Juvenile Pacific Sleeper Sharks Begin Life in the Same Crushing Depths as Adults

Even newborns face pressure that would shatter human lungs.

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Many deep-sea sharks are ovoviviparous, meaning embryos develop inside eggs retained within the mother.

Pacific sleeper sharks are believed to give birth to live young that immediately inhabit cold, deep environments similar to adults, exposing juveniles to extreme pressure from the start.

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Instead of developing in shallow nursery grounds like many coastal sharks, these young must cope with near-freezing water and immense hydrostatic force as soon as they enter the ocean.

Beginning life in such hostile conditions underscores how fully adapted this species is to the abyss, where survival depends on traits tuned to darkness, cold, and crushing weight from birth.

Source

Alaska Department of Fish and Game

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