Black jack's description
The black jack (Caranx lugubris) is a species of large ocean fish in the jack family Carangidae.
Distinctive Characters: First dorsal fin with 8 spines, second dorsal fin with 1 spine and 20-22 rays. Anal fin with 2 detached spines, followed by 1 spine and 16-19 rays. Lobe of dorsal fin relatively long. Breast completely scaled. Profile of head relatively steep and regular.
Colour: Body and fins mostly uniform grey to black. A small dark spot at upper end of opercle, and scutes often black.