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Yaqui chub
The Yaqui chub (''Gila purpurea'') is a species of freshwater fish in the Cyprinidae family.
It is found in northern Mexico and the United States. The Yaqui chub is a medium-sized minnow fish that historically occurred in streams of Rios Matape, Sonora, and the Yaqui systems of Sonora, Mexico. It is one of the five species of the ''Gila'' genus in Arizona. The Yaqui chub is closely related to ''G. ditaenia'' (of Sonora, Mexico), and ''G. orcutti'' (of the Los Angeles Plain in California); and shares several physical characteristics with the'' G. orcutti'' (Arroyo chub), but proves different by having a black wedge near the base of the caudal fin.
==Description==
The Yaqui chub has a short and rounded snout, which causes the mouth to be small and slightly subterminal. It has large eyes placed on a thick head, placed on a deep body. This is different from the posterior portion of the body, which is much thinner. The Yaqui chub has enlarged scales that are roughly imbricated. Coloration is usually dark overall, but sometimes has a lighter underside. The Yaqui chub's lateral bands are underdeveloped, making them quite difficult to observe. However, a vertically placed, triangle-shaped spot is usually present on the caudal fin.〔Minckley, W.L. 1973. Fishes of Arizona. Arizona Game and Fish Department, Phoenix. pp. 107-108.〕
Very few Yaqui chub can grow to about 17.8 cm (7 in) long, while the average length of this fish is less than 13 cm (5.1 in) long.〔Rinne, J.N., and W.L. Minckley. 1991. Native fishes of arid lands: a dwindling resource of the desert southwest. U.S. Department of Agriculture, Forest Service, General Technical Report RM-206. Rocky Mountain Forest and Range Experiment Station, Fort Collins, Colorado.〕 Juveniles are usually 40–50 mm (1.6–2 in).
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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