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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 Xiphophorus ： ウィキペディア英語版 Xiphophorus ''Xiphophorus'' is a genus of euryhaline and freshwater fishes in the family Poeciliidae of order Cyprinodontiformes. The many ''Xiphophorus'' species are all called either platyfish (or platies) or swordtails. The type species is ''X. hellerii,'' the green swordtail. Platyfish and swordtails are live-bearers, meaning that they reproduce via internal fertilization. The name ''Xiphophorus'' derives from the Greek words ξίφος (dagger) and φόρος (bearer), referring to the gonopodium. The various ''Xiphophorus'' species are native to areas of Belize, Guatemala, Honduras, and especially Mexico. All small fishes, which reach maximum lengths of depending on the exact species.〔 Three species and their hybrids are common in the aquarium trade: the green swordtail (''X. hellerii''), the southern platyfish (''X. maculatus'') and the variable platyfish (''X. variatus''). IUCN lists two ''Xiphophorus'' species, the marbled swordtail (''X. meyeri'') and the northern platyfish (''X. gordoni''), as Endangered, while the Monterrey platyfish (''X. couchianus'') is listed as Critically Endangered. ==Human uses== ''Xiphophorus'' species are regularly used in genetic studies, and scientists have developed many interspecific hybrids.〔http://www.xiphophorus.txstate.edu/stockcenter/galleries/hybrid.html〕 The Xiphophorus Genetic stock center, founded by Myron Gordon in 1939, is an important source of these fish for research.〔http://www.xiphophorus.txstate.edu/about/introduction.html〕 In addition, several species are commonly kept by aquarium hobbyists, especially ''X. helleri'', ''X. maculatus'', and ''X. variatus.'' In fact, these are a key category in fishkeeping, a group of extremely hardy livebearing fish, along with the molly and guppy, that adapt to almost any water conditions, from cold to tropical, freshwater to fully marine. Unlike some species, these are available almost completely as captive-raised, because of the ease with which they breed. 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「Xiphophorus」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.