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.
Adult Biwa trout usually range from 40 to 50 cm (16 to 20 in) in length and 1.5 to 2.5 kg (3.3 to 5.5 lb) in weight although, large specimens can be up to 70 cm (28 in) long and 5.0 kg (11.0 lb) in weight.
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.
- Froese, Rainer, and Daniel Pauly, eds. (2010). Oncorhynchus rhodurus in FishBase. April 2010 version.
- Yoshikazu Fujioka Profile of Biwamasu Trout and Seasons of The Mountain Village. www.hi-ho.ne.jp
- Biwa trout information from the National Institute for ES of Japan (Japanese)
- Fishing info. of Biwa trout (Japanese - at Archive.org)
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