The Sailfish (Istiophorus platypterus) is the fastest fish in the ocean, as it can sail at 68 mph (110 kph). That is almost as fast as a cheetah runs on dry land. It’s incredible that any animal underwater can reach these speeds. There are two main subspecies of sailfish: Atlantic and Indo-Pacific. They get their name from the dorsal fin that nearly spans the length of their bodies. They like to inhabit warm and temperate waters across the world. The average lifespan is only four years, so they quickly grow to adult size. They usually grow to around 10 ft (3 meters) long and between 120 and 220 pounds (54-100 kg) heavy. They feed on small fish like anchovies and sardines, as well as squid and octopus. They can use their sails to shepherd smaller fish into easy pickings.

Source: American Oceans