Fish Identifier
Tarpon (Megalops atlanticus)
2017, cuba, jardines aggressor, boca de piedra, tarpon (37521134712) by q phia, via Wikimedia Commons, licensed under CC BY 2.0
brackish

Tarpon

Megalops atlanticus

A giant, silver-scaled fish known as the 'Silver King,' famous for its acrobatic leaps and its ability to gulp air at the surface in low-oxygen coastal waters.

Habitat
Coastal waters, estuaries, mangroves
Size
1-2.5 m
Diet
Carnivore

Spotted a fish like this?

Identify any fish from a photo, free.

Overview

The Tarpon, or Atlantic Tarpon, is a large, primitive fish belonging to the family Megalopidae, an ancient lineage related to eels through its ribbon-like leptocephalus larval stage. It inhabits warm coastal waters, estuaries, and mangrove-lined shorelines of the western Atlantic, Gulf of Mexico, and Caribbean, with related species found in the Indo-Pacific. Renowned for its brilliant silver scales, explosive leaping fights, and unusual ability to breathe atmospheric air using a modified swim bladder, the Tarpon is one of the most iconic inshore and coastal game fish, and a symbol of tropical and subtropical estuarine sport fishing.

How to identify it

Tarpon have a large, laterally compressed, torpedo-shaped body covered in exceptionally large, bright silvery scales that give the species its 'Silver King' nickname and make it unmistakable among coastal fish, even at a distance or from below the surface.

  • Long, whip-like filament trailing from the back of the single dorsal fin
  • Large, upturned mouth with a bony, protruding lower jaw
  • Big, round eyes and a bluish-green to gray back
  • Deeply forked tail fin
  • Impressive size, ranging from about 1 to 2.5 m and often exceeding 45 kg

Habitat & range

Tarpon inhabit warm coastal and estuarine waters of the western Atlantic Ocean, including the Gulf of Mexico, Caribbean Sea, and southeastern United States, with juveniles often found in brackish backwaters, mangrove creeks, and low-oxygen marshes. Adults range more widely into open coastal waters, passes, and nearshore reefs, while remaining tied to warm temperatures and often returning to estuaries and river mouths. A specialized, highly vascularized swim bladder allows Tarpon to gulp air at the surface, letting them survive in poorly oxygenated waters that few other large fish can tolerate.

Behavior & ecology

Tarpon are powerful, opportunistic predators that feed on fish and crustaceans, often rolling at the surface to gulp air using their air-breathing swim bladder, an adaptation that lets them inhabit oxygen-poor estuarine waters. They are famous for spectacular aerial leaps and long, powerful runs when hooked or startled, a behavior tied to their strength and buoyant swim bladder. Tarpon migrate seasonally along coastlines and offshore to spawn in open water, where females release millions of tiny eggs that hatch into unusual ribbon-shaped leptocephalus larvae, similar to those of eels, before transforming into juvenile fish that move into estuarine nursery habitats.

Frequently asked questions

Why is the Tarpon called the 'Silver King'?

It is named for its exceptionally large, bright, mirror-like silver scales that cover its entire body.

How can Tarpon survive in low-oxygen water?

They have a specialized, highly vascularized swim bladder that lets them gulp air at the surface, functioning almost like a lung.

What do young Tarpon look like before becoming juveniles?

They pass through a transparent, ribbon-shaped leptocephalus larval stage similar to that of eels before transforming into recognizable juvenile fish.