Stethojulis trilineata

Blue-ribbon wrasse | Three-lined Wrasse | Three-ribbon Wrasse | Threeline Rainbowfish
Stethojulis trilineata
Stethojulis trilineata, male, Bali, Indonesia, Photo: Ian Shaw
Stethojulis trilineata
Stethojulis trilineata, female, Samoa, Photo: Graham Edgar
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Stethojulis trilineata
Stethojulis trilineata


Temperate Australasia, Temperate northern Pacific, Tropical Indo-Pacific


Continuation of 3 blue lines along length of body distinguishes the male from other Stethojulis species. Females similar to S. bandanensis, but have horizontal light stripes, and lack yellow on snout and distinct scales on underside.


Max Size: 15 cm

Sea Temperature Range: 20.3-31.3°C

Depth: 0-20 m

Habitat Generalization Index: 2.54

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 (2.5% 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 (2 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