ⓘ Biwa trout

                                     

ⓘ Biwa trout

The Biwa trout 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 typically ranges from 40 to 50 cm from 16 to 20 in length and from 1.5 to 2.5 kg 3.3 to 5.5 lb in weight, although large specimens can be up to 28 70 cm in length and 5.0 11.0 kg lb in weight.

This fish feeds on plankton, aquatic insects, freshwater shrimp, worms, Ayu and other small fish and sometimes small mammals. It is found only in the waters of Northern lake Biwa.