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Bonytail chub
The bonytail chub or bonytail, ''Gila elegans'', is a cyprinid freshwater fish native to the Colorado River of Arizona, California, Colorado, Nevada and Utah in the southwestern United States. It was once abundant and widespread in the basin, its numbers and range have declined to the point where it has been listed as endangered (1980), a fate shared by the three other large Colorado basin endemic fish species: Colorado pikeminnow, Humpback chub, and Razorback sucker. It is now the rarest of the endemic big-river fishes of the Colorado River. There are 14 species of the genus, 7 of which are in Arizona.
==Description==
A bonytail chub can grow to over 2 feet (60 cm) long. Like many other desert fishes, its coloring tends to be darker above and lighter below, serving as a camouflage. Breeding males have red fin bases. They have a streamlined body and a terminal mouth. Bonytail Chubs have bodies that sometimes arch into a smooth, predorsal hump (in adults). While their skull is quite concave, their caudal peduncle (tailside) is thin, and almost looks like a pencil (hence, “bony tail”). The coloration of Bonytail Chubs is usually dark dorsally and lighter ventrally, however, in very clear waters, they looks almost black all over. 〔 Minckley, W.L. 1973. Fishes of Arizona. Arizona Game and Fish Department, Phoenix. pp. 95-96.〕 During breeding season, males and females have distinct coloration as well. Mature males have bright red-orange lateral bands between their paired fins; while females have a more subdued coloration that is described with the males.
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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