Body shape :  Elongate and laterally compressed

Average size :  38 cm (15 in), 1 kg (2 lb)

Coloration :  Green-brown to black back (varies with habitat); silvery flanks.

External characteristics :  Small mouth with snout extending beyond lower jaw; large scales; adipose fin far beyond dorsal fin; dorsal and pelvic fins at mid-body length; pronounced forked caudal fin.