Oncorhynchus masou

'salmon trout') or cherry trout (桜鱒, サクラマス, sakura masu) in Japan,[1][2] is a species of salmonid belonging to the genus Oncorhynchus, found in the North Pacific along Northeast/East Asian coasts from the Russian Far East (Primorsky, Kamchatka Peninsula, Sakhalin and Kuril Islands) to south through Korea, Japan and Taiwan.

Although generally accepted as a salmon in the West, the fish is actually regarded as a trout in Japan (its most famous native range) as it is the most commonly seen freshwater salmonid in the Japanese archipelago.

A masu salmon which has reached sexual maturity has a darkened back, and the stripes on the body sides become bright red with crimson tinge to merge on the abdomen into one common longitudinal band of lighter color.

[3] The maximum size that can be attained by this species (which is in the region of Primorsky Krai) is 71 cm (28 in) long and 9 kg (20 lb) in weight.

Emerging from the nest, the young do not travel to the sea immediately, but remain in spawning areas, in the upper reaches of rivers, and on shallows with weak currents.

Oncorhynchus masou
Grilled Amago as seen in Kokonoe