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The Atlantic tarpon (Megalops atlanticus) is a ray-finned fish which 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.  They have been recorded at up to 2.5 m (8 ft 2 in) in length and weighing up to 161 kg (355 lb).
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, tarpons are 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.  It is mostly inedible but valued as a game fish.
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.
Although a variety of methods are used to fish for tarpons (bait, lure, and fly on spinning, conventional, or fly rod), the method that has garnered the most acclaim is flats-fishing with a fly rod. It is a sport akin to hunting, combining the best elements of hunting with fishing. A normal tarpon fly rod outfit uses 10–12 weight rods and reels, spooled with appropriate line and using a class leader tippet of 12–20 lb (5.4–9.1 kg); truly light tackle fishing where the fish may weigh 10 times or more than the breaking strength of the leader. Typically, an angler stations himself on the bow of a shallow-water boat known as a 'flats skiff', and with the aid of a guide, searches for incoming tarpon on the flats (inshore shallow areas of the ocean, typically no more than 3–4 ft (0.91–1.22 m) deep). When a school of tarpons are sighted, the guide positions the boat to intercept the fish. The angler usually has no more than six to 10 seconds to false cast out enough flyline and make an accurate cast to these fast-moving fish. Accuracy and speed are paramount, but the task is compounded by the inevitable excitement and nervousness of seeing a school of fish that may top 180 pounds (82 kg) bearing down on the angler. Once the cast is made, the fly is retrieved and hopefully a tarpon inhales the fly. The hookset is difficult due to the hard mouth of the fish, which has been likened to the hardness of concrete, so many tarpons throw the hook on the first few jumps; many times an angler is asked, "how many tarpons did you jump?" rather than how many they caught. If the hook stays secure, then the fight is on. Tarpons have tremendous endurance and are one of the most exciting gamefish to fight—frequent spectacular jumps, long runs, and stubborn bulldogging are all part of the game. Although an experienced and skillful tarpon angler can usually land a tarpon in less than an hour, the average angler usually takes longer, from one to more than three hours.
Another popular method is using lures or bait on heavy spinning or conventional gear. Many anglers prefer this as a more surefire method to catch tarpons. Usually, the reels are filled with line from 30- to 80-lb test although 50-lb (23-kg) test line seems to be the most popular. Although a great deal of fun, the outcome is less often in doubt, unlike fly fishing with light (20-lb test) line, and getting a tarpon to take a crab, mullet or pinfish is easier than an artificial fly.
Despite its namesake, the Atlantic tarpon is not limited to one body of water or exclusive to the East Coast. In their northern migration, tarpons range through the Florida Keys and gradually make their way up the west coast of Florida and on to the Texas coast. Of all the places where tarpons are found and fished, the one location most noted for easy access to large numbers of tarpons concentrated in a central location is Boca Grande Pass, on Florida's west coast. The attraction for the tarpons is the plentiful crabs and baitfish washed through the pass on an outgoing tide. The tarpon only need to position themselves along the bottom and gorge themselves as they attempt to avoid anglers. Numerous tournaments throughout the season, running from May through early August, attracts anglers from throughout the world.
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, tarpon are regularly caught by anglers at Cape Hatteras and as far as Nova Scotia, Bermuda, and south to Argentina. Scientific studies  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 wide ranges in salinity throughout their lives and will eat almost anything dead or alive, their migrations seemingly are only limited by water temperatures. Tarpons prefer water temperatures of 72 to 82 °F; below 60 °F they become inactive, and temperatures under 40 °F can be lethal. There is a large non-migrant tarpon community on the Rio San Juan, and lake Nicaragua they stay year round, making this river famous for it tarpon sport fishing. Tarpons can swim up rivers, as demonstrated in River monsters, when Jeremy wade caught an adult tarpon in an estuary.
- Adams, A.; Guindon, K.; Horodysky, A.; MacDonald, T.; McBride, R.; Shenker, J. & Ward, R. (2012). "Megalops atlanticus". The IUCN Red List of Threatened Species. IUCN. 2012: e.T191823A2006676. doi: 10.2305/IUCN.UK.2012.RLTS.T191823A2006676.en. Retrieved 13 January 2018.
- "Megalopidae" (PDF). Deeplyfish- fishes of the world. Retrieved 18 May 2017.
- Froese, R.; Pauly, D. (2017). "Megalopidae". FishBase version (02/2017). Retrieved 18 May 2017.
- Froese, Rainer and Pauly, Daniel, eds. (2005). "Megalops atlanticus" in FishBase. 05 2005 version.
- "Official Alabama Saltwater Fish". Alabama Emblems, Symbols and Honors. Alabama Department of Archives & History. 2006-04-27. Retrieved 2007-03-18.
- The Panama Canal as a Passageway for Fishes, with Lists and Remarks on the Fishes and Invertebrates Observed, Samuel F. Hildebrand (1939)