Thalassoma nigrofasciatum

Blackbarred Wrasse
Thalassoma nigrofasciatum
Thalassoma nigrofasciatum, adult, NSW, Australia, Photo: Ian Shaw
Thalassoma nigrofasciatum
Thalassoma nigrofasciatum, Lord Howe Island, NSW, Australia, Photo: Rick Stuart-Smith
1 / 2
Thalassoma nigrofasciatum
Thalassoma nigrofasciatum


Tropical Indo-Pacific


Dark grey to black upper body with yellow edged white bars the extend down to white belly, oblique yellow streak on rear margin of operculum, yellow or white tail base. Proportionally longer pectoral fins, and with fewer white bars on body than juvenile T. jansenii (Jansen's wrasse). Swims continuously and quickly, low over the top of the reef. South-west Pacific only.


Max Size: 20 cm

Sea Temperature Range: 19.1-29.8°C

Depth: 0-15m

Habitat Generalization Index: 28.11

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 (43.3% 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 (7 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