This pelagic and migratory species are found in tropical and warm temperate oceanic waters. Seasonal concentrations occur during trans-Atlantic migrations in the southwest Atlantic from January to April; in the northwest Atlantic from June to October; in the western and central North Pacific from May to October; in the equatorial Pacific in April and November, and in the Indian Ocean from April to October. Blue Marlin apparently grow larger in the Pacific. All giant marlins are females, and male blue marlin rarely exceed 300 pounds. They are known to feed on squid and pelagic fishes, including blackfin tuna and frigate mackeral. Fishing methods include trolling large whole baits such as bonito, dolphin, mullet, mackeral, bonefish, ballyhoo, flying fish as well as various types of artificial lures and sometimes strip baits.