Thalassoma trilobatum

Ladder Wrasse | Christmas Wrasse | Green-barred Wrasse | Green-blocked Wrasse
Thalassoma trilobatum
Thalassoma trilobatum, male, Hawaii, Photo: Graham Edgar
Thalassoma trilobatum
Thalassoma trilobatum, female, Photo: Rick Stuart-Smith
Thalassoma trilobatum
Thalassoma trilobatum, male, NSW, Australia, Photo: Rick Stuart-Smith
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Thalassoma trilobatum
Thalassoma trilobatum
Thalassoma trilobatum


Tropical Indo-Pacific


Snout without markings on male. Females may have spotted face, but lack lines on the snout in 'v' shape, like on T. purpureum (surge wrasse).


Max Size: 30 cm

Sea Temperature Range: 19.1-29°C

Depth: 0-10 m

Habitat Generalization Index: 0.37

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: Infrequent (7.4% 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: Few (4 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