The species is easily distinguishable by their electric blue fins, which in real life are more vibrant than in the photographs.
Short description - Dorsal spines (total): 9; Dorsal soft rays (total): 21-24; Anal spines: 3; Anal soft rays: 17 - 21; Vertebrae: 24.
This species is distinguished by the following characters: gill rakers (including rudiments) 5-9 + 17-21 = 25-29 (usually 26-27); breast completely scaly; straight part of lateral line with 0-10 anterior scales followed by 27-42 strong scutes; adipose eyelid weakly developed, small anteriorly, posterior adipose eyelid extends onto eye to rear border of pupil in large adults; upper jaw with outer row of strong canines widely spaced in adults, and an inner band of small villiform teeth, widest at symphysis; lower limb of first gill arch jaw with a single row of strong conical teeth widely spaced in adults. Colour of adults with head and dorsal half of body brassy, suffused with blue, and covered with small blue black spots (forming at about 16 to 22 cm fork length and increasing in number with size); second dorsal, anal, and caudal fins electric blue; juveniles and young adults, head and body silvery grey and fins pale to dark dusky, except pectoral fins yellow.
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A coastal and oceanic species, associated with reefs. Bluefin jack is the most common jack on Maldivian reefs. Juveniles occur seasonally in shallow sandy inshore waters. Pelagic. Solitary or occasionally in schools. This species is most active during early morning and late afternoon, but it also hunts at night. A colourful trevally not shy of divers.
Feeds mainly on other fishes, also crustaceans.
This species have been used in Maldivian cuisines like "Garudhiya" "riha". It is served fried, dried. Caught primarily on hook-and-line also in past with traps and gill nets (gillnetting prohibited by maldivian law). This species is an excellent sports fish.
Although this species is a highly sought after game fish and food fish, there have not been any observed or suspected declines in the population of the species due to exploitation events. There are no other known major threats to this species.