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The sterlet (''Acipenser ruthenus'') is a relatively small species of sturgeon from Eurasia native to large rivers that flow into the Black Sea, Azov Sea, and Caspian Sea, as well as rivers in Siberia as far east as Yenisei. Populations migrating between fresh and salt water (anadromous) have been extirpated.〔 Due to overfishing (for its flesh, caviar, and isinglass), pollution, and dams, the sterlet has declined throughout its native range and is considered vulnerable by the IUCN.〔 Restocking projects are ongoing, and it has been introduced to some regions outside its native range, but the latter have generally not become self-sustaining.〔 Today, the majority of the international trade involves sterlets from aquaculture.〔 ==Physical appearance== *The sterlet may reach 16 kg in weight and 100 to 125 cm in length, rarely exceeding a length of 3 ft. *It is quite variable in coloration, but usually has a yellowish ventral side. *It is distinguishable from other European species of sturgeons by the presence of a great number of whitish lateral scutes, fringed barbels, and an elongated and narrow snout, highly variable in length. 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「sterlet」の詳細全文を読む スポンサード リンク
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