Thai National Parks

Marine spacies of Thailand

Species of Thailand

Blue triggerfish

Binomial name: Pseudobalistes fuscus, Marcus Elieser Bloch & Johann Gottlob Theaenus Schneider, 1801

Pseudobalistes fuscus, common names blue triggerfish or rippled triggerfish, yellow-spotted triggerfish and blue-and-gold triggerfish, is a fish belonging to the family Balistidae.


Pseudobalistes fuscus can reach a length of 55 centimetres (22 inches) in males. The body is mainly brown, but fins have yellow margins. Juveniles are yellowish brown with a network of brilliant bluish wavy lines. With growth these lines become interconnected.

This fish is known for its aggressiveness and many divers choose to stay away from them, as they bite often.


This species is widespread in the Tropical Indo-Pacific, from the Red Sea to South Africa, Society Islands, southern Japan, Australia and New Caledonia.


Yellow-spotted triggerfish is a reef-associated species. It prefers coastal waters, shallow lagoons and seaward reefs, at 30 - 50 m of depth.


This triggerfish, like most other triggerfish, eats shellfish, small crustaceans, and other bottom-dwelling invertebrae.

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Scientific classification

Pseudobalistes fuscus


  • Balistes rivulatus, Eduard Rüppell (1837)
  • Balistes caerulescens, Eduard Rüppell (1829)
  • Balistes fuscus, Marcus Elieser Bloch & Johann Gottlob Theaenus Schneider (1801)

Range map of Pseudobalistes fuscus in Thailand

Important note; our range maps are based on limited data we have collected. The data is not necessarily accurate or complete.

Special thanks to Ton Smits, Parinya Pawangkhanant, Ian Dugdale and many others for their contribution for range data.

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