What Divers Should Know About Triggerfish

Found in tropical and subtropical oceans worldwide, triggerfish are particularly diverse across the Indo-Pacific. Divers most commonly encounter these often brightly colored and distinctly marked fish in relatively shallow, coastal habitats, especially among coral reefs. While most species prefer reef environments, some, like the oceanic triggerfish, inhabit the open ocean.

This family of fish typically reaches a maximum length between 20 and 50 cm, though the impressive stone triggerfish can grow up to a meter. Recognizable by their oval, compressed bodies and tough, armor-like scales, triggerfish possess strong-jawed mouths with teeth adapted for crushing shells. They are known for their unique protective mechanism: an anterior dorsal spine that locks into place with a second "trigger" spine, allowing them to anchor themselves securely within reef crevices. While fascinating to observe, many species are notoriously ill-tempered, a behavior divers should note.