Inhabits deep lagoons and along seaward reefs , primarily around coral reefs. Feeds on zooplankton in large midwater aggregations. Oviparous, with numerous, small pelagic eggs .
Dorsal spines (total): 10; Dorsal soft rays (total): 14 - 15; Anal spines: 3; Anal soft rays: 11 - 12. Upper 1/3 of body and caudal fin bright yellow, middle third blue, lower white. 4-5 scales on cheek; 20-25 predorsal scales; scaled dorsal and anal fins; narrow scaleless zone interrupting the Supra-temporal band of scales at the dorsal midline. Upper peduncular scale rows 11 or 12; lower peduncular scale rows usually 15 (14-16). Presence of a small process on each ventrolateral surface of basioccipital for attachment of Baudelot's ligament. Post maxillary process single; posterior end of maxilla blunt . Head length 3.0-3.4 in SL; body depth 2.9-3.5 in SL .: fusiform / normal; Cross section: compressed.
The yellowback fusilier is diurnal, and lives in groups and forms schools with other caesionids such as Caesio teres.
Marine; reef-associated; non-migratory; depth range 0 - 50 m . Tropical; 23°N - 28°S, 32°E - 132°E East Africa (not including the Red Sea and the Arabian (Persian) Gulf) to Indonesia.
zooplankton in large midwater aggregations
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