Fishes that reproduce in fresh water and migrate out to sea as adults are considered:

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Fish that reproduce in fresh water and migrate out to sea as adults are considered anadromous, such as salmon and eels. Catadromous fish do the opposite, living in salt water and migrating to fresh water to breed. Polyandrous and polygynous refer to mating strategies and are not related to migration patterns. Demersal refers to fish that live near or on the ocean floor.

Fishes That Reproduce in Fresh Water and Migrate Out to Sea