How to Identify Atlantic Tarpon

To identify Atlantic Tarpon (Megalops atlanticus), look at these key features.

Physical Characteristics

Body shape

torpedo

Coloration

Silvery flanks and belly, with a dark blue to greenish-black dorsal surface. The large scales often have a reflective, iridescent quality, giving them the 'Silver King' moniker.

Scale type

cycloid

Mouth position

superior

Distinctive features

Large, prominent scales (cycloid type), Upward-pointing mouth with a protruding lower jaw, Last ray of the dorsal fin is greatly elongated into a filament, Large eyes, Modified swim bladder allowing for air breathing

Dorsal fin

Single dorsal fin, located mid-body, with 10-12 soft rays. The last ray is notably elongated, extending almost to the caudal fin.

Tail fin

Large, deeply forked caudal fin, powerful and symmetrical.

Pectoral fin

Relatively small, low-set pectoral fins.

Distinctive fins

Pelvic fins are abdominal, located well behind the pectoral fins. Anal fin is similar in shape to the dorsal fin but slightly smaller, with 20-25 soft rays.

Identification Tips

1. 1

   Dorsal Fin Filament

   The most distinctive feature is the elongated last ray of the dorsal fin, which extends far back, sometimes reaching the caudal fin base.

2. 2

   Mouth and Jaw

   Possesses a large, upward-pointing mouth with a prominent, protruding lower jaw.

3. 3

   Scales

   Very large, silvery, and reflective scales that are easily shed when handled.

4. 4

   Body Shape

   Large, robust, and elongated body, typically reaching lengths of 1.5-2.5 meters (5-8 feet) and weights over 100 kg (220 lbs), with the largest recorded at 2.5 meters and 161 kg (355 lbs).

5. 5

   Air Gulping

   Often observed 'rolling' at the surface, gulping air, especially in low-oxygen environments.

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