Yellowback Tubelip

Interesting Info

• The Yellowback Tubelip, is a small wrasse found throughout the Indo-Pacific, including northern Australia (Great Barrier Reef and Coral Sea), Indonesia, Papua New Guinea, the Philippines, and west to the Maldives.
• Adults are easily identified by their bright yellow back and upper body contrasted against a darker lower body, giving the fish a striking two-tone appearance.
• Juveniles are more cryptically coloured, often with pale bodies and darker markings that help them blend among coral branches until they mature.
• Both adults and juveniles possess fleshy, tubular lips — a specialised feeding adaptation that allows them to feed directly on coral mucus and polyps.
• Their bright lips are often orange or reddish in colour, standing out against the yellow and brown body tones.
• This species feeds almost exclusively on living coral, particularly the mucus of branching Acropora and Pocillopora corals, making it a coral obligate feeder.
• They play a specialised role in reef ecosystems but are highly vulnerable to coral bleaching and habitat degradation due to their strict dependence on live coral.
• The Yellowback Tubelip is shy and often seen darting quickly into coral heads when approached by divers or predators.
• Males and females look very similar, though males may show slightly brighter yellow coloration during courtship or dominance displays.
• Like many wrasses, they are thought to be protogynous hermaphrodites, with females capable of changing sex to become dominant males when required.
• Spawning behaviour is not well studied but is likely pelagic, with eggs drifting in the plankton until hatching.
• Their lifespan is poorly documented, but related tubelip wrasses live around 4–6 years in the wild.
• The species name xanthonota comes from Greek, meaning “yellow back,” a reference to its distinctive golden upper body coloration.