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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Gila nigra ： ウィキペディア英語版 Gila nigra The Headwater Chub (''Gila nigra'') is a species of fish in the Cyprinidae family. It is found in Arizona and New Mexico. ==Description== The body of the Headwater Chub is thick and chunky to streamlined but not markedly attenuate. The maximum size of the male fish is about 50 cm females are about 10–18 cm total length. The coloration of the fish is dark olive-gray or brown above, with a silver side, and white below. The longitudinal stripes are often diffuse, and are rarely with dark dorsal-lateral blotches. The caudal peduncle is not pencil-like, its length is less than its head length; the fins are small to moderate in size, sometimes convex, and are rarely curved, with inter-radial membranes of fins variously pigmented. Scales are developed and cover the entire body, with the basal radii variable. There are 73-83 lateral scales, with usually 8 dorsal and anal fin rays, and rarely 7 or 9 fin rays.〔Minckley, W.L. and B.D. DeMarais, 2000. ''Taxonomy of Chubs (Teleostei, Cyprinidae, Genus Gila) in the American Southwest with comments on conservation''. ''Copeia'', 2000(1), pp. 251-256.〕 Similar species include the Humpback Chub (''Gila cypha'') and Bonytail Chub (''G. elegans''), however, these fish have extremely slender caudal peduncles, smaller eyes, angle along anal fin base continuing above the caudal fin. Large individuals have a hump on their nape, and a depressed head which is absent on the Headwater Chub. ''Gila Nigra'' are somewhat trout-like in appearance, except they lack an adipose fin. Not surprisingly, they are morphologically intermediate between the Roundtail chub (''Gila robusta'') and the Gila chub (''Gila intermedia'').〔 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「Gila nigra」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.