Large median keel with 2 smaller keels on either side of caudal peduncle
18–24 gill rakers on first gill arch
2 lateral lines joining above pectoral fin
11–13 dorsal-fin spines
Rectangular patch of sharp teeth on tongue
Body covered in moderately small scales, no corselet
Blue–green above and silvery white below.
Up to 65 cm TL, and up to 3.5 kg in weight.1
Found in tropical waters of the Indo-West Pacific.
Pelagic, found in open waters and also associated with reefs, inhabiting both coral reefs, outer reef walls. Found at depths below 15 m.
Feeds on fishes such as clupeids, Sphyraena and Balistes, and also crustaceans. Forms large schools. In waters off Fiji, length at first maturity is estimated at 40–43 cm FL.2 The spawning season extends from October to March.3
Caught mainly by pole-and-line fishing and by trolling.
Gymnosarda unicolor differs in having a single, undulating lateral line (vs. 2 lateral lines); 2 patches of teeth on the tongue (vs. single rectangular patch); interpelvic process large and single (vs. small and single) and a body mostly scaleless behind a corselet of enlarged scales (vs. covered in moderately small scales).
Thunnus spp. differ in having lateral line single and undulating (vs. 2 lateral lines) and body covered in small scales behind a corselet of enlarged thickened scales (vs. a body covered in moderately small scales).