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The spot-fin porcupinefish is a medium-sized fish which grows up to 91 cm, but the average size mostly observed is 40 cm. [2] Its body is elongated with a spherical head with big round protruding eyes, and a large mouth which is rarely closed.
The porcupine fish (as Diodon antennatus) is mentioned in Charles Darwin's famous account of his trip around the world, The Voyage of the Beagle. He noted how the fish can swim quite well when inflated, though the altered buoyancy requires them to do so upside down.
The fins lack spines and there are no pelvic fins, the dorsal fin has 12-14 rays, the anal fin has 11-14 rays, the caudal fin has 10 rays and there are 19-22 rays in the large pectoral fins. The body is covered in small spines which are triangular on cross section, some of which are reduced to plates under the skin.
The long-spine porcupine fish is an omnivore that feeds on mollusks, sea urchins, hermit crabs, snails, and crabs during its active phase at night. [5] They use their beak combined with plates on the roof of their mouths to crush their prey such as mollusks and sea urchins that would otherwise be indigestible.
Spot-fin porcupinefish: tropical and subtropical waters of the world, including the Mediterranean Sea Diodon liturosus G. Shaw, 1804: Black-blotched porcupinefish: tropical and subtropical waters of the Indo-Pacific area from eastern coasts of Africa to Japan Diodon nicthemerus G. Cuvier, 1818: Slender-spined porcupinefish
The Black-blotched porcupinefish is a medium-sized fish which grows up to 65 cm (26 in), but the average size most likely to be observed is 45 cm (18 in). [1] Its body is elongated with a spherical head with big round protruding eyes and a large mouth that is rarely closed.
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