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What shark is pregnant the longest?

spiny dogfish shark The spiny dogfish shark can be pregnant for up to 24 months—making it the longest gestation period of any vertebrate.

fisheries.noaa.gov - Five Wild Facts About Shark Reproduction | NOAA Fisheries
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In our ongoing effort to help you #KnowSharksBetter, we wanted to share some lesser-known facts about how sharks make more sharks!

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Who Runs the World?

Some female sharks are so self-sufficient they don't even need a male shark to have babies! Females from at least two different species of sharks that were separated from males have had pups without mating. Genetic testing showed that the baby sharks, also known as pups, only carried the female’s DNA. This indicates they had been conceived by asexual reproduction. When females do mate with a male, sometimes it’s more than one. Female sharks have been known to use the sperm from multiple males when they reproduce—meaning that pups in one litter could be half-siblings.

It's a Pup-Eat-Pup World

Sharks will eliminate all competition--even in the family. The largest embryo in a shark litter sometimes eats its brothers and sisters in the womb! It’s called “intrauterine cannibalism." Researchers studying sand tiger sharks noted there might be 12 in the womb but the biggest will consume the rest. This allow sharks to have 1-2 bigger babies at birth and increases the odds of survival.

104 Weeks Along

Some shark species carry their young in their womb, similar to mammals. The spiny dogfish shark can be pregnant for up to 24 months—making it the longest gestation period of any vertebrate. And you thought 9 months seemed like a long time!

135 and Counting

While the number of pups in a litter varies widely depending on the species, some sharks can give birth to huge litters. For example, the blue shark is known to give birth to as many as 135 pups in a single litter. Imagine that daycare tuition!

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Are sharks born alive or in eggs?

There are over 500 species of shark living in waters around the world and the majority give birth to live young. The remainder are oviparous, meaning they lay eggs. Around 40 to 50 different shark species live permanently in or regularly visit the waters surrounding Britain.

nhm.ac.uk - Do sharks lay eggs? | Natural History Museum

We hope you enjoyed this article…

... or that it helped you learn something new. Now we're wondering if you can help us. Every year, more people are reading our articles to learn about the challenges facing the natural world. Our future depends on nature, but we are not doing enough to protect our life support system. Pollution has caused toxic air in our cities, and farming and logging have wreaked havoc on our forests. Climate change is creating deserts and dead zones, and hunting is driving many species to the brink of extinction. This is the first time in Earth's history that a single species - humanity - has brought such disaster upon the natural world. But if we don't look after nature, nature can't look after us. We must act on scientific evidence, we must act together, and we must act now. For many, the Natural History Museum is a place that inspires learning, gives purpose and provides hope. People tell us they 'still get shivers walking through the front door', and thank us for inspiring the next generation of scientists. To reverse the damage we've done and protect the future, we need the knowledge that comes from scientific discovery. Understanding and protecting life on our planet is the greatest scientific challenge of our age. And you can help. We are a charity and we rely on your support. No matter the size, every gift to the Museum is critical to our 300 scientists' work in understanding and protecting the natural world. From as little as £2, you can help us create a future where both people and the planet thrive. Thank you.

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