The Exocoetidae are a family of marine fish in the order Beloniformes class Actinopterygii, known colloquially as flying fish or flying cod. About 64 species are grouped in seven to nine genera. While they cannot fly in the same way as a bird does, flying fish can make powerful, self-propelled leaps out of water where their long wing-like fins enable gliding for considerable distances above the water's surface. The main reason for this behaviour is thought to be to escape from predators.
|Scientific classification |
The Exocet missile is named after them, as variants are launched from underwater, and take a low trajectory, skimming the surface, before striking their targets.
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 both the scientific name and 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", verb root κει- "to lie down" (not "untruth"), so named as flying fish were believed to leave the water to sleep ashore, or due to flying fish flying and thus stranding themselves in boats.
The Exocoetidae is divided into four subfamilies and seven genera:
- Subfamily Exocoetinae Risso, 1827
- Subfamily Fodiatorinae Fowler, 1925
- Subfamily Parexocoetinae Bruun, 1935
- Subfamily Cypsellurinae Hubbs, 1933
Distribution and description
Flying fish live in all of the oceans, particularly in tropical and warm subtropical waters. They are commonly found in the epipelagic zone, the top layer of the ocean to a depth of about 200 m (656 ft).
Numerous morphological features give flying fish the ability to leap above the surface of the ocean. One such feature is fully broadened neural arches, which act as insertion sites for connective tissues and ligaments in a fish's skeleton. Fully broadened neural arches act as more stable and sturdier sites for these connections, creating a strong link between the vertebral column and cranium. This ultimately allows a rigid and sturdy vertebral column (body) that is beneficial in flight. Having a rigid body during glided flight gives the flying fish aerodynamic advantages, increasing its speed and improving its aim. Furthermore, flying fish have developed vertebral columns and ossified caudal complexes. These features provide the majority of strength to the flying fish, allowing them to physically lift their bodies out of water and glide remarkable distances. These additions also reduce the flexibility of the flying fish, allowing them to perform powerful leaps without weakening midair. At the end of a glide, they fold their pectoral fins to re-enter the sea, or drop their tails into the water to push against the water to lift 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.
Species of genus Exocoetus have one pair of fins and streamlined bodies to optimize for speed, while Cypselurus spp. have flattened bodies and two pairs of fins, which maximize their 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 fish spent 45 seconds in flight. The previous record was 42 seconds.
The flights of flying fish are typically around 50 m (160 ft), though they can use updrafts at the leading edge of waves to cover distances 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. Flying fish often accidentally land on the decks of smaller vessels.
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 to be used as fish stock for dashi broth. 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. The taste is close to that of a sardine.
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 had 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 dolphinfish 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.
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.
- Fossilworks. "Exocoetidae".
- Richard van der Laan; William N. Eschmeyer & Ronald Fricke (2014). "Family-group names of Recent fishes". Zootaxa. 3882 (2): 001–230.
- "Recent Discoveries about the Evolution of Flying Fish | Bio-Aerial Locomotion". Retrieved 2019-09-01.
- Davenport, John (1994-06-01). "How and why do flying fish fly?". Reviews in Fish Biology and Fisheries. 4 (2): 184–214. doi:10.1007/BF00044128. ISSN 1573-5184.
- "Flying Fish | National Geographic". Animals. 2010-04-11. Retrieved 2019-09-01.
- Harper, Douglas. "exocet". Online Etymology Dictionary.
- Pliny's Natural History, vol. IX, 19)
- J. S. Nelson; T. C. Grande; M. V. H. Wilson (2016). Fishes of the World (5th ed.). Wiley. p. 366. ISBN 978-1-118-34233-6.
- Eschmeyer, W. N.; R. Fricke & R. van der Laan (eds.). "Exocoetidae genera". Catalog of Fishes. California Academy of Sciences. Retrieved 15 August 2019.
- Dasilao, J., & Yamaoka, K. (1998). Development Of The Vertebral Column And Caudal Complex In A Flyingfish, Parexocoetus Mento Mento (Teleostei: Exocoetidae). Ichthyological Research, 45(3), 303-308.
- Dasilao, J. C., & Sasaki, K. (1998). Phylogeny Of The Flyingfish Family Exocoetidae (Teleostei, Beloniformes). Ichthyological Research, 45(4), 347-353.
- Fish, F. E. (1990). "Wing design and scaling of flying fish with regard to flight performance" (PDF). Journal of Zoology. 221 (3): 391–403. doi:10.1111/j.1469-7998.1990.tb04009.x. Archived from the original (PDF) on 2013-10-20.
- Kutschera, U. (2005). "Predator-driven macroevolution in flyingfishes inferred from behavioural studies: historical controversies and a hypothesis" (PDF). Annals of the History and Philosophy of Biology. 10: 59–77. Archived from the original (PDF) on 2007-08-20.
- Fish, F. (1991). "On a fin and a prayer" (PDF). Scholars. 3 (1): 4–7. Archived from the original (PDF) on 2013-11-02.
- "Fast flying fish glides by ferry". BBC News. May 20, 2008. Retrieved May 20, 2008.
- Ross Piper (2007), Extraordinary Animals: An Encyclopedia of Curious and Unusual Animals, Greenwood Press.
- Flying Fish, Exocoetidae National Geographic. Retrieved 10 August 2014.
- Joseph Banks (1997). The Endeavour Journal of Sir Joseph Banks 1768–1771 (PDF). University of Sydney Library. Retrieved July 16, 2009.
- Moran. Churchill: Taken from the Diaries of Lord Moran. p. 819.
- "Barbados/Trinidad and Tobago". Permanent Court of Arbitration. April 11, 2006. Archived from the original on 2010-06-02.
- "Claims of Caribbean piracy as national symbol takes flight". The Sydney Morning Herald. December 18, 2004.
|Wikimedia Commons has media related to Exocoetidae.|
|Wikisource has the text of the 1911 Encyclopædia Britannica article Flying-fish.|