Mackerel tuna

Marine fish with regularly ossified skeleton. Elongated and fusiform body; no fatty eyelid; jaw teeth slender, conical; top of tongue with 2 cartilaginous crests; 2 dorsal fins barely separated; front of 1st dorsal is high; 9 dorsal finlets and 7 anal finlets; bone between base of pelvics short, forked; two small keels separated by one large one on tail base; corselet of large, thickened scales on front body, body scaleless behind corselet. Colour: Blue above, silvery below; a cluster of black spots on belly above pelvic fin; 12 oblique dark lines on upper back behind corselet. It measures up to 1 m and weighs up to 14 kg.