Thalassoma hardwicke

Six-bar wrasse | Six-banded Wrasse
Thalassoma hardwicke
Thalassoma hardwicke, adult, Lord Howe Is, NSW, Photo: Andrew Green
Thalassoma hardwicke
Thalassoma hardwicke, juvenile, QLD, Australia, Photo: Rick Stuart-Smith
Thalassoma hardwicke
Thalassoma hardwicke, adult, QLD, Australia, Photo: Joe Shields
Thalassoma hardwicke
Thalassoma hardwicke, NSW, Australia, Photo: Ian Shaw
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Thalassoma hardwicke
Thalassoma hardwicke
Thalassoma hardwicke
Thalassoma hardwicke


Tropical Indo-Pacific


Six dark, dagger-like bars along the side, reducing in size towards the rear of the body. Juveniles with black spots on front and middle of dorsal fin.


Max Size: 20 cm

Sea Temperature Range: 19.1-31.2°C

Depth: 0-15 m

Habitat Generalization Index: 28.1

Also referred to as the SGI (Species Generalisation Index), this describes the habitat niche breadth of the species. Species with values less than 15 are found in a relatively narrow range of reef habitat types (specialists), while those over 25 may be found on most hard substrates within their range (generalists). Learn more here.

Conservation and Rarity

IUCN Status: Least Concern

Occurrence: Common (36.3% of sites)

Occurrence describes how often the species is found on surveys within its distribution. It is calculated as the % of reef sites surveyed by RLS divers across all the ecoregions in which the species has been observed

Abundance: Several (8 per transect)

Abundance is calculated as the average number of individuals recorded per RLS transect, where present.

Edit by: RD Stuart-Smith, GJ Edgar, AJ Green, IV Shaw. 2015. Tropical Marine Fishes of Australia. Reed New Holland