Puffers have loose skin lacking scales and pelvic
fins and knife-edged jaws composed of left and right plates above and
below. They feed upon a variety of invertebrates and inflate themselves with water to become more difficult for predators to
swallow or wedge themselves into a crevice. Spines are reduced to tiny
prickles but all parts of the fish contain deadly tetrodotoxin.
Primary locomotion is produced by sculling the dorsal, anal, and
pectoral fins, reserving the tail for sudden bursts. Porcupinefishes have stout spines or burrs and each jaw consists of a single