Chromis nigrura
Blacktail chromis
Chromis nigrura, adult, Photo: Rick Stuart-SmithSame Genus
Distribution
Tropical Indo-Pacific
Description
Lines of blue spots along a brown body, blue anal fin, blue margin on dorsal fin and a yellow tail. Very similar to C. vanderbilti and C. lineata, but lacking tiny golden spot below rear dorsal fin base, and confined to Indian Ocean. An Indian Ocean species, in Australia only found at Christmas Island.
Information
Max Size: 6 cm
Sea Temperature Range: 25.9-30.4°C
Depth: 1-30m
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: Not Evaluated
Occurrence: Widespread (55.6% 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: Large aggregations (260 per transect)
Abundance is calculated as the average number of individuals recorded per RLS transect, where present.