Pomacanthus rhomboides (Old woman angelfish) is a large angelfish growing up to 45cm, found in the western Indian Ocean. Adult P. rhomboides are brown with the back third of the body (closest to the caudal fin) being light blue whilst immature specimens are black with wavering blue and white bands, these specimens can be confused with many other Pomacanthus angelfish because of their very similar coloration. Adults of this species can often be found in small groups feeding at the surface or in midwater whilst immature specimens are usually found singularly in tidal pools.