Fusiliers are members of the Caesionidae family. They are distributed in the Indo-West Pacific water. They are marine fishes that inhabit mostly on coral reefs and occur near the surface to depths of 60 m. The fusiliers can be recognized by their protractile small mouth and deeply forked caudal fin. Their appearance are closely related to Paracaesio genus in the snappers family.
Fusiliers feed by picking zooplankton. They occur in large schools in mid-water over the reef, along steep outer reef slopes and around deep lagoon pinnacles. More than one species can be found together in a school. They are active swimmers during daytime and shelter within the reef at night.
There are 4 genera and about 22 species of Caesionidae worldwide. Malaysia has all 4 genera and about 15 species.