Inhabit offshore coral reefs and also inshore rocky and coral reefs (Ref. 30573). Juveniles frequent mangrove estuaries and lower reaches of freshwater streams (Ref. 30573, 48635). Adults on clear outer reefs at moderate depths, usually over 20 m, and is more common in about 50 m depth (Ref. 48635). Feed on benthic invertebrates and fish (Ref. 5213). In Hong Kong live fish markets (Ref. 27253).