'Marlin, family Istiophoridae, are fish with an elongated body, a spear-like snout or bill, and a long rigid dorsal fin, which extends forward to form a crest. Its common name is thought to derive from its resemblance to a sailor's marlin spike. Even more so than their close relatives the scombrids, marlin are incredibly fast swimmers, reaching speeds of about 110 kilometres per hour (68 mph). The larger species include the Atlantic blue marlin, Makaira nigricans, which can reach 5.968 metres (19.58 ft) in length and 818 kilograms (1,800 lb) in weight, and the Black marlin, Makaira indica, which can reach in excess of 5 metres (16 ft) in length and 670 kilograms (1,500 lb) in weight. They are popular sporting fish in tropical areas. Many sporting fishers like to try their luck at catching a massive marlin.''''''''''