How to Identify Giant Grouper

To identify Giant Grouper (Epinephelus lanceolatus), look at these key features.

Physical Characteristics

Body shape

torpedo

Coloration

Adults are typically mottled brown to grey with irregular darker spots or bands, often appearing blotchy. Juveniles are yellowish with broad, irregular dark bands and scattered small black spots. Coloration can change rapidly for camouflage.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Massive size, reaching up to 2.7 meters (8.9 ft) in length and 400 kg (880 lbs) in weight., Broad, slightly flattened head with a large, protractile mouth., Small eyes relative to head size., Rounded caudal fin., Short, stout dorsal spines., Absence of a notch between the spiny and soft parts of the dorsal fin.

Dorsal fin

11 dorsal spines, 14-16 soft rays; continuous, without a deep notch.

Tail fin

Rounded caudal fin.

Pectoral fin

Large and rounded, 18-19 rays.

Distinctive fins

Pelvic fins are relatively short, not reaching the anus.

Identification Tips

1. 1

   Size

   Its immense size is often the most distinguishing feature, being the largest reef-dwelling bony fish.

2. 2

   Coloration and Pattern

   Mottled brown/grey body with irregular darker blotches or spots. Juveniles are yellowish with broad dark bands.

3. 3

   Caudal Fin

   Always rounded, never emarginate or forked.

4. 4

   Dorsal Fin

   Continuous dorsal fin without a deep notch between the spiny and soft-rayed portions.

5. 5

   Mouth

   Very large, protractile mouth capable of engulfing substantial prey.

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