How to Identify Moses Perch

To identify Moses Perch (Lutjanus russellii), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Generally silvery-pink to reddish-brown dorsally, fading to silvery-white ventrally. Often exhibits 7-8 narrow, dark, horizontal stripes along the flanks, which may be faint or prominent depending on the individual and environment. A prominent black spot, often ovoid or rectangular, is typically present on the lateral line below the anterior part of the soft dorsal fin. Fins are often yellowish or dusky.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Prominent black spot on the lateral line below the soft dorsal fin., 7-8 faint to prominent horizontal stripes on the flanks., Relatively deep body for a snapper., Large mouth with canine teeth.

Dorsal fin

Single dorsal fin with 10 spines and 13-14 soft rays. The spinous and soft-rayed portions are continuous.

Tail fin

Truncate to slightly emarginate caudal fin.

Pectoral fin

Long pectoral fins, typically reaching to or beyond the anus.

Distinctive fins

Anal fin with 3 spines and 8 soft rays. Pelvic fins are thoracic.

Identification Tips

1. 1

   Lateral Spot

   Look for the distinctive, often rectangular or ovoid, black spot on the lateral line, positioned below the anterior soft rays of the dorsal fin. This is the most reliable distinguishing feature.

2. 2

   Body Stripes

   Observe the 7-8 narrow, dark horizontal stripes on the flanks. These can vary in intensity but are usually present, especially in live specimens.

3. 3

   Fin Coloration

   Note the yellowish or dusky coloration of the fins, particularly the pelvic and anal fins.

4. 4

   Juvenile Habitat

   If encountered in estuaries or mangroves, it is likely a juvenile L. russellii, though careful examination of the lateral spot is still crucial to differentiate from similar species.

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