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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 Green sturgeon ： ウィキペディア英語版 Green sturgeon The Green sturgeon (''Acipenser medirostris'') is a species of sturgeon native to the Pacific Ocean, from China and Russia, over into Canada and the United States. == Description == Sturgeons are among the largest and most ancient of ray finned fishes. They are placed, along with paddlefishes and numerous fossil groups, in the infraclass Chondrostei, which also contains the ancestors of all other bony fishes. The sturgeons themselves are not ancestral to modern bony fishes but are a highly specialized and successful offshoot of ancestral chondrosteans, retaining such ancestral features as a heterocercal tail, fin structure, jaw structure, and spiracle. They have replaced a bony skeleton with one of cartilage, and possess a few large bony plates instead of scales. Sturgeons are highly adapted for preying on bottom animals, which they detect with a row of sensitive barbels on the underside of their snouts. They protrude their very long and flexible “lips” to suck up food. Sturgeons are confined to temperate waters of the Northern Hemisphere. Of 25 extant species, only two live in California, the green sturgeon and the white sturgeon (''A. transmontanus''). (Moyle 2002) Green sturgeon is similar in appearance to white sturgeon, except the barbels are closer to the mouth than to the tip of the long, narrow snout. The dorsal row of bony plates numbers 8-11, lateral rows, 23-30, and bottom rows, 7-10; there is one large scute behind the dorsal fin as well as behind the anal fin (both lacking in white sturgeon). The scutes also tend to be sharper and more pointed than in white sturgeon. The dorsal fin has 33-36 rays, the anal fin, 22-28. The body colour of the white sturgeon is yellow with some pink instead of the green of the green sturgeon. Green sturgeon can reach 7 feet (210 cm) in length and weigh up to 350 pounds (159 kg). 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「Green sturgeon」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.