Definitions for "Anadromous fish"
Fish that leave the freshwater where they were hatched and migrate to the ocean to live their adult life. They then return to the same freshwater tributaries where they were hatched to spawn, thereby completing their life cycle.
Fish that travel upstream (from their primary habitat in the ocean) to fresh waters in order to spawn.
(3) fish, such as salmon and steelhead, that hatch in fresh water, migrate to the ocean, mature there, and return to fresh water to reproduce.