Balistoides viridescens

Giant triggerfish | Black-lipped Triggerfish | Blue-finned Triggerfish | Bluefin Triggerfish | Dotty Trigger-fish | Moustache Triggerfish | Titan Triggerfish
Balistoides viridescens
Balistoides viridescens, Photo: Rick Stuart-Smith
Balistoides viridescens
Balistoides viridescens, Raja Ampat, Indonesia, Photo: Graham Edgar
Balistoides viridescens
Balistoides viridescens, Bali, Indonesia, Photo: Ian Shaw
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Balistoides viridescens
Balistoides viridescens
Balistoides viridescens


Tropical Indo-Pacific


Greyish body with light scale margins forming a crosshatch pattern, dark ‘moustache’ behind mouth, separating light chin from yellow cheek, white tail base and yellow rear tail with a black rear margin. Aggressive when nesting in coral rubble, confronting divers ferociously.


Max Size: 75 cm

Sea Temperature Range: 22.4-31.7°C

Depth: 1-50m

Habitat Generalization Index: 7.37

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 (8.2% 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: Solitary (1 per transect)

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

Edit by: Joe Shields