Shoulderspot Wrasse

Interesting Info

• The Shoulderspot Wrasse, is a reef-associated species widely distributed across the tropical Indo-Pacific, including northern Australia, the Great Barrier Reef, Coral Sea, Western Australia, and offshore islands such as Christmas and Cocos (Keeling).
• The species is named for the distinctive dark shoulder spot, located just behind the gill cover, which is most prominent in females and juveniles.
• Males are more brightly coloured, typically green to bluish with faint orange lines along the face and body, while females and juveniles are reddish to pinkish with the characteristic dark shoulder blotch.
• Sexual dimorphism is pronounced: as females transition to males, they lose the shoulder spot and develop the brighter blue-green colouration characteristic of terminal-phase males.
• Like many wrasses, they are protogynous hermaphrodites, beginning life as females before some transform into males to maintain social hierarchies within populations.
• The Shoulderspot Wrasse is a diurnal feeder that consumes small benthic invertebrates, including polychaete worms, amphipods, and tiny crustaceans, foraged from sandy and rubble substrates near reefs.
• They often forage in loose groups, hovering close to the substrate and picking prey from sand patches and seagrass beds.
• Spawning occurs in small groups, with males courting multiple females. Eggs are pelagic, drifting in the plankton before hatching.
• Their lifespan is not well studied, though similar small wrasses live approximately 5–7 years in the wild.
• Juveniles and initial-phase females rely on their dark shoulder spot as disruptive camouflage, helping to break up their body outline against reef and seagrass backgrounds.