Noun | 1. | ![]() fish genus - any of various genus of fish Clupeidae, family Clupeidae - herrings; shad; sardines; etc. shad - herring-like food fishes that migrate from the sea to fresh water to spawn Alosa pseudoharengus, Pomolobus pseudoharengus, alewife - shad-like food fish that runs rivers to spawn; often salted or smoked; sometimes placed in genus Pomolobus |