Pacific seahorse in Los Cabos

How to recognize it

Unmistakable: a horse-like head held at about a right angle to the body, a long tube snout, and a curling, grasping tail with no tail fin. On top of the head is a moderately high crown (coronet) with five points, and there are prominent spines over the eye and on the cheek. The body is made of bony rings, usually with well-developed knobs that fade in big males. Males have a slight keel on the chest and a brood pouch on the belly. Color changes with the surroundings: red, yellow, tan, brown, gray, black or green, often with small blackish and white spots or pale crossbands and lines.

Biology

The Pacific seahorse lives only in the eastern Pacific, from southern California through the Gulf of California to Peru and Chile, including the Galápagos, Cocos and Malpelo islands. It lives in weed beds, among sea whips and gorgonians and on rocky reefs, from about 1 to 107 m, usually in shallow water. It has been photographed at Cabo San Lucas and recorded at Cabo Pulmo, but it is rare and easy to miss: Reef Life Survey divers find it at only about 4% of the sites they survey in its range.

It is mostly active at night and eats small bottom-dwelling animals such as tiny shrimp and plankton, sucked in through its snout. The female lays her eggs in the male's brood pouch, and he carries them for about 14 to 15 days, depending on water temperature, before giving birth. It also drifts with floating debris: it has been collected at the surface and found in the stomachs of tunas.

Seeing them from the boat

The Pacific seahorse is a fish for divers and snorkelers to find, not a fishing species. Around Los Cabos look for it wrapped around sea fans, sea whips, weed or rope on rocky reefs; it stays still and changes color to match, so it is easy to swim past. Look closely, don't touch, and don't move it for a photo.

It is protected in Mexico. Catching, keeping, transporting or selling one without federal authorization is a crime. If one ever comes up tangled in a line or on an anchor, put it straight back in the water. Do not buy dried seahorses as souvenirs: export needs CITES permits. Sport fishing is not allowed inside Cabo Pulmo National Park.

Rules & conservation

Protected in Mexico. Look, don't touch, and never take one.

Don't confuse it with

It is the only seahorse found along this coast, so any seahorse you see in Los Cabos is this species. Its closest look-alikes are pipefishes, such as the bluestripe pipefish (Doryrhamphus melanopleura): they are relatives with the same tube snout, but their bodies are straight and they have a small fan-shaped tail fin instead of a curling tail.

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: Hippocampus ingens
• FishBase: Hippocampus ingens
• Reef Life Survey: Hippocampus ingens
• Florent's Guide to the Eastern Pacific Reefs: Pacific seahorse (Cabo San Lucas)
• Villarreal-Cavazos et al. 2000, fishes of Cabo Pulmo reef (Rev. Biol. Trop.)
• The ETYFish Project: Syngnathidae
• iSeahorse: IUCN Red List assessment summary for Hippocampus ingens
• CITES Notification 2004/033: trade in seahorses
• Mongabay Latam 2021: seahorse trafficking from Mexico to China
• NOM-059-SEMARNAT-2010, 2019 annex (DOF)
• Ley General de Vida Silvestre (Cámara de Diputados)
• Código Penal Federal (Cámara de Diputados)
• Smithsonian Shorefishes of the Eastern Pacific: bluestripe pipefish

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