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Biwa Trout
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Salmoniformes
Family: Salmonidae
Genus: Oncorhynchus
Species: O. masou
Subspecies: O. m. rhodurus
Trinomial name
Oncorhynchus masou rhodurus
Jordan & McGregor, 1925

The Biwa trout or Biwa salmon, Oncorhynchus masou rhodurus, is an anadromous fish in the salmon family. It is one of several fish called trout but it is, according to taxonomists, a subspecies of the Cherry salmon. It is enzootic to Lake Biwa in Shiga Prefecture, Japan, and is found only in the waters of northern Lake Biwa.

The Biwa trout feeds on plankton, aquatic insects, freshwater prawn, lake prawn, worm, ayu and other small fishes and, sometimes, small mammals. Biwa trout represents a unique food fish for the Shiga prefecture. The fish has a reputation as being very difficult to catch by angling.




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.

Biwa trout as food

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.


See also

External links


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