sailfish, (genus Istiophorus), (genus ), valued food and game fish of the family Istiophoridae (order Perciformes) found in warm and temperate waters around the world. The sailfish has a long, rounded spear extending from its snout but is distinguished from related species, such as marlins, by its slimmer form, long pelvic fins, and, most especially, its large sail-like dorsal fin. It is a deep blue fish, silvery below, with a bright blue, spotted dorsal fin. Size ranges to about 3.4 metres…