Salmon

Salmon are fishes of the northern oceans and rivers, with many populations migrating from freshwater to the sea and later returning to spawn. Their bodies change as they grow and move between habitats. Some populations remain in freshwater throughout their lives. Young fish use rivers, streams or lakes before ocean-bound forms enter salt water. Returning adults carry marine nutrients into freshwater and surrounding habitats. Pacific and Atlantic salmon differ in details of their breeding cycles, so one species' life history does not describe them all.