Galapagos Gregory, Galapagos Gregory, Island Major
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
Habitat: Coral Reef, Rocky Reef
Habitat Generalisation Index: 23.7
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
IUCN Threat Status: Least Concern
Occurrence: Common (24% 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.