Genicanthus semicinctusHalfbanded Angelfish
Temperate Australasia, Tropical Indo-Pacific
Males grey with black narrow vertical bands on upper body, orange-brown unmarked belly, orange tinge on back and dorsal fin, swallow tail with black spots, blue margins on orange upper and lower lobes and trailing filaments. Vertical bands less dense than on similar G. melanospilos (Swallowtail Angelfish) and absent over top of head. Females dark grey on upper body and pale on belly with blue margins on median fins and a blue arc encasing a black blotch above eye. Length to 21 cm.
Max Size: 20 cm
Sea Temperature Range: 19-24.8°C
Depth: 10-100 m
Habitat Generalization Index: N/A
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: Frequent (11.3% 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: Few (2 per transect)
Abundance is calculated as the average number of individuals recorded per RLS transect, where present.
Edit by: Joe Shields