How to Identify Black Grouper

To identify Black Grouper (Mycteroperca bonaci), look at these key features.

Physical Characteristics

Body shape

torpedo

Coloration

Generally dark gray to olive-brown dorsally, fading to a lighter underside. Characterized by irregular, rectangular, or hexagonal dark blotches and brassy spots on the head and body, which can be highly variable and change rapidly depending on mood and environment. The pectoral fins are dusky, and the soft dorsal, anal, and caudal fins have dark margins.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Elongated, robust body, Pointed snout, Slightly convex interorbital area, Lower jaw projects beyond the upper jaw, Preopercle is serrated, with a distinct notch above the angle, Pectoral fins are relatively short, not reaching the anus, Caudal fin is square or slightly emarginate in adults, rounded in juveniles

Dorsal fin

11 spines, 15-17 soft rays; deeply notched between spiny and soft portions.

Tail fin

Square to slightly emarginate in adults, rounded in juveniles.

Pectoral fin

17-18 rays; relatively short.

Distinctive fins

Soft dorsal, anal, and caudal fins have dark margins.

Identification Tips

1. 1

   Coloration and Pattern

   Look for the distinctive irregular, rectangular, or hexagonal dark blotches and brassy spots on a dark gray to olive-brown background. These patterns are key to distinguishing it from other groupers.

2. 2

   Jaw Structure

   The lower jaw prominently projects beyond the upper jaw, a characteristic feature among Mycteroperca species.

3. 3

   Preopercle

   Examine the preopercle (gill cover bone); it is serrated with a distinct, often deep, notch above the angle.

4. 4

   Caudal Fin Shape

   In adults, the caudal fin is typically square or slightly emarginate (concave), not rounded like some other groupers.

5. 5

   Fin Margins

   The soft dorsal, anal, and caudal fins usually have distinct dark margins.

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