From fisheries, we can know about many types of fishes. Anadromous is one type of fish which migrate during their life cycle.
Anadromous fish are born in freshwater in the first stage of their lives. Then they migrate to the ocean as juveniles. This migration occurs so that they grow into adults into the sea. After becoming adults, they again migrate beck into the freshwater. They reproduce into the freshwater after migrating back into the freshwater from the sea.
So, we can say that there is two migration in the whole life cycle of anadromous fishes which is occurred so that they can reproduce.
