Pomacanthus semicirculatus
Half-circled angelfish | Blue Angelfish | Koran Angelfish | Semicircle Angelfish | Zebra Angelfish
Pomacanthus semicirculatus, adult, Photo: Rick Stuart-Smith
Pomacanthus semicirculatus, juvenile, NSW, Australia, Photo: Ian Shaw
Pomacanthus semicirculatus, adult, Bali, Indonesia, Photo: Ian Shaw
Pomacanthus semicirculatus, juvenile, NSW, Australia, Photo: Tom Davis
Distribution
Tropical Indo-Pacific
Description
Olive head grading to dark rear body and tail with contrasting scale edges, forming dark spots on body, and light spots on dorsal, anal and tail fins. Operculum with blue spine and margin, fins with blue trim, dorsal and anal fins with trailing elongated tips. Juveniles with curved blue and white lines on dark body, lacking complete circular marking of P. imperator (Emperor Angelfish). Length to 40 cm.
Information
Max Size: 40 cm
Sea Temperature Range: 19.9-31.2°C
Depth: 1-30m
Habitat Generalization Index: 11.07
Also referred to as the SGI (Species Generalisation Index), this describes the habitat niche breadth of the species. Species with values less than 15 are found in a relatively narrow range of reef habitat types (specialists), while those over 25 may be found on most hard substrates within their range (generalists). Learn more here.
Conservation and Rarity
IUCN Status: Least Concern
Occurrence: Infrequent (9.5% of sites)
Occurrence describes how often the species is found on surveys within its distribution. It is calculated as the % of reef sites surveyed by RLS divers across all the ecoregions in which the species has been observed
Abundance: Solitary (1 per transect)
Abundance is calculated as the average number of individuals recorded per RLS transect, where present.
Edit by: Joe Shields