Oncorhynchus masou, known as the masu salmon, masu, or the cherry salmon, is a species of salmon found in the Western Pacific Ocean along East Asia, ranging from the Kamchatka, Kuril Islands, Sakhalin, and Primorsky Krai south through Korea, ******, and Japan. A number of subspecies are known, including the anadromous, widespread masu Oncorhynchus masou masou (e.g. in Korea, Japan), the critically endangered, landlocked ******ese or *******n salmon Oncorhynchus masou *******nus found in certain freshwater systems of ******, the Biwa trout endemic of Lake Biwa, and the anadromous or stream-dwelling amago Oncorhynchus masou macrostomus restricted to western Japan.