How to Identify Tiger Grouper

To identify Tiger Grouper (Mycteroperca tigris), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

The body color is typically a mottled brown to reddish-brown or grey, overlaid with 9-11 irregular, dark, wavy, vertical bars or stripes that extend onto the dorsal and anal fins. The belly is often lighter. Coloration can vary significantly based on mood and habitat, allowing for effective camouflage.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

9-11 irregular, dark, wavy vertical bars on the body., Deeply notched dorsal fin membrane between the spines., Concave caudal fin in adults., Elongated body typical of Mycteroperca species., Large mouth with several rows of small, sharp teeth.

Dorsal fin

Single dorsal fin with 11 spines and 15-17 soft rays. The membrane between the dorsal spines is deeply notched.

Tail fin

Caudal fin is distinctly concave (lunate) in adults, becoming more emarginate in juveniles.

Pectoral fin

Pectoral fins are relatively short and rounded, with 16-18 rays.

Distinctive fins

Anal fin has 3 spines and 11-12 soft rays. Pelvic fins are thoracic, located below the pectoral fins.

Identification Tips

1. 1

   Body Pattern

   Look for the characteristic 9-11 dark, wavy, vertical bars on a lighter background. This is the most reliable visual identifier.

2. 2

   Dorsal Fin

   Observe the deeply notched membrane between the spines of the dorsal fin, a key feature distinguishing it from some other grouper species.

3. 3

   Caudal Fin Shape

   Adults have a distinctly concave (lunate) tail fin, which is a good indicator.

4. 4

   Body Shape

   Its more elongated body profile, compared to the robust, stocky build of some other groupers (e.g., Epinephelus species), is also helpful.

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