How to Identify Yellow Jack

To identify Yellow Jack (Carangoides bartholomaei), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Adults are typically silvery-white to yellowish-silver, often with a golden or brassy sheen, particularly on the lower flanks and belly. Juveniles are distinctly yellow, often with 5-7 vertical dark bands on their sides, which fade with age. The fins are usually yellowish, especially the caudal and anal fins. Some individuals may display a dusky blotch on the operculum.

Scale type

cycloid

Mouth position

terminal

Distinctive features

Deeply compressed body, Prominent yellow coloration in juveniles and sometimes adults, Absence of scutes on the lateral line anteriorly, with a short posterior section of scutes (22-28 scutes), A small, dark spot often present on the upper operculum, Relatively small eye compared to body size in adults

Dorsal fin

Two dorsal fins; the first with 8 spines, the second with 1 spine and 25-28 soft rays. The anterior rays of the second dorsal fin are elongated, forming a small lobe.

Tail fin

Deeply forked caudal fin, with pointed lobes.

Pectoral fin

Long, falcate (sickle-shaped) pectoral fins, extending beyond the origin of the anal fin.

Distinctive fins

Anal fin with 2 detached spines followed by 1 spine and 21-24 soft rays. Pelvic fins are relatively short.

Identification Tips

1. 1

   Coloration

   Look for the overall silvery-yellow body, especially the distinct yellow hue in juveniles. Adults may have a more subdued yellow or brassy tint.

2. 2

   Body Shape

   Note the deep, compressed body profile, characteristic of many Carangidae species.

3. 3

   Lateral Line

   Examine the lateral line; it is arched anteriorly and has a relatively short posterior section of scutes (22-28). This is a key distinguishing feature from other jacks.

4. 4

   Pectoral Fins

   Observe the long, falcate pectoral fins, which are proportionally longer than in some other Carangoides species.

5. 5

   Opercular Spot

   A small, dark spot on the upper operculum is often present, though it can be faint in some individuals.

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