Apolemichthys trimaculatus is a small sized fish which grows up to 26 cm. Its body has a stock appearance, oval shape, strongly compressed laterally with a strong preopercle spine. The body coloration is bright yellow with three dark spots: one on the forehead, and one on each side close to the opercles at the eye level. There is a greyish blotch between the eyes. The lips are blue and the preopercle spine is light bluish grey. All the fins are yellow excepts the anal fin which is whitish with a large black margin. Juveniles have a false eye-spot at the base of the soft dorsal fin and a thin black line over the head, running through the eye. Dorsal fin with 14 spines and 16-18 rays. Anal fin with 3 spines and 17-19 rays. Pectoral fin with 17 rays. Body depth 1.6-1.8 in standard length.
Threespot angelfish's Behavior & Ecology
Threespot angelfish has a diurnal activity. It is protogynous hermaphrodite, which means the female can evolved to male during its life, and lives in harem composed of two to seven females for a male and it's a territorial fish. This species inhabits lagoon, coral reef, along steep slopes from surface until 80 m depth. Juveniles occur below 25 m.
The threespot angelfish is fairly common in Maldivian reefs and is widely distributed throughout the tropical waters of the Indian Ocean and western Pacific Ocean.
Threespot angelfish's Feeding
Feeds mainly on sponges and tunicates.
Threespot angelfish's Relationship with Humans
It is a popular aquarium fish.
Threespot angelfish habitat
Inhabits outer coral reef slopes and drop-offs at depths of 10 to 80 m, where it occurs as solitary animals in pairs, or in small loose groups (Pyle 2001). It is most likely encountered on outer reef drop-offs due to its preference for steep slopes (G.R. Allen pers. comm. 2006). Juveniles secretive and occur below 25 m (Myers 1991). This species feeds on sponges and tunicates (Pyle 2001).
Threespot angelfish threats
There appear to be no major threats to this species. Collection is limited and is not considered to be impacting the global population.