Heniochus monoceros

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Heniochus monoceros
Heniochus monoceros, adult, Coral Sea, Australia, Photo: Ian Shaw
Heniochus monoceros
Heniochus monoceros, Coral Sea, Australia, Photo: Rick Stuart-Smith
Heniochus monoceros
Heniochus monoceros, Coral Sea, Australia, Photo: Andrew Green
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Heniochus monoceros
Heniochus monoceros
Heniochus monoceros


Temperate Australasia, Tropical Indo-Pacific


White with three dark brown bands, the first on head over eyes, the last diffuse and incomplete. Rear of body gradating to yellow. Small horn on forehead, like H. singularis and H. varius, but has largely white and yellow anal fin rather than largely black.


Max Size: 24 cm

Sea Temperature Range: 20.5-30.8°C

Depth: 2-30m

Habitat Generalization Index: 8.98

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 (6.5% 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: Few (2 per transect)

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