Halichoeres nigrescens

Bubblefin Wrasse | White-button Wrasse
Halichoeres nigrescens
Halichoeres nigrescens, juvenile, Great Barrier Reef, QLD, Photo: Graham Edgar
Halichoeres nigrescens
Halichoeres nigrescens, male, Great Barrier Reef, QLD, Photo: Rick Stuart-Smith
Halichoeres nigrescens
Halichoeres nigrescens, Dampier, WA, Photo: Andrew Green
Halichoeres nigrescens
Halichoeres nigrescens, male, Dampier, WA, Photo: Graham Edgar
Halichoeres nigrescens
Halichoeres nigrescens, Dampier, WA
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Halichoeres nigrescens
Halichoeres nigrescens
Halichoeres nigrescens
Halichoeres nigrescens
Halichoeres nigrescens

Distribution

Tropical Indo-Pacific


Description

Green body, pale red stripes along side that break apart and interconnect towards rear, dark stripe from snout to eye, black mark at base of pectoral fin, small black spot on upper tail base and yellow corners on tail fin. Juveniles with four white spots on side, which expand to become short vertical bars breaking the body stripes of adults.


Information

Max Size: 14 cm

Sea Temperature Range: 20.2-32.2°C

Depth: 3-10 m

Habitat Generalization Index: 13.11

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: Infrequent (9.4% 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: Many (16 per transect)

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


Edit by: Joe Shields