Appearance
Nemadactylus macropterus has 17–18 spines and 25–28 soft rays in its dorsal fin and 3 spines and 14–15 soft rays in its anal fin. It attains a maximum total length of 70 cm (28 in), although 35 cm (14 in) is more typical, and a maximum published weight of 2.9 kg (6.4 lb). This is a large species with an overall silvery colour with a wide black band or crescentic marking which runs from the nape to the base of the pectoral fin. The seventh pectoral fin ray is elongated. The fins are light to dark-greyish without any clear markings. The juveniles are also silvery but have dark bands or blotches on their upper bodies.

