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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 Common goldfish ： ウィキペディア英語版 Common goldfish The common goldfish, also known as feeder fish, is a type of goldfish with no other differences from their ancestors other than their color. Goldfish are a form of domesticated wild carp and are a close relative of koi.〔("Goldfish Fish Stats" )〕 Most varieties of fancy goldfish were derived from this simple breed.〔("Common Goldfish" )〕 Common goldfish come in a variety of colors including red, orange, yellow,white, black, and calico goldfish. ==Temperament== Common goldfish are social animals who prefer living in groups. They are able to interact with any fish belonging to the same species. With provision of adequate care and attention, common goldfish can become tame. Once familiar with the face of its owner, swimming towards the fish keeper during feeding time can be observed and hand-feeding becomes possible. Small goldfish will normally avoid any form of human contact. However, this fear ceases in a middle-sized and mature goldfish. A full-grown goldfish is more likely to eat directly from the hands of its owner without evident hesitation. While this behavior is welcomed by goldfish owners, it proved problematic in outdoor ponds where predators may eat such friendly prey. Mature goldfish will also explore their surroundings through nibbling or grazing behavior. If transferred into a tank of other goldfish, a common goldfish would normally try to communicate and familiarize itself with its new tank mates by rubbing up against the body of other fish. The most common introductory gesture would be by swimming side by side with another goldfish with its head facing forward, or by swimming side by side with another goldfish with its head facing the opposite direction, or even by swimming above another goldfish in a perpendicular fashion. Schooling is a common behavior when there is a new fish in the tank. After some time, this schooling behavior eventually ceases, and soon every individual fish will again be swimming and exploring the aquarium on its own. Aggressive behavior is uncommon when a new specimen is introduced into a settled school of goldfish. Hierarchy during feeding is commonly observed in which the larger goldfish receives most of the food. However, small goldfish may also become aggressive or competitive feeders despite the presence of larger fish which is, in general terms, considered a good sign, as a willingness to feed is indicative of a healthy goldfish. 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「Common goldfish」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.