Pomacanthus asfur. Both the juvenile and adult are quite pretty and hardy, with the juvenile having a blue body with light-blue and white stripes. As it ages, it will develop yellow markings on its dorsal and the tail fin will turn yellow. As for the adult, it has an overall dark blue body, blackish face, yellow tail and a wide crescent-shaped yellow band down both sides of the body. Captive-bred specimens are sometimes referred to as ‘Half Moon’ Angelfish.