Sargocentron microstoma

Smallmouth Squirrelfish | Finelined Squirrelfish | Silver Squirrelfish | Slender Squirrelfish
Sargocentron microstoma
Sargocentron microstoma, Photo: Graham Edgar
Sargocentron microstoma
Sargocentron microstoma, Iles Maria, Austral Islands, Pacific Ocean, Photo: Rick Stuart-Smith
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Sargocentron microstoma
Sargocentron microstoma


Tropical Indo-Pacific


Silver/white lines of unequal width, long 3rd anal fin spine extends past tail base, and a yellow patch on operculum. Hides in crevices and holes in coral reef, especially favours staghorn corals.


Max Size: 20 cm

Sea Temperature Range: 23.3-30.4°C

Depth: 1-183m

Habitat Generalization Index: 2.41

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: Not Evaluated

Occurrence: Infrequent (4.0% 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: Few (3 per transect)

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

Edit by: RD Stuart-Smith, GJ Edgar, AJ Green, IV Shaw. 2015. Tropical Marine Fishes of Australia. Reed New Holland