Sixgill Sharks Often Remain Motionless to Conserve Energy in Food-Scarce Depths

A half-ton predator can drift almost perfectly still for long periods.

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Many deep-sea species adopt energy-conserving behaviors due to limited food availability.

In deep habitats where prey encounters are unpredictable, sixgill sharks conserve energy by slow cruising or near-motionless hovering. Their large, oil-rich livers assist with maintaining neutral buoyancy.

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Minimal movement reduces caloric expenditure in environments where meals may be infrequent and widely dispersed.

A giant that can afford to wait in darkness for opportunity rather than chase it reflects the deep sea’s economics: efficiency determines survival more than speed.

Source

Monterey Bay Aquarium Research Institute

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