Sailfish

The sailfish is one or two species of marine fish in the genus Istiophorus, part of the family Istiophoridae, the marlins. It is predominantly blue to gray in color and has a characteristically large dorsal fin, called the sail, that often stretches the entire length of its back, along with an elongated bill consistent with other marlins and the swordfish, together known as billfish in sport fishing. Sailfish live in the colder pelagic waters of all of Earth's oceans and hold the record for the highest speed of any marine animal.