How to Identify Yellowedge Grouper

To identify Yellowedge Grouper (Hyporthodus flavolimbatus), look at these key features.

Physical Characteristics

Body shape

torpedo

Coloration

Adults are typically brownish-gray to reddish-brown dorsally, fading to a lighter, often yellowish or whitish, ventral surface. The most distinguishing feature is the bright yellow to golden-orange margin on the dorsal, caudal, and anal fins, which is more prominent in juveniles and subadults. Juveniles often have a series of dark blotches or bars on their sides.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Bright yellow to golden-orange margins on the dorsal, caudal, and anal fins., A prominent notch in the interopercle (bone below the eye)., The dorsal fin has 11 spines and 13-15 soft rays., The anal fin has 3 spines and 9 soft rays., The caudal fin is truncate to slightly emarginate., The preopercle (gill cover bone) is finely serrated, with a distinct notch above the angle.

Dorsal fin

Single, long dorsal fin with 11 strong spines followed by 13-15 soft rays. The spinous and soft-rayed portions are continuous.

Tail fin

Truncate to slightly emarginate (forked), with a distinct yellow margin.

Pectoral fin

Relatively long and rounded, typically extending beyond the anus, with 17-19 rays.

Distinctive fins

All median fins (dorsal, caudal, anal) and often the pectoral fins exhibit a prominent yellow to golden-orange margin, especially noticeable on the caudal fin.

Identification Tips

1. 1

   Fin Margins

   Look for the bright yellow to golden-orange margins on the dorsal, caudal, and anal fins. This is the most reliable distinguishing feature, especially in adults.

2. 2

   Interopercle Notch

   Examine the bone below the eye (interopercle); a distinct notch is present, which helps differentiate it from some other grouper species.

3. 3

   Body Coloration

   Note the brownish-gray to reddish-brown body color, often lighter ventrally. Juveniles may have faint bars or blotches.

4. 4

   Caudal Fin Shape

   The tail fin is typically truncate (straight) to slightly emarginate (shallowly forked), not deeply forked or rounded.

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