The blue trevally (Carangoides ferdau), also known as the banded trevally, barred trevally, Ferdau's trevally or Forskaal's jackfish, is a common, widespread species of pelagic marine fish classified in the jack family, Carangidae. The blue trevally is distributed throughout the tropical and subtropical waters of the Indo-Pacific and central Pacific regions, ranging from South Africa in the west to Hawaii in the east. It is a moderately large fish, growing to a recorded maximum length of 70 cm, with the number of rays in the second dorsal fin and the colouring serving as diagnostic features of the species. The species inhabits waters to depths of 60 m, generally inhabiting reefs, beaches, lagoons, and areas with sandy substrates. It is a predatory fish, taking other fish, prawns, crabs, and molluscs, and very little is known of the species' reproductive biology. The blue trevally is of varying importance to fisheries throughout its range, with some regions having high catches of the fish. It is considered to be a gamefish, and is sought after for its excellent eating qualities.
Taxonomy and naming
The blue trevally is classified within the genus Carangoides, a group of fish commonly known as jacks and trevallies. Carangoides falls into the jack and horse mackerel family Carangidae, the Carangidae are part of the order Carangiformes.
The species was first described by the Swedish naturalist Peter Forsskål in 1775 based on a specimen taken from the Red Sea. He named the species Scomber ferdau, thus relating it to the mackerels before the family Carangidae was bought into existence with the creation of Lacépède's genus Caranx. With the advent of carangid taxonomy, the species was transferred first to Caranx and finally to Carangoides, where it has remained to this day. Gilbert Percy Whitley attempted to separate the species into its own genus; Ferdauia, although this classification is not accepted. The species was independently described and named a number of times after its initial naming, with this and confusion with Carangoides orthogrammus in the Indo-Pacific giving rise to a complex history of synonymies. These later names were often transferred between genera before being finally sunk into the name Carangoides ferdau and as such are considered to be invalid junior synonyms. The specific epithet ferdau refers to a person named Ferdau, probably the collector of the holotype specimen.
Description
The blue trevally is a moderately large fish, growing to a recorded maximum length of 70 cm and a weight of 8 kg. The species is similar in general morphology to a number of other trevallies in the genus Carangoides, having a compressed, oblong body, with the dorsal profile more convex than the ventral profile. Unlike most of the Carangoides, however, the blue trevally's snout is bluntly rounded, resembling the snouts of the pompanos of the genus Trachinotus and the lips of adults are notably fleshy. Two separate dorsal fins are found, the first having eight spines, while the second consists of one spine and 26 to 34 soft rays; more than any other species in Carangoides. In young adults, the lobe of the second dorsal fin is often falcate, but usually shorter than the head length. The anal fin has two anteriorly detached spines followed by a single spine attached to 21 to 26 soft rays, while the pelvic fin has one spine attached to 20 or 21 soft rays. The lateral line has a gentle anterior arch, with the junction of the curved and straight sections vertically below the 15th to 20th soft rays of the second dorsal fin. The curved section of the lateral line contains 82 to 90 scales, while the straight section has 12 to 17 scales and 26 to 31 scutes. The breast is naked ventrally to origin of the pelvic fins and the base of the pectoral fins, but is interrupted laterally by a moderate band of scales. The upper jaw is highly protractile, containing narrow bands of villiform teeth, which become obsolescent with age, as is the case in the lower jaw. It has a total of 24 to 29 gill rakers and 24 vertebrae.
The body is a blue-green to yellow-green above, becoming silvery below, with adults having five or six dusky vertical bands which usually persist after death. Numerous, inconspicuous golden spots often are present on the sides, mostly above the level of the pectoral fins. The soft dorsal and anal fins are pale yellowish-green, and the anterior lobes of both often have white to blue tips. The caudal fin is yellow green, having a dark trailing edge and tips, while the pelvic fins are whitish to hyaline.