This pelagic and highly migratory species occurs in all tropical and warm temperate oceanic waters .
In the Atlantic Ocean it is found from 45°N to 35°S, and in the Pacific Ocean from 48°N to 48°S. It is less abundant in the eastern portions of both oceans. In the Indian Ocean it occurs around Ceylon, Mauritius, and off the east coast of Africa. In the northern Gulf of Mexico its movements seem to be associated with the so called Loop Current, an extension of the Caribbean Current. Seasonal concentrations occur in the southwest Atlantic (5°-30°S) from January to April; in the northwest Atlantic (10°-35°N) from June to October; in the western and central North Pacific (2°-24°N) from May to October; in the equatorial Pacific (10°N-10°S) in April and November; and in the Indian Ocean (0°-13°S) from April to October.
Around Los Cabos they tend to show up in summer from around July and stay until late October, occasionally even early November. That said, there is often one or two large fish caught in wintertime.
Japanese longliners report that the Blue marlin is the largest of the istiophorid fishes. It apparently grows larger in the Pacific. All giant marlins are females, and male Blue marlin rarely exceed 300 lb (136 kg). The pectoral fins of Blue marlin are never completely rigid, even after death, and can be folded completely flat against the sides except in the largest specimens. The dorsal fin is high and pointed anteriorly (rather than rounded) and its greatest height is less than the greatest body depth. The anal fin is relatively large and it too is pointed. Juveniles may not share all the characteristics listed above, but the peculiar lateral line system is usually visible in small specimens. In adults it is rarely visible unless the scales or skin are removed. The vent is just in front of the anal fin, as it is in all billfish except the spearfish. The back is cobalt blue and the flanks and belly are silvery white. There may be light blue or lavender vertical stripes on the sides, but these usually fade away soon after death, and they are never as obvious as those of the striped marlin. There are no spots on the fins.
They are known to feed on squid and pelagic fishes, including tuna and dorado around Los Cabos. A powerful, aggressive fighter, they run hard and long, sound deep, and leap high into the air in a seemingly inexhaustible display of strength. Fishing methods include trolling large whole baits such as bonito, dorado, mackerel, ballyhoo, flying fish and squid as well as various types of artificial lures and sometimes strip baits.
Some taxonomists believe that the Atlantic and Pacific blue marlins are closely related but separate species. They apply the scientific name Makaira nigricans, to the Atlantic species only and the name Makaira mazara to the Pacific and Indian Ocean species. Others treat the two populations as subspecies, Makaira nigricans nigricans and Makaira nigricans mazara.
There is a massive statue of the largest Blue marlin ever recorded just by Captain Tony's on the marina at Cabo San Lucas.
Current Blue Marlin All Tackle Record
1376 lbs. 0 ounces.
Best time to catch a Blue marlin in Cabo : From July until early November.