Inhabits channels, moats, and seaward reefs with strong surge. A wary species, typically occurring in small groups, in very shallow surgy water. Mainly diurnal, it feeds on coarse leafy brown algae like @Sargassum@. Pair-spawning has been observed. Rarely poisonous around Tahiti but few cases of poisoning have been reported from the Leeward Is. and the Marquesas islands (Ref. 4795).