Body oblong and compressed. Two dorsal fins, the first with 7 spines, the 3rd and 4th the largest. The soft dorsal rays longer than dorsal spines. Anal fin origin at the vertical of 2nd dorsal fin origin. Caudal fin round. Pelvic fin origin under pectoral fin origin. Mouth slightly oblique reaching back beyond eye. Large eye, its diameter 3.3-4.0 times in head length. Preopercle edge smooth. Large scales.
Size : 3-12 cm (max 15 cm).
Color : body grey to off-white, slightly darker on the back. Dark grey to brown spots on the body forming longitudinal irregular lines. Large black spot on the posterior edge of first dorsal fin. Posterior edge of caudal fin and lower of anal fin dark grey to black. Pectoral and pelvic fins transparent to white.
Apogon spp. – No longitudinal irregular lines on the body, no large black spot on the posterior edge of first dorsal fin.
Serranidae, Teraponidae, Haemulidae, Sparidae and Labridae – A single dorsal fin.
BIOLOGY / ECOLOGY
Nocturnal species. Feeds on zooplankton during the night. The males presumably incubate the eggs in the mouth.
habitat : during the day hide in rocky habitat, while at night prey in open water close to the substrate to depth of 90 m.