Chaetodon baronessa

Triangular butterflyfish | Eastern Triangular Butterflyfish | Pacific Triangular Butterflyfish | Triangle Butterflyfish
Chaetodon baronessa
Chaetodon baronessa, Raja Ampat, Indonesia, Photo: Rick Stuart-Smith
Chaetodon baronessa
Chaetodon baronessa, juvenile, Bali, Indonesia, Photo: Ian Shaw
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Chaetodon baronessa
Chaetodon baronessa


Tropical Indo-Pacific


Body shape and markings distinctive, only similar to Chaetodon triangulum (not known from Australia). Distinguished primarily on distribution, but in area of potential overlap in North West Australia, by yellow margin around entire tail in C. triangulum.


Max Size: 16 cm

Sea Temperature Range: 23.4-31.4°C

Depth: 5-20

Habitat Generalization Index: 11.18

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 (25.2% 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.

Edit by: RD Stuart-Smith, GJ Edgar, AJ Green, IV Shaw. 2015. Tropical Marine Fishes of Australia. Reed New Holland