surgeonfish

Any of various brightly colored tropical marine fishes of the family Acanthuridae, having a laterally compressed body with one or more sharp erectile spines near the base of the tail, and often kept in home aquariums.

Any of many brightly coloured fishes, of the family Acanthuridae, that have an erect spine near the tail

brightly colored coral-reef fish with knifelike spines at the tail