Daddy Is Pregnant Again: Why Male Seahorses Give Birth

As fascinating as the male seahorse’s role in pregnancy is, there’s even more to admire about these remarkable little fish.

Despite living in the ocean, seahorses are surprisingly poor swimmers. They propel themselves with a tiny dorsal fin that beats dozens of times each second, making them one of the slowest fish in the sea. To keep from drifting away, they often curl their prehensile tails around seagrass, coral, or other underwater plants, almost as if they’re holding on for dear life.

They also have no stomach, which means food passes through their bodies quickly. As a result, seahorses spend much of their day hunting tiny shrimp and plankton just to keep up with their energy needs. Some species can even change color to blend into their surroundings, helping them avoid predators while remaining almost invisible.

After carrying the babies in a specialized brood pouch for several weeks, the father goes through contractions before giving birth. Depending on the species, a single male can release anywhere from a few dozen to more than 1,000 tiny seahorses into the water. It’s one of the most extraordinary parenting stories in the animal kingdom.

Seahorses have also made quite a splash in popular culture. Fans of Finding Nemo and SpongeBob SquarePants have spotted these charming fish swimming through animated oceans, where their unusual appearance has made them favorites with audiences of all ages. Their horse-like heads and curled tails make them look like creatures dreamed up by an artist rather than shaped by evolution.

That connection isn’t as far-fetched as it sounds. The scientific name for the seahorse is Hippocampus, borrowed from Greek mythology. The mythical hippocampus was a magnificent creature that was half horse and half fish, said to pull the chariot of the sea god Poseidon. Long before scientists gave the seahorse its modern name, storytellers had already imagined an animal that looked remarkably similar.

Perhaps that’s why the Vancouver Aquarium’s “Daddy is Pregnant Again” campaign works so well. Seahorses are already among the ocean’s most unusual animals. Learning that the father carries and gives birth to the babies is simply the final twist in a story that sounds more like fantasy than reality.

Tony M.

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