Abudefduf troschelii (Gill, 1862)
Panamic sergeant major
Abudefduf troschelii
photo by Allen, G.R.

Family:  Pomacentridae (Damselfishes), subfamily: Glyphisodontinae
Max. size:  20 cm TL (male/unsexed)
Environment:  reef-associated; marine; depth range 1 - 12 m, non-migratory
Distribution:  Eastern Pacific: throughout the Gulf of California and from Bahía San Juanico, Baja California, Mexico to northern Peru, the Galapagos Islands and other offshore islands.
Diagnosis:  Dorsal spines (total): 13-13; Dorsal soft rays (total): 12-13; Anal spines: 2-2; Anal soft rays: 10-13. With black spot on pectoral fin base.
Biology:  Adults inhabit rocky and coral reefs (Ref. 9334). Usually in large aggregations. These diurnal feeders feed on plankton at the surface or mid-water; also graze on benthic invertebrates and algae on the reef. Breed during early summer in the Gulf and continues throughout the summer until fall. This fish is a warm-water, stenothermal species. Juveniles of second year class have been observed cleaning schools of striped mullet, halfbeaks and needlefish (Ref. 5592). Oviparous, distinct pairing during breeding (Ref. 205). Eggs are demersal and adhere to the substrate (Ref. 205). Males guard and aerate the eggs (Ref. 205).
IUCN Red List Status: Least Concern (LC); Date assessed: 27 May 2007 Ref. (130435)
Threat to humans:  harmless


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