How to Identify Potato Grouper

To identify Potato Grouper (Epinephelus tukula), look at these key features.

Physical Characteristics

Body shape

rounded

Coloration

Adults are typically pale grey to brownish-grey, covered with numerous large, irregularly shaped, dark brown to black spots that resemble potatoes. These spots are often outlined with a paler margin. The fins are similarly spotted. Juveniles may have fewer, larger spots.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Large, irregular, potato-like dark spots over the entire body and fins., Robust, heavy-bodied appearance., Large mouth with several rows of sharp, conical teeth., Slightly convex or truncate caudal fin in adults.

Dorsal fin

Single dorsal fin with 11 spines and 14-16 soft rays. The spinous portion is lower than the soft-rayed portion.

Tail fin

Caudal fin is slightly convex to truncate in adults, rounded in juveniles.

Pectoral fin

Large and rounded, typically unspotted or with very faint spots.

Distinctive fins

Pelvic fins are relatively short, not reaching the anus.

Identification Tips

1. 1

   Spot Pattern

   Look for the characteristic large, irregular, dark brown to black spots resembling potatoes on a lighter background. These spots are present on the body and fins.

2. 2

   Body Shape

   Note the very robust, heavy-bodied appearance, typical of large groupers.

3. 3

   Caudal Fin

   In adults, the caudal fin is typically slightly convex or truncate, not deeply forked or rounded.

4. 4

   Size

   This is one of the largest grouper species, often exceeding 1.5 meters in length and 100 kg in weight.

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