1) Eels 1) Family anguillidae 2) Fish family 
The Anguillidae are a family of fishes that contains the freshwater eels. The 19 species and six subspecies in this family are all in genus Anguilla. They are catadromous, meaning they spend their lives in freshwater rivers, lakes, or estuaries, and return to the ocean to spawn. The young eel larvae, called leptocephali, live only in the ocean and...
[n] - eels that live in fresh water as adults but return to the sea to spawn
family Anguillidae noun eels that live in fresh water as adults but return to the sea to spawn