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Gravel chub
The gravel chub, also known as the spotted chub, and scientifically named ''Hybopsis x-punctata'' or ''Erimystax x-punctatus'', is a freshwater minnow from the family Cyprinidae. This species of fish has a spotted distribution inhabiting various small rivers and streams in North America. The gravel chub requires a highly specific clean habitat making it vulnerable to various types of pollutants and in need of conservation efforts.
==Description==
The gravel chub is a medium-sized minnow usually smaller than 10 cm. Its slender body is colored silver with an olive tint on the back and a white tint on the front, followed by a crosshatch pattern all over the scales.〔 The gravel chub is often misidentified as the streamline chub, the gravel chub can be distinguished from the streamline by the more defined crosshatch marking and lack of dark blotches along the lateral line, which runs straight from the anterior to posterior end of the fish. The gravel chub is also defined by its subterminal jaw with barbels extending from both of the upper and lower maxillary jaw bone. Their outer covering consists of small bony-ridged, cycloid scales (40–43 of these scales run along the lateral line) and a forked homocercal tail. Gravel Chubs are soft ray-finned fish and have no adipose fin. The pectoral fins are pointed made up of approximately 13-16 rays and located relatively low on the body, typical of primitive species. The pelvic fins are rounded, made up of eight rays and located further back posterior to the dorsal fin in the abdominal position. The caudal fin is moderately forked and pointed.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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