How can male seahorses give birth

After that, the offspring must fend for themselves. Large litters are necessary because only about 0. Many, if not all, of the 47 known seahorse species—14 of which were identified only in the 21st century—are in decline worldwide. Because seahorses generally live in shallow, near-coastal waters, human activities including development, pollution, fisheries, and traditional medicine have reduced their numbers.

It is unknown why seahorses have this sex reversal when it comes to procreation, but one idea is that having the male bear young leaves the female free to start producing the next batch of eggs. Science in Images is a new category of articles featuring photographs and videos from all the disciplines of science. Click on the button below to see the full collection. Science in Images. Andrea Thompson , an associate editor at Scientific American , covers sustainability. Already a subscriber?

The Seahorse Breeding Lab at the National Aquarium in Baltimore has raised eight species of seahorses and three species of pipefish. Populations of these fishes have been sent to institutions in the United States and Portugal.

All rights reserved. Male Contractions The male seahorse has a pouch on its stomach in which to carry babies—as many as 2, at a time. Cutting the Ties While seahorse dads go the extra mile to give birth, the parents do not provide their tiny offspring with any care or protection after they are born. Breeding Difficulties Although seahorses are the only fish that experience true male pregnancy, the males of two close relatives, sea dragons and pipefish, carry eggs attached to an area beneath their tails.

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Animals This frog mysteriously re-evolved a full set of teeth. Animals Wild Cities Wild parakeets have taken a liking to London. Animals Wild Cities Morocco has 3 million stray dogs. Creating new life takes a lot of energy, which factors into another theory as to why male seahorses carry the babies. When the females create the eggs, she uses her energy to fill the egg casings with nutrients to help the babies mature. This takes some of the stress off the dad.

He provides a safe and environmentally controlled environment for his babies, but the mom gives them some food. Depending on the species, seahorses can deliver from five to more than 1, babies at a time. Unfortunately, only about five out of every thousand survive to adulthood. The babies are so tiny that they can't eat the same plankton food as their parents, so their choices are limited.