Identification
Bicolor Angelfish are yellow anteriorly and blue posteriorly. There is a blue bar above the eyes and the caudal fin is yellow.
Angelfishes are related to the butterflyfishes (Family Chaetodontidae). The Angelfishes have a distinctive preopercular spine that is lacking in the butterflyfishes.
- See more at: http://australianmuseum.net.au/bicolor-angelfish-centropyge-bicolor-bloch-1787#sthash.fUYwlPxf.dpuf