Guineafowl Pufferfish

The Guineafowl Pufferfish (Arothron meleagris) is a large reef pufferfish in the family Tetraodontidae, named for its speckled pattern reminiscent of a guineafowl bird's plumage. It is widely distributed across the Indo-Pacific and into the eastern Pacific, including coral and rocky reefs from East Africa to the Americas. The species is notable for its variable color morphs: most individuals are dark brown to black with fine white spots, though a distinct solid yellow morph also occurs regularly. It feeds partly on live coral tissue, giving it a role as a coral predator on reefs. It is common and widespread, with no major conservation concerns.

• Large, rounded, plump body up to about 50 cm
• Most common form: dark brown to black with small, evenly spaced white spots
• Less common yellow morph: solid bright yellow, sometimes with faint spotting
• Large, high-set eyes and a blunt rounded snout
• Fused beak-like teeth forming four tooth plates
• No scales, pelvic fins, or lateral line; smooth thick skin
• Capable of inflating the body dramatically with water when threatened

Distinguished from similar Arothron species by the fine, uniform white spotting on dark skin (or the solid yellow morph), rather than large blotches or reticulated patterns.

Guineafowl Pufferfish occur across the Indo-Pacific and into the tropical eastern Pacific, from East Africa and the Red Sea through Southeast Asia and Oceania to the west coast of the Americas. They inhabit coral and rocky reefs, lagoons, and reef flats, typically at depths of 1-30 m, often near coral heads and areas with mixed hard and soft coral growth. They favor clear tropical water and are commonly seen resting in the open or hovering near reef structure during the day.

Guineafowl Pufferfish are generally solitary, slow-moving, and unhurried, often seen hovering in open water near reef structure rather than hiding. They feed opportunistically on a broad diet including coral polyps, sponges, tunicates, algae, and small invertebrates, using their fused beak-like teeth to bite off pieces of coral and hard prey. When threatened, they can rapidly inflate their body with water, deterring most predators, and their tissues contain tetrodotoxin as an additional chemical defense. They are not strongly territorial but will defend feeding areas from smaller fish, and their occasional coral-biting makes them a minor localized predator within reef ecosystems.