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The Tosakin (土佐金) or curly fantail goldfish is a very distinctive breed of goldfish with a large tail fin that spreads out horizontally (like a fan) behind the fish. Though technically a divided tail, the two halves are attached at the center/middle forming a single fin. File:Tosakin.JPG|Tosakin viewed from the side It was developed in Japan, and is rarely seen in other countries.〔Johnson, Dr. Erik L. and Richard E. Hess. ''Fancy Goldfish: A Complete Guide to Care and Collecting'', Shambhala Publications, Inc., 2001. - ISBN 0-8348-0448-4〕 It is believed to have originally been developed from the ryukins.〔Andrews, Dr. Chris. ''An Interpet Guide to Fancy Goldfish'', Interpet Publishing, 2002 - ISBN 1-902389-64-6〕 ==Description== Although it has a body shaped similar that of other fantailed goldfish, its tail fin opens and spreads flat and wide horizontally with the leading edges flipping under once or even twice. Because of its large and broad tail, the Tosakin is a weak and even clumsy swimmer requiring it be kept in still water without a strong current. The Tosakin has been often and mistakenly reported by as a weak fish due to inbreeding, however in reality is as hardy as most other breeds of fancy, deep-bodied goldfish. Like many other deep-bodied goldfish, the Tosakin is especially prone to swim bladder problems. The Tosakin is considered a "top-view" fish and is traditionally kept in large shallow bowls or small ponds to be viewed from above. Seen from above, with its pointed head and deep, round trunk, the tail is obviously a flat half circle. Tosakins are metallic red, red and white or "uncolored" iron-black. Recently calico fish with Tosakin body conformations have been developed, but many purists have yet to recognize this coloration as a true Tosakin. The Tosakin is slow growing compared to most other breeds of fancy goldfish with a maximum attainable length of around eight inches. 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「Tosakin」の詳細全文を読む スポンサード リンク
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