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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). The black redhorse (Moxostoma duquesnei) is a member of the Sucker family (Catostomidae) and has the following characteristics: * Laterally compressed body. * Long rounded snout which overhangs inferior mouth. * Narrow upper lip and thick, slightly concave lower lip. * Has 43 to 51 lateral line scales. * Club-shaped pharyngeal teeth. * Dorsal surface and upper sides are grey or olive brown with a silver-blue overtone; sides are lighter and usually silvery blue; ventral surface is silver to milky white. * All fins are slate grey. * Scale edges are dark. * Females show little or no spawning colour, males have bold longitudinal stripes of black and colour (orange to pink) along their sides. * Maximum known length is 66 cm; maximum weight is 3.2 kg. see reference #1 == Distribution == The black redhorse has a wide, but disjunct, distribution in eastern North America. It is found from Alabama and Mississippi in the south to Ontario and Michigan in the north, and from New York in the east to Oklahoma and Minnesota in the west. In Canada, it is limited to southwestern Ontario where it occurs in only six watersheds. In the Lake Huron drainage, it is found in the Bayfield River, Maitland River and Ausable River watersheds. In the Lake Erie drainage, it is known from the Catfish Creek (extirpated) and Grand River watersheds. It is also present in the Thames River watershed in the Lake St. Clair drainage. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Black redhorse」の詳細全文を読む スポンサード リンク
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