Johnrandallia nigrirostris

Barberfish | Blacknose Butterflyfish
Johnrandallia nigrirostris
Johnrandallia nigrirostris, Galapagos Islands, Ecuador, Photo: Graham Edgar
Johnrandallia nigrirostris
Johnrandallia nigrirostris, Malpelo Island, Colombia, Photo: Graham Edgar
1 / 2
Johnrandallia nigrirostris
Johnrandallia nigrirostris


Tropical Eastern Pacific


Head pale grey, with a black band around snout, black blotch over eye, pale yellow body, yellow lateral line, and an oblique black band from mid back to upper tail base. Has been observed cleaning parasites off larger fishes.


Max Size: 20 cm

Sea Temperature Range: 21.3-30.3°C

Depth: 6-40m

Habitat Generalization Index: 25.4

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: Widespread (60.3% 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: Several (7 per transect)

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

Edit by: Joe Shields