Porcupinefish

Porcupinefish are fish belonging to the family Diodontidae (order Tetraodontiformes), also commonly called blowfish and, sometimes, balloonfish and globefish. They are sometimes collectively called pufferfish, not to be confused with the morphologically similar and closely related Tetraodontidae, which are more commonly given this name.

Porcupinefish have the ability to inflate their bodies by swallowing water or air, thereby becoming rounder. This increase in size (almost double vertically) reduces the range of potential predators to those with much bigger mouths. A second defense mechanism is provided by the sharp spines, which radiate outwards when the fish is inflated.

It prefers living alone near reefs, caves or ledges, hunting crustaceans and molusks at night. It can grow up to 36 inches, but is usually found as an adult at around 16 inches. Because it secretes a toxin, it’s not considered a food catch, but some are caught for the aquarium trade.

The porcupinefish is a shy creature and will retreat if approached by divers. They secrete a toxic skin substance so are usually considered poisonous, although they have been known to be eaten in Hawaii and Tahiti. In the orient the dried, inflated bodies are sold as tourist novelties.

Porcupinefish (Diodon hystrix) gets its name from the numerous long spines located all over the head and body. There are approximately 20 spines in a row between the snout and dorsal fin. It is a member of the puffer fish family Diodontidae.