Salmon are large pelagic fish that live primarily in the northern parts of the Pacific and Atlantic oceans, the Arctic Ocean and in the basins of rivers. The two most representative and abundant groups can be distinguished among the fish of the salmon family (Salmonidae): Atlantic salmon and Pacific salmon. The most distributed representative of Atlantic salmon is Salmo salar. The leading genus of Pacific salmon is Oncorhynchus, which includes pink salmon O. gorbuscha, chum salmon O. keta, sockeye O. nerka, coho O. kisutch, Chinook salmon O. tshawytscha (king salmon), and Sim O. masou. There are several species of the genus Salmo in the Pacific, but they are fewer in number compared with the Pacific salmon genus Oncorhynchus.