The Exocoetidae or flying fish are a marine fish family comprising about 50 species grouped in 7 to 9 genera. Flying fish are found in all of the major oceans, particularly in the warm tropical and subtropical waters of the Atlantic, Pacific, and Indian oceans. Their most striking feature is their pectoral fins, which are unusually large, and enable the fish to take short gliding flights through air, above the surface of the water, in order to escape from predators. Their glides are typically around 50m, but they can use updrafts at the leading edge of waves to cover distances of at least 400m.
Source: http://myamazingfact.blogspot.com/2009/06/flying-fish.html