Bryde’s whale in Los Cabos

How to recognize it

A sleek, dark-gray rorqual with a paler underside, slender pointed flippers and a tall, strongly hooked dorsal fin set about two-thirds of the way down the back. The giveaway is the head, about a quarter of the body length: on top it has three parallel ridges running from the snout toward the blowhole, where other rorquals have only one. It has 40 to 70 throat grooves and 250 to 410 coarse gray baleen plates on each side, and it does not lift its flukes when it dives.

Biology

Bryde’s whales live in tropical, subtropical and warm temperate seas between about 40°N and 40°S, in water of about 16–22 °C (61–72 °F). Some populations make short seasonal moves and others stay put all year, which is unusual for a baleen whale. In the Gulf of California they are seen year-round. In Bahía de La Paz, a 2011 study found no clear seasonal pattern, but about ten times more whales in La Niña years, when sardines shifted south. Recordings of their calls suggest two groups in the Gulf: residents in the north, and a mix of residents and visitors from the eastern tropical Pacific in the south.

They eat schooling fish such as sardines, mackerel and herring, plus krill, copepods, red crabs and shrimp: an estimated 600–660 kg (1,320–1,450 lb) a day, taken by lunging, skimming the surface or blowing bubble nets. In the Gulf their main prey is the Pacific sardine. They are usually alone or in pairs, though up to 20 can gather loosely where they feed. They mature at about nine years and can mate in any month, with a peak in autumn; a female has one calf every two to three years after a pregnancy of 10 to 12 months.

Seeing them from the boat

Bryde’s whales are not regular off Cabo. CONANP’s 2023 study for the Cabo San Lucas protected area lists them among the whales recorded there but not frequently, behind humpback, gray and blue whales. Your best chance is in warm blue water offshore, or farther up the Gulf toward La Paz, where they turn up in every season.

If you see a medium-sized rorqual with a tall, hooked fin that keeps changing direction, look for the three ridges on the head. Mexico’s whale-watching rules apply: keep your distance, approach only at an angle from behind and to the side, stay 30 minutes at most, and don’t chase it, fish near it or trail lines.

Rules & conservation

Don't confuse it with

The fin whale is much bigger (up to 26 m), with a single ridge on the head and a lower jaw that is white on the right side only. The sei whale is about the same size but has a single head ridge, and its dorsal fin usually shows at the same time as the blowhole. The minke whale is smaller (up to about 11 m) and in the North Pacific has a white band on each flipper. The humpback is bulkier, with very long flippers and a knobby head, and lifts its flukes to dive.

Questions

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

Sources

• NOAA Fisheries: Bryde’s whale
• Salvadeo et al. 2011, Bryde’s whale in the southwestern Gulf of California and ENSO (Ciencias Marinas)
• Viloria-Gómora et al. 2021, geographic variation in Bryde’s whale Be4 calls in the Gulf of California (Frontiers in Marine Science)
• CONANP 2023: Estudio Previo Justificativo, APFF Cabo San Lucas
• Mammal Diversity Database: Balaenoptera edeni
• SeaLifeBase: Balaenoptera edeni
• NOAA Fisheries: minke whale
• NOAA Fisheries: sei whale
• NOM-131-SEMARNAT-2010 (PROFEPA)
• NOM-059-SEMARNAT-2010, 2019 annex (DOF)
• Ley General de Vida Silvestre (Cámara de Diputados)
• Código Penal Federal (Cámara de Diputados)

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