Eggs
The female lays in a bowl dug in the sand and guards the nest.
Four-stage life cycle
Triggerfish
A powerful-toothed fish with an oval body
An oval, laterally compressed bony fish, the triggerfish has extremely strong teeth able to crush sea urchins and shells. It fiercely defends its nest.
Life cycle (4 stages)
Larva
Larvae hatch quickly and drift in the plankton.
Juvenile
Young fish join the reef and hide in crevices.
Adult
Territorial, it defends its nest, sometimes aggressively, during breeding.
Physical changes
- Oval body strongly compressed laterally.
- Lockable first dorsal spine that wedges the fish inside a crevice.
- Powerful chisel-shaped teeth.
- Highly variable colouring depending on species and age.
Habitat
- Coral reefs
- Outer slopes
- Sandy lagoon bottoms
- Tropical Indo-Pacific waters
Diet
- Sea urchins
- Shellfish
- Crustaceans
- Corals
- Algae
Survival adaptations
- Jaws able to break the hardest shells.
- Locking dorsal spine to anchor inside a hole.
- Undulating dorsal and anal fins for precise hovering.
- Highly defensive territorial behaviour.
Ecological importance
- Regulating sea urchin populations that erode coral
- Turning over sand and oxygenating the substrate
- Contributing to reef balance
Importance
- Type : Reef bony fish (Balistidae family)
- Habitat shift : Sandy nest → Planktonic larvae → Reef juveniles → Territorial adults
- Role : Invertebrate predator that indirectly protects coral.
- Vital for urchin control and the health of coral reefs.
Did you know?
During nesting season a titan triggerfish may charge divers who come too close: always leave its territory sideways, never upwards.