Immense Oil Stores Let Pacific Sleeper Sharks Float Without Imploding

Hundreds of kilograms of oil keep this giant from sinking.

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Shark liver oil was historically harvested for use in lamps and industrial applications.

The Pacific sleeper shark’s liver, which can represent a substantial fraction of body mass, contains low-density oils that provide buoyancy without gas, preventing collapse under deep-sea pressure.

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At depths where a gas-filled organ would compress dangerously, oil remains stable, allowing a shark weighing over a metric ton to maintain depth control safely.

This biochemical engineering allows one of the ocean’s largest sharks to occupy extreme habitats that exclude many large bony fishes, redefining how size and physics interact in the abyss.

Source

Smithsonian Ocean Portal

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