Kawakawa

Kawakawa (Euthynnus affinis), also known as the Indo-Pacific little tunny, is a compact, fast-swimming member of the tuna family Scombridae found throughout coastal tropical and subtropical waters of the Indian and western Pacific Oceans. It is a smaller relative of true tunas, closely related to the Atlantic little tunny and mackerel tuna. Kawakawa form large schools near coastlines, islands, and reef edges, often mixing with other small tunas. It is one of the most commonly encountered coastal pelagic fish across its range and supports substantial small-scale fisheries throughout Southeast Asia, the Indian Ocean, and the western Pacific. The species remains abundant and is not currently considered at risk.

Kawakawa can be identified by a combination of back pattern and distinctive spotting.

• Body: stocky, robust, rounded, typical of the Euthynnus genus
• Back: dark blue-black with narrow, broken, wavy oblique stripes above the lateral line
• Flank spots: several small dark spots located low on the body between the pectoral and pelvic fins, a key diagnostic feature
• Fins: yellow finlets edged in black along the back and belly near the tail
• Scales: present only on the corselet near the head, rest of body naked
• Size: typically 50-80 cm

The combination of wavy back stripes plus the row of dark spots near the pectoral fin base separates kawakawa from frigate mackerel, which lacks these spots.

Kawakawa are found throughout tropical and warm-temperate coastal waters of the Indian and western Pacific Oceans, from East Africa and the Red Sea across South and Southeast Asia to Japan, Australia, and the central Pacific islands. They are primarily a nearshore, epipelagic species, typically occurring within about 50 m of the surface near coastlines, reefs, and islands, though they can range further offshore. Kawakawa favor warm waters generally above 20°C and are commonly encountered in bays, lagoons, and along reef drop-offs.

Kawakawa are highly active, fast-swimming schooling fish, often forming large surface-feeding aggregations near coastlines and reefs, sometimes joining mixed schools with other small tunas. They are opportunistic predators, feeding on small schooling fish, squid, and crustaceans, frequently creating visible feeding frenzies at the surface. Spawning occurs in warm coastal waters over an extended season, with females releasing numerous small pelagic eggs in batches. As abundant coastal predators, kawakawa play a key ecological role linking small forage species to larger pelagic predators and are important prey themselves for sharks and larger tunas.