The porcupinefish (Diodon hystrix) is a species of fish that is found in the tropical and subtropical waters of the Atlantic, Pacific, and Indian Oceans. It is a small to medium-sized fish, typically reaching a maximum length of about 50 cm (20 inches).
The porcupinefish has a round, spiny body that is covered with small, sharp spines. Its body is typically brown, gray, or green in color, with darker bands or spots running down its sides. When threatened, the porcupinefish can inflate its body by taking in water or air, which makes it difficult for predators to swallow it.
Like other species of pufferfish, the porcupinefish is a slow-moving, opportunistic feeder that feeds on a wide variety of small invertebrates and plants. It is generally non-aggressive and is not considered a threat to humans, although it can deliver a painful bite if handled improperly.