page_title: Blue ring angelfish
section_title: Description
hierarchical_section_title: Blue ring angelfish / Description
caption_attribution_description: English: Fish Blue ring angelfish, Pomacanthus annularis in Prague sea aquarium, Czech RepublicČeština: Ryba pomec prstenčitý, (Pomacanthus annularis) v pražském mořském akváriu Mořský svět v Holešovicích
context_page_description: The blue ring angelfish, also known as the Annularis Angelfish and the Blue King Angelfish, is an angelfish of the family Pomacanthidae. It is member of the genus Pomacanthus, composed of large marine angelfish.
context_section_description: Pomacanthus annularis can reach a body length of about 45 cm (18 in), but usually the total body length get up to about 30 cm (12 in). Bodies are deeply compressed and the mouth is quite small. They have 13 dorsal spines, 20-21 dorsal soft rays, 3 anal spines and 20 anal soft rays. 
  Adults of the blue ring angelfish exhibit a dark orange to brown or violet coloring with  a blue ring near their head (hence the common name) and blue horizontal semicircular marks on the middle of the body. Two blue stripes cross the face. The caudal fin is white. Juveniles of the blue ring angelfishes are at first a dark blue, almost black, with broad turquoise and white vertical stripes.
  These fishes show a considerable resemblance to the Emperor Angelfish in that it undergoes changes in coloring in its development from youth to maturity.
caption: In Prague Sea aquarium
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