Shorefishes of the Eastern Pacific online information system

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Species: Johnrandallia nigrirostris, Barberfish butterflyfish, Blacknose butterflyfish

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head white + 2 black bars
body & fins yellow
rear back profile: oblique black bar

Johnrandallia nigrirostris (Gill, 1862)

Barberfish butterflyfish, Blacknose butterflyfish

Body a strongly compressed oval disc; mouth small, at end of a short, pointed snout that is ~ 33% head length; teeth long and slender; dorsal fin with XII spines, 4th  spine longest, spines decreasing in size behind that one, 24-25, membranes between anterior dorsal spines moderately incised; anal rays III, 18-20, 2nd  anal spine longer than 3rd; rear edges of dorsal and anal fins rounded; tail edge straight; lateral line complete, with 52-63 scales; scales rough, covering dorsal and anal fins as well as head and body.

Head whitish, body yellow; black bands on snout, across eyes and forehead, and along base of dorsal fin; also a black area around eye; edge of gill cover black.

Maximum size, 20 cm.

Habitat: usually seen in small to very large aggregations on reefs.

Depth: 5-40 m.

Central Baja to the central Gulf of California to central Peru, also all the offshore islands.

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  • Marine
  • Marine Only
  • Inshore
  • Inshore Only
Water Column Position
  • Near Bottom
  • Bottom
  • Bottom + water column
  • Mid Water
  • Reef only
  • Reef (rock/coral/oyster)
  • Reef associated (reef + edges-water column & soft bottom)
  • Corals
  • Rocks
  • Water column
FishBase Habitat
  • Reef Associated
Feeding Group
  • Planktivore
  • Ectoparasite cleaner
  • Data
  • Carnivore
  • Sessile molluscs
  • Sessile crustacea
  • Ectoparasites
  • Benthic microalgae
  • Data
  • Zooplankton
  • Sessile worms
Egg Type
  • Pelagic larva
  • Pelagic
  • No data
Global Endemism
  • East Pacific endemic
  • All species
  • Tropical Eastern Pacific (TEP) endemic
Regional Endemism
  • Continent
  • Island (s)
  • TEP endemic
  • Continent + Island (s)
  • All species
  • Resident
Climate Zone
  • South Temperate (Peruvian Province )
  • Northern Tropical (Mexican Province to Nicaragua + Revillagigedos)
  • Northern Subtropical (Cortez Province + Sinaloan Gap)
  • Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
IUCN Red List
  • Listed
  • Least concern
  • Not listed
Depth Range Max
  • 40
Depth Range Min
  • 5
Length Max
  • 20