Oceanic but seasonally coming close to shore and can tolerate a wide range of temperatures. They school by size, sometimes together with albacore, yellowfin, bigeye, etc. Prey on small schooling fishes (anchovies, sauries, hakes) or on squids and red crabs. Commercially cultured in Japan. Utilized fresh for sashimi, also canned. Become rare because of massive overfishing.
Western Atlantic: Canada, Gulf of Mexico, and the Caribbean Sea to Venezuela and Brazil. Eastern Atlantic: Lofoten Islands off Norway to Canary Islands, including the Mediterranean and the southern part of the Black Sea. Reported from Mauritania and off South Africa. Highly migratory species.