Stegastes arcifrons

Galapagos gregory | Island Major
Stegastes arcifrons
Stegastes arcifrons, Galapagos Islands, Ecuador, Photo: Graham Edgar


Tropical Eastern Pacific


Relatively large damselfish with large visible scales, exhibits geographical colour variations, usually a dark body with gold or yellow tail and shading on body. Adults are territorial and aggressive, attacking and driving off other fishes entering their territory. Juveniles with a large ocellus on dorsal fin.


Max Size: 13 cm

Sea Temperature Range: 21.3-29.8°C

Depth: 1-20m

Habitat Generalization Index: 23.73

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 (23.6% 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: Large aggregations (201 per transect)

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

Edit by: Joe Shields