Breeding site for fish.

Fish reproduce in the environment where they live. It is an aquatic environment. But there are different ways of reproduction. Fish that lay eggs are forced to migrate frequently. This migration can even be from sea water to fresh water. Fry cannot appear without fertilization of the eggs. Male fish must fertilize the eggs with semen. Only from fertilized eggs can fry emerge. There are also viviparous fish. Then the male must fertilize the female fish. Usually these fish do not migrate to other places.