A spear-nosed apex predator of the open Atlantic, one of the most coveted big-game fish in the world.
Where it lives
Atlantic blue marlin inhabit warm pelagic waters across the tropical and subtropical Atlantic. They follow temperature fronts, current edges, and submarine seamount features that concentrate baitfish. Adults rarely descend below the thermocline; they cover thousands of kilometers each year.
How to recognise it
A massive, deep-bodied billfish with a long, round spear (cross-section circular, distinguishing it from swordfish). The back is cobalt blue, the flanks silvery white, often with pale vertical bars that flash in life. A tall first dorsal fin tapers rearward — far shorter than the sail-like fin of a sailfish.
Diet & behavior
Apex pelagic predators that stun and disable schools of tuna and dolphinfish by slashing with their bill before returning to feed. Females grow much larger than males — record fish over 800 kg are female.
Fisheries & Conservation
Listed as Vulnerable. Heavy longline bycatch and targeted fishing have depressed Atlantic stocks; modern sport fisheries practice near-universal catch-and-release.