Which is the fastest fish?

The sailfish, named for the large dorsal fin it can raise like a sail, is generally regarded as the fastest fish in the ocean, reaching short bursts estimated up to around 100 kilometres per hour. Its streamlined, torpedo-shaped body and powerful tail let it accelerate rapidly to hunt smaller fish. Sailfish often work together to herd prey, and they can rapidly change colour to communicate and confuse their targets. Some other billfish, like marlin, are also among the swiftest swimmers.