Longsnout seahorse  Hippocampus reidi

  Tropical reef fish

Longsnout seahorse

Longsnout seahorse Hippocampus reidi

Identity card

Longsnout seahorse

Scientific name:
Hippocampus reidi
Year of description:
Ginsburg, 1933
IUCN Status:
Near Threatened

appendix II


Warm waters of the western Atlantic Ocean, from North Carolina and Bermuda all the way to northern South America.


It lives mainly along the shore to a depth of 15 metres.


It measures about ten centimetres (about 15 cm when stretched).


This seahorse feeds on zooplankton, fish eggs and small crustaceans that it sucks in with its tiny mouth.

Longsnout seahorse Hippocampus reidi

The male longsnout seahorse incubate the eggs in its ventral pouch.


The longsnout seahorse reaches sexual maturity at about 8 months.

did you know?

Biomimicry: the joints and flexibility of the gripping tail of seahorses inspire the design of new robots or defence systems, particularly in the medical field.

Where is the animal to be found?

It lives mainly along the shore to a depth of 15 metres. It is most often found attached to gorgonians, phanerogam leaves, floating sargasso weed, sponges...

How can it be recognised?

The longsnout seahorse is characterised by its upright position and the shape of its head that is reminiscent of a horse. It uses its tail to cling to seaweed. It measures about ten centimetres (about 15 cm when stretched).

What is distinctive about it?

After a courtship ritual that resembles a ballet, the female lays her eggs in the male's ventral pouch, which he then fertilises and incubates. Depending on the water temperature, babies are born about 15 days later.

Threat and protective measure

Near-threatened species. Its trade is regulated by the Washington Convention.

Longsnout seahorse Hippocampus reidi

Where can I find it at Nausicaá?

mankind and shores

Island Stories

Tropical reef fish

The Ocean Mag

Browse through our Ocean Mag

A la une

A treaty on biodiversity in the high seas

More than 80 states gathered at the United Nations in New York have already signed the international treaty on the protection of the high seas.

banc de mérous ile de malpelo


A brief glossary of terms covering the poles and glaciers

Do you speak polar? What is the difference between pack ice and icebergs? Here are a few definitions to help you understand the cryosphere.


Poles, glaciers and climate change

A look at why glaciers and the poles are important in the fight against climate change.