How to Identify Silver Trevally

To identify Silver Trevally (Pseudocaranx georgianus), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Generally silvery-white on the flanks and belly, with a darker, often bluish-green or greyish-green dorsal surface. A distinct black spot is usually present on the upper operculum (gill cover) and sometimes at the base of the pectoral fin. Juveniles may have faint vertical bands.

Scale type

cycloid

Mouth position

terminal

Distinctive features

Streamlined, moderately compressed body., Large, prominent eyes., A distinct black spot on the upper operculum., Lateral line with a moderately long anterior arch and a straight posterior section, armed with scutes (bony plates) posteriorly., Small, cycloid scales covering the body.

Dorsal fin

Two dorsal fins; the first with 8 spines, the second with 1 spine and 22-25 soft rays. The anterior rays of the second dorsal fin are elongated.

Tail fin

Deeply forked caudal fin.

Pectoral fin

Long, falcate (sickle-shaped) pectoral fins, typically longer than the head.

Distinctive fins

Anal fin with 2 detached spines followed by 1 spine and 18-20 soft rays. Pelvic fins are relatively small.

Identification Tips

1. 1

   Opercular Spot

   Look for a prominent black spot on the upper part of the gill cover. This is a key distinguishing feature.

2. 2

   Pectoral Fin Length

   The pectoral fins are notably long and curved, often extending beyond the origin of the second dorsal fin.

3. 3

   Scutes on Lateral Line

   Feel or observe the scutes (bony plates) along the straight posterior section of the lateral line, which are characteristic of carangids.

4. 4

   Body Coloration

   The overall silvery body with a darker dorsal surface and the absence of strong vertical bars (except in some juveniles) helps in identification.

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