HomeMarine aquarium fishOther marine fishSmallmouth squirrelfish Smallmouth squirrelfish (Sargocentron microstoma) Scientific name: Sargocentron microstoma G?nther, 1859 The Smallmouth squirrelfish (Sargocentron microstoma) is a marine fish of the family Holocentridae. BiologyDorsal spines (total): 11; Dorsal soft rays (total): 12-14; Anal spines: 4; Anal soft rays: 9 - 10. Body with red and white stripes of different widths; head reddish above, silvery below; faint red band from eye to angle of preopercle; spinous dorsal white, with a submarginal zone of red. Five oblique scale rows on cheek; body moderately elongated, depth 2.9-3.5 in SL; head length (HL) 2.8-3.4 in SL; snout length 3.9-4.35 in HL; interorbital width 4.15-4.5 in HL; maxillary reaching to about below front of iris, upper jaw length 2.85-3.15 in HL; premaxillary groove reaching to about a vertical at the front edge of orbit; anterior end of nasal bone rounded; 1-2 spinules at medial margin of nasal bone; small nasal fossa without spinules on its edge (except a 16.3 cm specimen from the Society Islands with 1 spinule); upper edge of suborbital bone weakly serrated, spineless laterally; short preopercular spine 1/4-1/3 orbit diameter, 6.15-7.95 in HL; 3rd-5th dorsaSource: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameSargocentron microstomaFamilyHolocentridae (Squirrelfishes, soldierfishes)OrderBeryciformes (Sawbellies)ClassActinopterygii (Ray-finned fishes)Maximum length20.0Depth range1–183 m (3–600 ft)EnvironmentMarine; reef-associated; depth range 1 - 183 m, usually 1 - 35 mClimateTropicalDistributionIndo-Pacific: Chagos Archipelago, Astove in Seychelles, and Maldives to the Hawaiian, Line, and Tuamoto Islands, north to the Ryukyu and Bonin Islands, south to Austral Islands; throughout Micronesia.Conservation status (IUCN)Not EvaluatedThreat to humansVenomousUsesAquarium: public aquariumsResilienceHigh, minimum population doubling time less than 15 months (K=1.00) More other marine fishStriped monocle breamScolopsis lineataTwo-lined monocle breamScolopsis bilineataBrown chubKyphosus bigibbusArabian monocle breamScolopsis ghanamSilver sweeperPempheris oualensisMoontail bullseyePriacanthus hamrurSee all other marine fish SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026