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Seahorse Facts

10 Facts About Seahorses

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Author and marine biologist Helen Scales, Ph.D., said of seahorses in her book Poseidon's Steed: "They remind us that we rely on the seas not only to fill our dinner plates but also to feed our imaginations." Here you can learn more about seahorses - where they live, what they eat and how they reproduce.

1. Seahorses are fish.

After much debate over the years, scientists finally decided that seahorses are fish. They breathe using gills, have a swim bladder to control their buoyancy, and are classified in the Class Actinopterygii, the bony fish, which also includes larger fish such as cod and tuna. Seahorses have interlocking plates on the outside of their body, and this covers a spine made of bone. While they have no tail fins, they have 4 other fins - one at the base of the tail, one under the belly and one behind each cheek.

2. Seahorses are bad swimmers.

Although they are fish, seahorses are not great swimmers. In fact, they Seahorses prefer to rest in one area, sometimes holding on to the same coral or seaweed for days. They beat their fins very quickly, up to 50 times a second, but they do not move quickly.  They are very manueverable, however - and able to move up, down, forward or backward.

3. Seahorses live around the world.

Seahorses are found in temperate and tropical waters throughout the world. Favorite seahorse habitats are coral reefs, seagrasses, and mangrove forests. Seahorses use their prehensile tail to hang out on objects such as seaweed and branching corals. Despite their tendency to live in fairly shallow waters, seahorses are difficult to see in the wild - they are very still and blend in very well with their surroundings.

4. There are 53 species of seahorses.

According to the World Register of Marine Species, there are 53 species of seahorses. They range in size from under 1 inch, to 14 inches long. They are categorized in the Family Syngnathidae, which includes pipefish and seadragons.

5. Seahorses eat nearly constantly.

Seahorses feed on plankton and small crustaceans. They do not have a stomach, so food passes through their bodies very quickly, and they need to eat nearly constantly.

6. Many seahorses mate for life.

Many seahorses are monogamous, meaning they mate for life. The male and female have an elaborate, daily courtship ritual, involving a "dance" where they entwine their tails, and may change colors.

7. Male seahorses give birth.

Unlike any other species, the males become pregnant.  Females insert her eggs through an oviduct into the male's brood pouch. The male wiggles to get the eggs into position. Once all the eggs are inserted, the male goes to a nearby coral or seaweed and grabs on with his tail to wait out gestation, which may last several weeks.  When it's time to give birth, he'll contort his body in contractions, until the young are born, sometimes over a period of minutes or hours.  Baby seahorses look just like miniature versions of their parents.

8. Seahorses are experts at camouflage.

Some seahorses, like the common pygmy seahorse, have a shape, size and color that allows them to blend in perfectly with their coral habitat. Others, such as the thorny seahorse, change color to blend in with their surroundings.

9. Humans use seahorses in many ways.

In her book Poseidon's Steed, Dr. Helen Scales discusses our relationship with seahorses. They have been used in art for centuries, and are still used in Asian traditional medicine. They are also kept in aquariums, although more aquarists are getting their seahorses from "seahorse ranches" now rather than from the wild.

10. Seahorses are vulnerable to extinction.

Seahorses are threatened by harvesting (for use in aquariums or Asian medicine), habitat destruction, and pollution. Because they are hard to find in the wild, population sizes may not be well-known for many species.  Some ways you can help seahorses are not purchasing souvenir seahorses, not using seahorses in your aquarium, support seahorse conservation programs, and avoid polluting water by not using chemicals on your lawn and by using eco-friendly household cleaners.

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