Atlantic tarpon

The Atlantic tarpon (Megalops atlanticus) is a ray-finned fish that inhabits coastal waters, estuaries, lagoons, and rivers. It is also known as the silver king. It is found in the Atlantic Ocean, typically in tropical and subtropical regions, though it has been reported as far north as Nova Scotia and the Atlantic coast of southern France, and as far south as Argentina. As with all Elopiformes, it spawns at sea. Its diet includes small fish and crustaceans.[5] It has been recorded at up to 2.5 m (8 ft 2 in) in length and weighing up to 161 kg (355 lb).

Atlantic tarpon
Temporal range: Miocene-recent, [1]
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Elopiformes
Family: Megalopidae
Genus: Megalops
Species:
M. atlanticus
Binomial name
Megalops atlanticus
Synonyms[3][4]
  • Tarpon atlanticus (Valenciennes 1847)
  • Clupea gigantea Shaw 1804
  • Megalops giganteus (Shaw 1804)
  • Megalops elongatus Girard 1859
  • Amia subargentea Browne 1789

A tarpon is capable of filling its swim bladder with air, like a primitive lung. This gives it a predatory advantage when oxygen levels in the water are low. In appearance, it is greenish or bluish on top and silver on the sides. The large mouth is turned upwards and the lower jaw contains an elongated, bony plate. The last ray of the dorsal fin is much longer than the others, reaching nearly to the tail. The tarpon is the official state saltwater fish of Alabama.[6] It is mostly inedible, but valued as a game fish.

The tarpon has a reputation for great aerobatics and has been the subject of media attention, including the TV miniseries Chasing Silver, released in 2004.

Game fishing
Atlantic tarpon

Tarpons are considered one of the great saltwater game fishes, not only because of their size and their accessible haunts, but also because of their fighting spirit when hooked; they are very strong, making spectacular leaps into the air. The flesh is undesirable and bony. In Florida and Alabama, a special permit is required to kill and keep a tarpon, so most tarpon fishing there is catch and release.


Despite its name, the Atlantic tarpon is not limited to one body of water or exclusive to the East Coast. In their northern migration, they range through the Florida Keys and gradually make their way up the west coast of Florida and on to the Texas coast. The International Sábalo (tarpon) Fishing Tournament is held every May in Tecolutla on Mexico's Costa Esmeralda.

Geographical distribution and migration
Illustration of an Atlantic Tarpon

Since tarpons are not commercially valuable as a food fish, very little has been documented concerning their geographical distribution and migrations. They inhabit both sides of the Atlantic Ocean. Their range in the eastern Atlantic has been reliably established from Senegal to the Congo. Tarpons inhabiting the western Atlantic are principally found to populate warmer coastal waters primarily in the Gulf of Mexico, Florida, and the West Indies. Nonetheless, they are regularly caught by anglers at Cape Hatteras and as far as Nova Scotia, Bermuda, and south to Argentina. Scientific studies[7] indicate schools have routinely migrated through the Panama Canal from the Atlantic to the Pacific and back for over 70 years. They have not been shown to breed in the Pacific Ocean, but anecdotal evidence by tarpon fishing guides and anglers indicates it is possible, as over the last 60 years, many small juveniles and some mature giants have been caught and documented, principally on the Pacific side of Panama at the Bayano River, in the Gulf of San Miguel and its tributaries, Coiba Island in the Gulf of Chiriquí, and at Piñas Bay in the Gulf of Panama. Since tarpons tolerate a wide range of salinity and are opportunistic feeders, their migrations are only limited only by water temperatures. They prefer water temperatures of 72 to 82°F; below 60°F they become inactive, and temperatures under 40°F can be lethal. A large non-migrant tarpon community is found in the Rio San Juan and Lake Nicaragua.


References
  1. "†Megalops atlanticus Valenciennes 1847 (ray-finned fish)". PBDB.
  2. Adams, A.; Guindon, K.; Horodysky, A.; MacDonald, T.; McBride, R.; Shenker, J. & Ward, R. (2012). "Megalops atlanticus". IUCN Red List of Threatened Species. 2012: e.T191823A2006676. doi:10.2305/IUCN.UK.2012.RLTS.T191823A2006676.en.
  3. "Megalopidae" (PDF). Deeplyfish- fishes of the world. Retrieved 18 May 2017.
  4. Froese, R.; Pauly, D. (2017). "Megalopidae". FishBase version (02/2017). Retrieved 18 May 2017.
  5. Froese, Rainer and Pauly, Daniel, eds. (2005). "Megalops atlanticus" in FishBase. 05 2005 version.
  6. "Official Alabama Saltwater Fish". Alabama Emblems, Symbols and Honors. Alabama Department of Archives & History. 2006-04-27. Retrieved 2007-03-18.
  7. The Panama Canal as a Passageway for Fishes, with Lists and Remarks on the Fishes and Invertebrates Observed, Samuel F. Hildebrand (1939)
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