Answer: bullhead

AnswerCrossword Clue
BULLHEADFish that's part bovine?
bullheada freshwater catfish
bullheadA North American water lily with globular yellow flowers
bullheadA small, mainly freshwater Eurasian fish of the sculpin family, with a broad flattened head and spiny fins
bullheadAn American freshwater catfish with four pairs of barbels around the mouth