Abudefduf troschelii

Panama sergeant major
Abudefduf troschelii
Abudefduf troschelii, Panama, Photo: Graham Edgar
Abudefduf troschelii
Abudefduf troschelii, Gulf of California, Mexico, Photo: Rick Stuart-Smith
Abudefduf troschelii
Abudefduf troschelii, Machalilla, Ecuador, Photo: Graham Edgar
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Abudefduf troschelii
Abudefduf troschelii
Abudefduf troschelii


Tropical Eastern Pacific


High silvery body with 6 dark bars, another faint bar on tail base, black spot at pectoral fin base, and a yellow back. Found in large aggregations above the reef.


Max Size: 20 cm

Sea Temperature Range: 20.8-30.4°C

Depth: 1-12m

Habitat Generalization Index: 23.03

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 (31.5% 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: Many (22 per transect)

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

Edit by: Joe Shields