (Ohio Department of Natural Reso
. The Canadian field-naturalist. 1988 Parker: Updated Status of River Redhorse 141. Figure 1. River Redhorse, Moxostoma carinatum. Courtesy D. E. McAllister, National Museum of Natural Sciences; drawing by C. Douglas. redhorse species, and its actual distribution cannot easily be determined. The closest populations of River Redhorse in the United States are believed to be in Kentucky and Missouri approximately 1 300 kilometers southwest of populations in Canada. Protection International: The River Redhorse is listed as endangered in Kansas (Piatt 1974) and Ohio (Ohio Department of Natural Resources 1976), threa- tened in Florida (Gilbert 1978), and rare in Missouri. It is believed to have been extirpated from Michigan, much of Iowa, Illinois, Indiana, and Pennsylvania (Jenkins 1970). National: The River Redhorse is not specifi- cally protected in Canada, although fish habitat sections of the Fisheries Act of Canada do afford general protection. In April 1983, the Committee on the Status of Endangered Wildlife in Canada (COSEWIC) assigned and approved a status of rare for the River Redhorse (Parker and McKee 1984). Population Sizes and Trends River Redhorse specimens have been taken from widely separated locations within the Great Lakes basin suggesting that its distribution may have been more broad in the past. Today reproducing populations are known only from the Richelieu and Yamaska River basins in southern Quebec and the Mississippi River in eastern Ontario. Adult River Redhorse were recently identified by the Ontario Ministry of Natural Resources from the lower Mississippi River near its coinfluence with the Ottawa River, and I suggest that other populations may exist in the Ottawa River. Other reports of the River Redhorse in southern Ontario place the species in the Ausable River in the 1930s [Royal Ontario Museum (ROM) Record Number 28250]. The continued existence of this population is in doubt because of a lack of suitable habitat. Other species of redhorse
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