Oncorhynchus rhodurus

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The Biwa trout, or Biwa salmon (Oncorhynchus biwaensis) 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. This species was previously identified to be same animal as Oncorhynchus (masuou) rhodurus which is first described from Lake Ashi. However, The Biwa trout was found to be a separate species from O. rhodurus and was described as a new species in 2025. O. rhodurus may represent a hybrid specimen instead. Biwa trout is found only in the waters of northern Lake Biwa, and feeds on plankton, freshwater prawns, aquatic insects, worms, ayu and other small fishes, and sometimes small mammals. 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.