Description
The whitefin trevally is a relatively small fish, reaching a maximum known length of 37.5 cm. The species has a body shape similar to a number of other jacks, having a compressed almost rhomboidal body, with the dorsal and ventral profiles approximately equally convex. The dorsal profiles of the snout and nape in the species are almost straight. There are two separate dorsal fins, the first having 7 spines, while the second consists of 1 spine and 23 to 25 soft rays. The first dorsal fin is moderately high, with the longest spine approximately has high as the soft dorsal-fin lobe is long, and is quite distinctive of the species. The anal fin consists of 2 anteriorly detached spines followed by 1 spine and 21 to 24 soft rays, with the pelvic fin having one spine and 18 or 19 soft rays. The lateral line has a moderately strong anterior arch with the junction of the curved and straight sections occurring vertically below the twelfth to fifteenth soft rays of the second dorsal fin. The curved segment of the lateral line is longer than the straight section, which contains 0 to 6 scales followed by 22 to 32 scutes. The breast is entirely scaled, or has a very small naked area anteroventrally. Both jaws contain narrow bands of small teeth, with the outer teeth slightly larger. There are 27 to 32 gill rakers in total and 24 vertebrae.
The whitefin trevally is silver, with a blue to green dorsal surface, becoming silvery white below. The soft dorsal and anal fins are dusky yellow basally, with the anterior rays of both having dark grey-brown median and white distal bands. The caudal fin is dusky yellow, while the pectoral and pelvic fins are white. Juveniles have between 5 and 7 dark bands vertically on their sides.
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