King mackerel are schooling fish with an enthusiastic following among sport fishermen in the Atlantic and Gulf of Mexico. There are separate stocks of king mackerel, one in the waters of the western Atlantic from Massachusetts to Brazil and the other in the Gulf of Mexico. King mackerel are fast, open-ocean and near-shore predators that feed on smaller fish, squid and shrimp, and grow to over four feet long. Weights up to 70 pounds are common, and the sport fishing record is 93 pounds, set off Puerto Rico. As of 2002, management measures for king mackerel in the Gulf of Mexico have been successful in allowing the biomass to increase; this stock is no longer subject to overfishing.