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The or sweetfish, ''Plecoglossus altivelis'', is an amphidromous fish, the only species in the genus ''Plecoglossus'' and family Plecoglossidae. It is a relative of the smelts, and is placed in the order Osmeriformes. Native to the Palearctic ecozone, it occurs in rivers, lakes, and coastal waters of western Hokkaidō in Japan southward to the Korean Peninsula, China, and Hong Kong. The species has become extinct in Taiwan since 1967, although there are populations of re-introduced Japanese stocks in some of the northern streams. The name "sweetfish" is due to the sweetness of its flesh. In reference to its typical one-year lifespan, it is also written as ("year-fish"). The ayu is the prefectural fish of Gunma Prefecture and Gifu Prefecture. ==Subspecies== Three subspecies are currently recognized, but their status is questioned and species may be monotypic: * ''P. a. altivelis'' (Temminck & Schlegel, 1846) (ayu, sweetfish) * ''P. a. chinensis'' Y. F. Wu & X. J. Shan, 2005 * ''P. a. ryukyuensis'' M. Nishida, 1988 (Ryukyu ayu-fish) 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「Ayu」の詳細全文を読む スポンサード リンク
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