Alectis ciliaris


Threadfin trevally LIJ
Characteristic features:
Colour:

Mostly silver with a light green tinge on upper portion of body and head, silvery-white below. Juveniles with anterior soft rays of dorsal and anal fins extremely long and filamentous; 5 dark chevron-shaped bars on body; a black blotch at the base of third to 6th dorsal-fin rays and elongated filaments black at tips.

Size:

Up to 130 cm TL.

Distribution:

Circumglobal in tropical waters.

Habitat:

Coastal waters, from the surface to 100 m depth.

Biology:

Feeds primarily on sedentary or slow-swimming crustaceans and occasionally small fishes. Adults are demersal and are usually found in solitary in coastal waters, juveniles up to 25 cm are pelagic and drift in the currents. No information on maturity is available. Maximum age is unknown.

Indonesian fisheries:

Caught mainly by hook-and-line and beach seining.

Similar species:

Alectis indica
Indian threadfin

Alectis indica

Alectis indica differs in having profile of nape and head somewhat angular (vs. broadly rounded); distance between eye and rear maxilla 0.8–1 times in upper jaw length (vs. 1.7–3 times in upper jaw length) and gill rakers (excluding rudiments) on upper limb of first gill arch 21–26 (vs. 12–17).

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