How to Identify Onespot Snapper

To identify Onespot Snapper (Lutjanus monostigma), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Generally yellowish-brown to reddish-brown dorsally, fading to a lighter, often silvery, ventral side. Fins are typically yellowish. The most distinguishing feature is a prominent black spot, usually smaller than the eye, located on the lateral line below the anterior part of the soft dorsal fin. This spot can be indistinct or absent in very large or very small individuals.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Prominent black spot on the upper flank, below the soft dorsal fin., Relatively deep body with a pointed snout., Large mouth with canine teeth., Preopercular notch and knob are well-developed.

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 the anus, with 16-17 rays.

Distinctive fins

Anal fin with 3 spines and 8-9 soft rays. Pelvic fins are relatively short.

Identification Tips

1. 1

   Black Spot

   Look for a distinct, dark spot on the upper flank, just below the anterior part of the soft dorsal fin. This is the most reliable identifier, though it can fade in very large specimens.

2. 2

   Body Coloration

   Observe the overall yellowish-brown to reddish-brown body color, often with a lighter belly. Fins are typically yellowish.

3. 3

   Snout and Mouth

   Note the pointed snout and relatively large mouth with visible canine teeth, characteristic of a predatory snapper.

4. 4

   Fin Count

   Count the dorsal fin spines (10) and soft rays (13-14), and anal fin spines (3) and soft rays (8-9) for confirmation, especially when the spot is indistinct.

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