Salmon O.M. Formosanus in Taiwan Province Province (Jordan &; Oshima, 19 19): (only) distributed in Qijiawan Creek in the upper reaches of Dajiaxi in Taiwan. Ishikawa Ma Su Salmon O.M. Ishikawa E. Jordan &; MacGregor, 1925: distributed in the inland sea coast around Seto (central, western and southern Japan). O. m. masou (Brevoort, 1856): distributed in the coastal areas around the Sea of Japan (including the Japanese archipelago, the Korean Peninsula, the east coast of Siberia, Sakhalin Island and kamchatka peninsula). Ross Ma Su Salmon Om Rodus Jordan &; MacGregor, 1925: (only) distributed in Lake Biwako, Japan.