Johnrandallia nigrirostris
Spot barberfish in the Galapagos, Baja California, and Coiba, an omnivore reef fish most common Nov, May in Mexican and Costa Rican Pacific waters.
A disc-shaped butterflyfish about the size of a spread hand, the barberfish is vivid yellow with a bold black mask running across the eye and a distinctively dark snout, that black nose is the key field mark underwater. The body is laterally compressed (flattened side-to-side), typical of the butterflyfish family, and the yellow fades to a paler wash toward the belly. At 14 cm it is small enough to be overlooked against busy reef backdrops, so scanning rock faces and coral edges pays off.
Barberfish are most often seen hovering close to the reef structure, rocky outcrops, ledges, and coral heads, where they pick at small invertebrates and algae. They are generally curious and approachable, holding their position or moving slowly rather than bolting when a diver draws near. The species is also well known for acting as a cleaner fish, setting up at cleaning stations where it picks parasites from larger fish, including sharks and rays, which is a memorable interaction to watch.
Barberfish regularly service cleaning stations, where large fish including sharks queue up and adopt a passive posture while the barberfish methodically removes external parasites. Watching this interaction at a busy station is one of the most compelling reasons to seek them out.
In Northern Hemisphere destinations such as Baja California and Costa Rica, sightings concentrate between November and May. At Southern Hemisphere sites including the Galapagos, divers log them most often from March through August.
Barberfish are an Eastern Pacific species, logged most widely across Mexico, Costa Rica, and Ecuador, with Baja California, the Gulf of Papagayo, and the Galapagos Islands standing out as particularly reliable areas. Strong populations are also recorded in Coiba National Park (Panama) and at the remote offshore seamount Malpelo (Colombia). Sightings reach into Peruvian waters at the southern end of the range, reflecting the species' tolerance for cooler upwelling temperatures down to around 18 °C.
Mapping where Barberfish is logged…
Barberfish are found across the Eastern Pacific. The most reliable diving is in Baja California (Mexico), the Papagayo Gulf (Costa Rica), the Galapagos Islands (Ecuador), and Coiba National Park (Panama). Malpelo in Colombia is another notable hotspot for the species.
In Mexico and Costa Rica, sightings are most frequent from November through May. If you're diving the Galapagos or other Southern Hemisphere sites, aim for March to August. The species tolerates a wide temperature range, so off-peak visits can still produce sightings.
Look for the black snout, no other common butterflyfish in the Eastern Pacific has that dark nose combined with a bright yellow body and a black eye mask. The disc-shaped body and small size (around 14 cm) are also typical. Once you've seen that black-tipped face, you won't mistake it.
Barberfish typically reach about 14 cm in length, roughly the size of a spread adult hand. They are on the smaller side for reef fish, which is worth keeping in mind when scanning busy reef walls.
Yes, barberfish are one of the Eastern Pacific's best-known cleaner fish. They set up cleaning stations on the reef where larger fish, including sharks and rays, hold still while the barberfish picks off parasites. Spotting an active cleaning station is one of the highlights of diving with this species.
Site and sighting data is aggregated from diver logs, iNaturalist and GBIF. For taxonomy and conservation status:
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