What is the fastest fish in the ocean?

Black marlin is the fastest fish. The swimming speed for this species of fish has been recorded as high as 129km/h (80 mph).

This species is mostly found in the Pacific and Indian Oceans. The subtropical and tropical regions are conducive to the survival of the black marlin fish. This species is one of the largest among the marlins and the bony fish.

Its main diet consists of cephalopods (octopuses, squid and cuttlefish) and various fishes. Black marlin is considered a recreational fish.

Sports fishers use this fish species for gaming purposes. For example, off the coast of Australia, the black marlin is mostly caught when there is moonlight. This kind of fish resides mostly in warmer regions of the ocean waters such as the Gulf of California, and mostly along the coasts rather than in the deep seas.

The second fastest fish is the sailfish. Experiments done in Florida, Long Key, recorded sailfish which leaped as high as 91 meters over 3 seconds. Such speed corresponds to 109km/h, (68 mph) however, it included leaping out of water which may not be treated as swimming.