The Semicircle or Semicircled Angelfish is native to shallow, warm seas of the Indo-Pacific, from
East Africa to Fiji/Samoa. Adults are blue-green with blue line markings, fluorescent blue edging and reach 40-45 cm long.
Juveniles, like many Angelfish, are dark blue with white stripes. Juveniles (and sometimes adults) are usually
referred to as Koran Angelfish due to the markings on their tails.