### Identification The Atlantic Bonito (*Sarda sarda*) is the sleek, silver-sided speedster of the Atlantic. It possesses a classic "torpedo" or fusiform shape, built for high-velocity bursts. Look for its most defining field mark: 7 to 11 dark, slightly slanted (oblique) stripes running across its steel-blue upper back. To distinguish it from the similar Skipjack Tuna, look at the belly; the Bonito is clean and silvery below the lateral line, whereas the Skipjack carries its stripes on its stomach. Additionally, the Bonito has a noticeably larger mouth filled with small, sharp teeth—a "toothy" grin that its tuna cousins lack.
### Habitat & Range This is a wide-ranging pelagic species found throughout the temperate and tropical Atlantic, from the stormy waters off Nova Scotia down to Argentina, as well as the Mediterranean and Black Seas. While they roam the open ocean, they are famously "coastal" for a scombrid, frequently appearing in large numbers near jetties, estuaries, and sandy beaches where the water is between 12°C and 27°C.
### Behaviour Observers will most likely spot the Bonito during a "blitz." They are aggressive, schooling predators that hunt with a frantic energy, often driving baitfish to the surface until the water appears to be "boiling." They are diurnal hunters, relying on keen eyesight in the upper water column. During the spring and summer, they migrate poleward in massive schools to follow the warming currents and spawning baitfish.
### Diet The Bonito is a relentless carnivore. It primarily targets small, schooling forage fish like anchovies, menhaden, and silversides, though it will readily snap up squid or shrimp. They are "ram-feeders," often charging through a school of prey with their mouths agape to seize multiple targets in a single pass.
### Fascinating Fact The Atlantic Bonito is a creature of "forced" perpetual motion. Unlike many other fish, it lacks a functional swim bladder. This means the Bonito must swim every second of its life from the moment it hatches; if it stops moving, it will not only sink to the bottom but will also suffocate, as it relies on its forward momentum to push oxygen-rich water over its gills.