Quick answer
The seahorse is a small marine fish with a horse-like head, an upright posture, and a curling, prehensile tail that grips seagrass and coral. It is one of the only animals in which the male becomes pregnant, carrying the eggs in a pouch until they hatch. Seahorses are weak swimmers that feed by ambush, and many of the roughly 46 species are threatened.
Key takeaway
The seahorse is a small marine fish with a horse-like head, an upright posture, and a curling, prehensile tail that grips seagrass and coral. It is one of the only animals in which the male becomes pregnant, carrying the eggs in a pouch until they hatch. Seahorses are weak swimmers that feed by ambush, and many of the roughly 46 species are threatened.
Overview
The seahorse is a small marine fish with a horse-like head, an upright posture, and a curling, prehensile tail that grips seagrass and coral. It is one of the only animals in which the male becomes pregnant, carrying the eggs in a pouch until they hatch. Seahorses are weak swimmers that feed by ambush, and many of the roughly 46 species are threatened.
Biology
Seahorse (Hippocampus) is classified as Fish with conservation status Vulnerable. Typical weight about 0.01 kg; lifespan around 1–5 years depending on species.
Ecology
Diet: Carnivore (tiny crustaceans). Habitat: Seagrass beds, reefs, and estuaries. Movement and social systems reflect those pressures.
People and this species
Learn before you travel or keep related pets. Wild individuals are not toys; captive care needs species-specific husbandry.
Further reading
See the full Seahorse profile for FAQs, taxonomy, and related guides on this site.
Pregnant fathers
Seahorses are famous for male pregnancy. The female deposits her eggs into a special brood pouch on the male's belly, where he fertilizes and carries them, supplying oxygen and nutrients, until he gives birth to dozens or even hundreds of tiny, fully formed young.
An unusual fish
Despite appearances, seahorses are true fish. They swim upright, propelled by a small, rapidly beating dorsal fin, and steer with tiny fins behind the eyes. With no scales, their bodies are protected by bony plates under the skin, and a prehensile tail lets them anchor to seagrass and coral against the current.
Ambush feeding
Seahorses have no stomach and no teeth, so they must eat almost constantly. They are ambush predators, anchoring in place and waiting for tiny crustaceans to drift near before sucking them up through their long, tubular snouts with a rapid snap of the head.
Conservation
Many seahorse species are threatened, with several listed as Vulnerable. They are harvested in huge numbers for traditional medicine, the curio trade, and aquariums, and they suffer from the loss of the seagrass and reef habitats they depend on. International trade in seahorses is now regulated.
Research notes
Figures for seahorses (Hippocampus) come from field studies, museum records, and conservation assessments that do not always agree on exact averages. Prefer ranges over single-point claims, and check whether a source describes wild, captive, or mixed populations.
Practical takeaways
If you encounter seahorses in the wild, prioritise distance and local guidance. If you care for related domestic or captive animals, match diet and housing to species needs rather than generic pet advice. Share accurate status information (Vulnerable) when discussing conservation.
Sources
FAQs
Seahorse: Key Facts & Natural History?
The seahorse is a small marine fish with a horse-like head, an upright posture, and a curling, prehensile tail that grips seagrass and coral. It is one of the only animals in which the male becomes pregnant, carrying the eggs in a pouch until they hatch. Seahorses are weak swimmers that feed by ambush, and many of the roughly 46 species are threatened.
What is the scientific name of the seahorse?
Hippocampus
What do seahorses eat?
Carnivore (tiny crustaceans)
Where do seahorses live?
Seagrass beds, reefs, and estuaries
Are seahorses endangered?
Listed here as Vulnerable. Check IUCN and national lists for the latest assessment.