Bonito

The Atlantic Bonito (Sarda sarda) is a member of the mackerel and tuna family Scombridae, found in temperate and subtropical waters of the Atlantic Ocean, including the Mediterranean and Black Seas. It is a close relative of the true tunas and mackerels, sharing their streamlined body and rapid swimming ability. Bonito are schooling coastal pelagic fish and important components of nearshore food webs, as well as popular light-tackle game fish. Several related bonito species occur in other oceans, distinguished mainly by subtle differences in stripe pattern and range.

Key field marks:

• Slender, spindle-shaped, streamlined body
• Steel-blue to greenish-blue back with several dark oblique stripes angled from back toward belly
• Silvery sides and belly without stripes
• Small finlets along the top and bottom near the tail
• Deeply forked, crescent-shaped tail
• Single, long-based first dorsal fin Bonito are distinguished from Spanish Mackerel by their oblique back stripes versus spots, and from small tunas by their more slender body and distinct striping pattern.

Atlantic Bonito inhabit temperate and subtropical coastal and offshore waters of the Atlantic Ocean, including the Mediterranean and Black Seas, typically near the surface within the upper 100 meters. They favor areas with strong currents, temperature fronts, and abundant baitfish, ranging from nearshore waters to the open continental shelf. Bonito undertake seasonal migrations, moving into cooler temperate waters during warmer months and retreating to more moderate temperatures as seasons change. They are often found in mixed schools alongside other pelagic species such as mackerel and small tunas.

Bonito are fast, schooling predators that hunt cooperatively, driving baitfish such as anchovies and sardines to the surface in energetic feeding frenzies. They are opportunistic feeders, also taking squid and crustaceans when available. Spawning occurs in warm coastal and offshore waters during spring and summer, with pelagic eggs and larvae dispersing with currents. As active mid-level predators, Bonito play an important ecological role linking smaller baitfish populations with larger pelagic predators such as tunas, billfish, and sharks that prey upon them.