How to Identify Jack Crevalle

To identify Jack Crevalle (Caranx hippos), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Dorsal side is typically bluish-green to greenish-gold, fading to silvery-white or yellowish on the belly. A prominent black spot is present on the operculum (gill cover) and another smaller, often less distinct, black spot at the base of the pectoral fin. The caudal fin is often yellowish to dusky.

Scale type

cycloid

Mouth position

terminal

Distinctive features

Deep, compressed body with a steep, blunt head profile., Large, prominent black spot on the operculum., Strongly keeled lateral line with 23-35 scutes (bony plates) on the posterior section., Large, dark spot at the base of the pectoral fin., Strongly forked caudal fin.

Dorsal fin

Two dorsal fins: the first with 8 spines (often embedded in larger adults), and the second with 1 spine and 19-22 soft rays. The anterior rays of the second dorsal fin are elongated.

Tail fin

Deeply forked, with prominent lobes.

Pectoral fin

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

Distinctive fins

Anal fin with 2 detached spines followed by 1 spine and 16-18 soft rays, similar in shape to the second dorsal fin.

Identification Tips

1. 1

   Opercular Spot

   Look for the large, distinct black spot on the gill cover. This is a primary identifier.

2. 2

   Pectoral Fin Spot

   A smaller, often less prominent, dark spot at the base of the pectoral fin is also characteristic.

3. 3

   Lateral Line Scutes

   Feel or observe the prominent, bony scutes along the posterior part of the lateral line. There are typically 23-35 of these.

4. 4

   Head Profile

   Note the steep, blunt head profile, which distinguishes it from some other Caranx species.

5. 5

   Fin Coloration

   The yellowish to dusky caudal fin can be a helpful clue, especially in contrast to the body color.

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