Bluntnose Sixgill Sharks Have Litters That Can Exceed 100 Pups

One deep-sea shark can give birth to over 100 live young at once.

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Sixgill shark pups measure roughly two feet long at birth.

Female bluntnose sixgill sharks are ovoviviparous and can produce exceptionally large litters, with reports ranging from dozens to more than 100 pups in a single reproductive event. The embryos develop inside the mother, nourished by yolk sacs rather than a placenta.

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Producing such massive litters compensates for slow growth and late maturity in deep-sea environments where survival rates are uncertain. Each pup is born fully formed and capable of independent survival in dark waters.

In a habitat defined by scarcity and pressure, reproduction itself becomes extreme. A single female may release an entire school’s worth of predators into the abyss in one biological event.

Source

Florida Museum of Natural History

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