The Atlantic sailfish (Istiophorus albicans) is a species of marine fish in the family Istiophoridae of the order Perciformes. It is found in the Atlantic Oceans and the Caribbean Sea, except for large areas of the central North Atlantic and the central South Atlantic, from the surface to depths of 200 m (656 ft). The Atlantic sailfish is related to the marlin. Tests in the 1920s estimated that the Atlantic sailfish was capable of short sprints of up to 111 kilometres per hour; however, more conservative estimates of 37 to 55 kilometres per hour are more widely accepted.