triggerfish

Any of various brightly colored fishes of the family Balistidae of warm coastal waters, having a roundish body and an erectile spine on the anterior dorsal fin that locks upright when the fish is threatened.

any of several brightly coloured fish, of the family Balistidae, that inhabit tropical reefs, and have an erectile spine on its dorsal fin

any of numerous compressed deep-bodied tropical fishes with sandpapery skin and erectile spines in the first dorsal fin