Orange-lined Triggerfish Identification Guide
Recognize this reef triggerfish by its striking orange wavy lines running diagonally across a dark olive body.
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Key identification features
- Elongated, moderately compressed body reaching about 30 cm (12 in)
- Dark olive to greenish-brown base color overlaid with bold, wavy orange diagonal lines across the body
- Bright orange patch at the base of the tail
- Blue-tinted markings around the eye and dorsal fin base in some individuals
- Small, independently erectile "trigger" spine on the first dorsal fin
Common look-alikes
- Undulate triggerfish naming aside, no other common reef triggerfish shares this exact combination of dark olive body with orange wavy lines, making misidentification unlikely once seen clearly.
- Redtooth triggerfish (Odonus niger): lacks any orange line pattern, instead showing a solid blue-purple body with red teeth, a completely different overall look.
Where you'll see one
Widespread across the Indo-Pacific on coral reefs, lagoons, and reef flats, typically at shallow to moderate depths. It is often seen alone, actively patrolling reef structure while foraging on invertebrates, coral polyps, and algae, and can become territorial when approached too closely near shelter.
Frequently asked questions
How do I quickly recognize an Orange-lined Triggerfish?
Its dark olive body crossed with bold orange wavy diagonal lines, plus an orange patch at the tail base, is distinctive and not shared by other common triggerfish.
Could I confuse it with the Redtooth Triggerfish?
No, the Redtooth is solid blue-purple without any orange line pattern, so the two are easy to separate at a glance.