Barberfish in Los Cabos

How to recognize it

A strongly compressed, oval, disc-shaped body with a short, pointed snout and a small mouth. The head is whitish to pale gray and the body and fins are yellow, with a yellow lateral line arching along the side. Look for a black band around the tip of the snout, a black band across the forehead and over the eyes, a dark area around the eye and a black edge on the gill cover. A black band runs along the base of the dorsal fin, from the middle of the back to the top of the tail base.

Biology

The barberfish lives only in the tropical eastern Pacific, from central Baja and the central Gulf of California to central Peru, including all the offshore islands. It is a resident of rocky and coral reefs from 5 to 50 m deep. It is usually seen in small to very large groups. In fish counts at Cabo Pulmo between 1987 and 1998 it was rated common and turned up in 75 to 100% of censuses, one of only eleven species seen that often.

It feeds by day on algae, small snails and small crustaceans, and it is best known as a cleaner. Barberfish hold cleaning stations where larger fish come to have parasites picked off; FishBase lists Pacific creolefish and Mexican goatfish among its clients. At night it shelters close to the reef. Pairs form for breeding.

Seeing them from the boat

The barberfish is a fish for snorkelers and divers, not anglers. It is common on rocky reefs around Los Cabos and Cabo Pulmo, often in groups, and it is easy to watch at work cleaning bigger fish. It is not a sport fish.

Its mouth is tiny, so it is rarely hooked. If one ever comes up, unhook it gently and put it back. Aquarium collectors need a federal fishing permit. Sport fishing is not allowed inside Cabo Pulmo National Park.

Rules & conservation

Not a sport fish. If one is ever hooked, release it.

Don't confuse it with

The threeband butterflyfish (Chaetodon humeralis) is white to silvery, not yellow, with black bars through the eye, over the pectoral fin and near the tail. The scythe butterflyfish (Prognathodes falcifer) is yellow but has a curved black scythe-shaped mark on the side and a mostly black spiny dorsal fin; it usually lives deeper. The barberfish is the one with a whitish head, black snout and mask, and a black stripe along the base of the dorsal fin.

Questions

By Max VargasTop Anglers, Cabo San Lucas · international judge at big game fishing world championships · reviewed October 2026

Sources

• Smithsonian Shorefishes of the Eastern Pacific: Johnrandallia nigrirostris
• FishBase: Johnrandallia nigrirostris
• Reef Life Survey: Johnrandallia nigrirostris
• San Diego Natural History Museum, Ocean Oasis field guide: barberfish
• The ETYFish Project: Chaetodontidae
• Villarreal-Cavazos et al. 2000, fishes of Cabo Pulmo reef (Rev. Biol. Trop.)
• Pancaldi et al. 2022, Revillagigedo shark behavior note (Rev. Biol. Mar. Oceanogr.)
• Gijón-Díaz et al. 2017, ornamental reef fish fishery in Mexico (Rev. Biol. Trop.)
• Smithsonian Shorefishes of the Eastern Pacific: threeband butterflyfish
• Smithsonian Shorefishes of the Eastern Pacific: scythe butterflyfish
• NOM-059-SEMARNAT-2010, 2019 annex (DOF)
• NOM-017-PESC-1994, 2013 amendment (DOF)
• Aburto-Oropeza et al. 2011, fish recovery at Cabo Pulmo (PLoS ONE)

Top illustration: Top Anglers. Photos: iNaturalist contributors, credited on each photo.