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Biwa trout
The Biwa trout (''Oncorhynchus rhodurus'') is an anadromous salmonid fish of the genus ''Oncorhynchus'', endemic to Lake Biwa in Shiga Prefecture, Japan, but also introduced to Lake Ashi and Lake Chūzenji. While called trout, the fish is most closely related to the masu salmon ''Oncorhynchus masou'' of the western Pacific, and is most often considered a subspecies of it, ''Oncorhynchus masou rhodurus''.〔( ''rhodurus, Oncorhynchus'' ) In: W. Eschmeyer: Catalog of Fishes Online Database. California Academy of Sciences. Downloaded 16 Feb 2015〕
Adult Biwa trout usually range from 40 to 50 cm in length and 1.5 to 2.5 kg in weight although large specimens can be up to 70 cm long and 5.0 kg in weight.
This fish feeds on plankton, aquatic insects, freshwater prawns, worms, ayu and other small fishes and, sometimes, small mammals. It is found only in the waters of northern Lake Biwa.
==Use as food==
Biwa trout represents a unique food fish for the Shiga prefecture. Biwa trout and its caviar are considered a delicacy. Usual ways to prepare the trout is as sashimi, by grilling with salt, in meuniere, or by smoking, deep-frying or simmering, ''etc''. The fish has a reputation as being very difficult to catch by angling.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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