Frigate Mackerel

The frigate mackerel, or frigate tuna (Auxis thazard), is a small, fast-swimming member of the tuna family Scombridae, found in warm tropical and subtropical waters worldwide. It is closely related to the bullet tuna and is often confused with it due to similar size and shape. Frigate mackerel form large schools in open ocean waters, frequently associating with drifting objects, seamounts, and other pelagic species. As a small, abundant schooling fish, it plays a significant ecological role as prey for larger tunas, billfish, and sharks. The species is widespread and currently considered stable throughout its extensive range.

Frigate mackerel closely resemble small tunas but show specific markings.

• Body: short, deep, and rounded, more compact than true mackerels
• Back: distinctive dark, oblique wavy tiger-stripe pattern confined to the upper back above the lateral line
• Scales: present only on a small corselet patch near the head; rest of body is naked and smooth
• Fins: widely separated dorsal fins, tiny finlets near the tail, prominent keels on the caudal peduncle
• Size: usually 25-40 cm

Frigate mackerel is distinguished from the closely related bullet tuna by more oblique, elongated back markings and a naked body area extending further back.

Frigate mackerel are oceanic, epipelagic fish found in tropical and warm-temperate waters across the Atlantic, Indian, and Pacific Oceans, typically between about 25 m and the surface, occasionally deeper. They favor open blue water far from the coast, often congregating around floating debris, seamounts, drifting weed lines, and current edges where small prey concentrates in dense patches. The species is highly migratory, moving with seasonal changes in sea surface temperature and generally avoiding cooler waters below about 20°C. Large schools frequently range across entire ocean basins, tracking warm currents and productive frontal zones throughout the year.

Frigate mackerel are fast, highly active schooling fish that often form large, dense aggregations, sometimes numbering in the thousands, and frequently mix with other small tunas. They feed opportunistically on small crustaceans, larval fish, and plankton near the surface, using bursts of speed to capture prey. Spawning occurs in warm offshore waters, typically during the warmest months of the year, with batches of small pelagic eggs released repeatedly through the season. As one of the most abundant small pelagic predators in tropical oceans, frigate mackerel form a critical prey base for larger tunas, billfish, seabirds, and sharks.