Halichoeres dimidiatus

Halichoeres dimidiatus
Halichoeres dimidiatus, Abrolhos, Bahia, Brazil, Photo: Graham Edgar


Tropical Atlantic/Caribbean


Bright yellow top of head and back, blue sides, pale belly and broad yellow margin on tail fin. An oblique dark yellow bar edged in blue extends above and behind the eye. Adults usually found in deeper waters, below 20m, juveniles in shallower waters where they act as cleaners to larger fish.


Max Size: 19 cm

Sea Temperature Range: 24.6-28°C

Depth: 3-60m

Habitat Generalization Index: N/A

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 (33.3% 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: Solitary (1 per transect)

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

Edit by: Joe Shields