Porcupine Fish iPhone 5 Covers
Porcupinefish are fish of the family Diodontidae , (order Tetraodontiformes ), also commonly called blowfish (and, sometimes, "balloonfish " and "globefish ").
They are sometimes called pufferfish .
Porcupinefish are medium to large sized fish, and are found in shallow temperate and tropical seas worldwide. A few species are found much further out from shore, wherein large shoals of thousands of individuals can occur. They are generally slow.
Porcupinefish have the ability to inflate their body 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 defence mechanism is provided by the sharp spines, which radiate outwards when the fish is inflated. Some species are poisonous, having a tetrodotoxin in their internal organs, such as the ovaries and liver. This neurotoxin is at least 1200 times more potent than cyanide . Some scientists believe the poison is produced by several types of bacteria that are somehow obtained via the fish's diet, because fish bred in captivity are not poisonous, however, other scientists are sceptical of this theory. As a result of these three defences, porcupinefish have few predators, although adults are sometimes preyed upon by sharks and orcas . Juveniles are also preyed on by tuna and dolphins .
The UNIX -derived computer operating system OpenBSD uses a porcupine fish as its mascot, named Puffy .
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