Fugu

Fugu, or the Tiger Puffer (Takifugu rubripes), is a member of the pufferfish family Tetraodontidae native to the coastal waters of East Asia, particularly the Sea of Japan, Yellow Sea, and East China Sea. It is the most well-known member of the genus Takifugu, a group of puffers named for their capacity to inflate rapidly by drawing water into an elastic stomach when threatened. Like other tetraodontid pufferfish, its internal organs contain potent tetrodotoxin, a biological defense compound that deters predators. The species inhabits temperate coastal and shelf waters and undertakes seasonal migrations between deeper offshore wintering grounds and shallower coastal spawning areas.

Distinguishing features of the Tiger Puffer include:

• Stout, cylindrical body tapering toward the tail
• Dark grey-brown to blue-black dorsal coloration scattered with small white spots
• Pale cream to white belly
• No pelvic fins, and small, rounded dorsal, anal, and pectoral fins set far back on the body
• Fused, beak-like teeth forming a hard biting plate

Adults can reach up to about 80 cm, though most individuals encountered are smaller. Its ability to inflate into a near-spherical shape when disturbed, combined with the fine white spotting on a dark back, helps separate it from other regional Takifugu species.

Tiger Puffers inhabit temperate coastal and continental shelf waters of the northwestern Pacific, primarily around Japan, the Korean Peninsula, and coastal China, in the Sea of Japan, Yellow Sea, and East China Sea. They are typically found from nearshore shallows down to around 100 m, depending on season. The species undertakes a seasonal migration pattern, moving into shallow coastal and estuarine areas in spring to spawn before returning to deeper offshore waters as temperatures cool in autumn and winter. This migratory behavior links coastal nursery habitat with deeper continental shelf environments across its range.

Tiger Puffers are solitary to loosely social, most active in coastal waters during warmer months when they move inshore to spawn. Their primary defense is rapid inflation, drawing water into a highly elastic stomach to swell the body, making the fish difficult for predators to swallow; if removed from water, it can inflate with air as well. Diet consists mainly of small crustaceans, mollusks, and fish, crushed using its hard, fused beak-like teeth. Spawning occurs in shallow coastal waters, typically over sand or gravel, with adults gathering seasonally before returning to deeper offshore habitat for the remainder of the year, a pattern typical of many temperate Takifugu species.