Chlorurus atrilunula

Bluemoon parrotfish
Chlorurus atrilunula
Chlorurus atrilunula, female, Seychelles, Photo: Rick Stuart-Smith
Chlorurus atrilunula
Chlorurus atrilunula, female, Tanzania, Photo: Rick Stuart-Smith
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Chlorurus atrilunula
Chlorurus atrilunula



Terminal phase males with distinctive tail with dark bar near the rear edge. Females very similar to, and almost indistinguishable from C. capistratoides, although the reliability of available images is uncertain. This species believed to only be found along the eastern African coast.


Max Size: 30 cm

Sea Temperature Range: 25.3-29.9°C

Depth: N/A

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: Common (28.6% 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 (3 per transect)

Abundance is calculated as the average number of individuals recorded per RLS transect, where present.