Temporal range: Miocene–Recent
The Exocoetidae are a family of marine fish in the order Beloniformes of class Actinopterygii. Fish of this family are known as flying fish. About 64 species are grouped in seven to nine genera. Flying fish can make powerful, self-propelled leaps out of water into air, where their long, wing-like fins enable gliding flight for considerable distances above the water's surface. This uncommon ability is a natural defense mechanism to evade predators.
The oldest known fossil of a flying or gliding fish, Potanichthys xingyiensis, dates back to the Middle Triassic, 235–242 million years ago. However, this fossil is not related to modern flying fish, which evolved independently about 66 million years ago.
The term Exocoetidae is not only the present scientific name for a genus of flying fish in this family, but also the general name in Latin for a flying fish. The suffix -idae, common for indicating a family, follows the root of the Latin word exocoetus, a transliteration of the Ancient Greek name ἐξώκοιτος. This means literally "sleeping outside", from ἔξω "outside" and κοῖτος "bed", "resting place", so named as flying fish were believed to leave the water to sleep on the shore.
Distribution and description
Flying fish live in all of the oceans, particularly in tropical and warm subtropical waters. Their distinguishing feature is their pectoral fins, which are unusually large, and enable the fish to hide and escape from predators by leaping out of the water and flying through air a few feet above the water's surface. Research has suggested that difficult environmental factors in the flying fish's habitat has led to the evolution of modified fins. 
To glide upward out of the water, a flying fish moves its tail up to 70 times per second. It then spreads its pectoral fins and tilts them slightly upward to provide lift. At the end of a glide, it folds its pectoral fins to re-enter the sea, or drops its tail into the water to push against the water to lift itself for another glide, possibly changing direction. The curved profile of the "wing" is comparable to the aerodynamic shape of a bird wing. The fish is able to increase its time in the air by flying straight into or at an angle to the direction of updrafts created by a combination of air and ocean currents.
Genus Exocoetus has one pair of fins and a streamlined body to optimize for speed, while Cypselurus has a flattened body and two pairs of fins, which maximize its time in the air. From 1900 to the 1930s, flying fish were studied as possible models used to develop airplanes.
In May 2008, a Japanese television crew (NHK) filmed a flying fish (dubbed "Icarfish") off the coast of Yakushima Island, Japan. The creature spent 45 seconds in flight. The previous record was 42 seconds.
The flights of flying fish are typically around 50 meters (160 ft), though they can use updrafts at the leading edge of waves to cover distances of up to 400 m (1,300 ft). They can travel at speeds of more than 70 km/h (43 mph). Maximum altitude is 6 m (20 ft) above the surface of the sea. Some accounts have them landing on ships' decks.
Fishery and cuisine
Flying fish are commercially fished in Japan, Vietnam, and China by gillnetting, and in Indonesia and India by dipnetting. Often in Japanese cuisine, the fish is preserved by drying. The roe of Cheilopogon agoo, or Japanese flying fish, is used to make some types of sushi, and is known as tobiko. It is also a staple in the diet of the Tao people of Orchid Island, Taiwan. Flying fish is part of the national dish of Barbados, cou-cou and flying fish.
In the Solomon Islands, the fish are caught while they are flying, using nets held from outrigger canoes. They are attracted to the light of torches. Fishing is done only when no moonlight is available.
Barbados is known as "the land of the flying fish", and the fish is one of the national symbols of the country. Once abundant, it migrated between the warm, coral-filled Atlantic Ocean surrounding the island of Barbados and the plankton-rich outflows of the Orinoco River in Venezuela.
Just after the completion of the Bridgetown Harbor / Deep Water Harbor in Bridgetown, Barbados saw an increase of ship visits, linking the island to the world. The overall health of the coral reefs surrounding Barbados suffered due to ship-based pollution. Additionally, Barbadian overfishing pushed them closer to the Orinoco delta, no longer returning to Barbados in large numbers. Today, the flying fish only migrate as far north as Tobago, around 120 nmi (220 km; 140 mi) southwest of Barbados. Despite the change, flying fish remain a coveted delicacy.
Many aspects of Barbadian culture center around the flying fish: it is depicted on coins, as sculptures in fountains, in artwork, and as part of the official logo of the Barbados Tourism Authority. Additionally, the Barbadian coat of arms features a pelican and dolphin fish on either side of the shield, but the dolphin resembles a flying fish. Furthermore, actual artistic renditions and holograms of the flying fish are also present within the Barbadian passport.
In recent times, flying fish have also been gaining in popularity in other islands, fueling several maritime disputes. In 2006, the council of the United Nations Convention on the Law of the Sea fixed the maritime boundaries between Barbados and Trinidad and Tobago over the flying fish dispute, which gradually raised tensions between the neighbours. The ruling stated both countries must preserve stocks for the future. Barbadian fishers still follow the flying fish southward. Flying fish remain an important part of Barbados' main national dish.
- Oldest flying fish fossil found in China Nature, News, 31 October 2012.
- Xu, Guang-Hui; Li-Jun Zhao, Ke-Qin Gao and Fei-Xiang Wu (2012) A new stem-neopterygian fish from the Middle Triassic of China shows the earliest over-water gliding strategy of the vertebrates" Proceedings of the Royal Society B: Biological Sciences, Published online before print October 31, 2012. doi:10.1098/rspb.2012.2261
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