Noun
spines become erect when the body is inflated; worldwide in warm waters
Source: WordNetThey are generally slow. citation Porcupinefish have the ability to inflate their bodies by swallowing water or air, thereby becoming rounder. Source: Internet
Porcupinefish are fish belonging to the family Diodontidae (order Tetraodontiformes ), also commonly called blowfish and, sometimes, balloonfish and globefish. Source: Internet