How to Identify Chocolate Rockcod

To identify Chocolate Rockcod (Epinephelus chlorostigma), look at these key features.

Physical Characteristics

Body shape

torpedo

Coloration

The body is typically pale grey to brownish-grey, covered with numerous closely set, dark brown to reddish-brown spots. These spots are generally round or oval and often coalesce on the head and fins. A distinctive feature is a series of 5-6 irregular, dark blotches or bars along the dorsal side, which may be more prominent in some individuals or under certain conditions. The ventral side is usually lighter.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Numerous small, dark brown to reddish-brown spots covering the head, body, and fins., 5-6 irregular, dark blotches or bars along the dorsal profile., Posterior nostril is significantly larger than the anterior nostril, often slit-like., Preopercle finely serrated, with a distinct notch above the angle., Maxilla extends well past the posterior margin of the eye.

Dorsal fin

Single dorsal fin with XI spines and 16-18 soft rays. The spinous portion is continuous with the soft-rayed portion, with spines gradually increasing in length posteriorly.

Tail fin

Caudal fin is truncate to slightly emarginate, with rounded corners.

Pectoral fin

Pectoral fins are relatively short and rounded, with 17-19 rays.

Distinctive fins

Pelvic fins are inserted slightly anterior to the pectoral fin base. Anal fin has III spines and 8 soft rays.

Identification Tips

1. 1

   Spot Pattern

   Look for the dense covering of small, dark brown to reddish-brown spots over a lighter background. These spots are generally uniform in size across the body.

2. 2

   Nostril Size

   Observe the posterior nostril, which is notably larger and often slit-like compared to the smaller, round anterior nostril. This is a key diagnostic feature.

3. 3

   Dorsal Blotch Pattern

   Note the presence of 5-6 irregular, dark blotches or bars along the dorsal profile, which can be more or less pronounced depending on the individual and its environment.

4. 4

   Caudal Fin Shape

   The caudal fin is typically truncate (straight-edged) to slightly emarginate, distinguishing it from some other grouper species with rounded or deeply forked tails.

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