Sixgill Sharks Spend Daylight Hours in Deep Basins to Avoid Surface Disturbance

By day, this giant disappears into pressure and darkness.

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Diel vertical migration involves billions of marine organisms moving daily.

Sixgill sharks typically remain in deeper waters during daylight hours, ascending at night to feed. Remaining deep during the day may reduce exposure to surface predators and human activity.

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This behavioral rhythm aligns with the daily vertical migration of many prey species that rise under cover of darkness.

A predator that times its movements with planetary light cycles while living miles below illustrates how even the abyss remains synchronized with Earth’s rotation.

Source

Monterey Bay Aquarium Research Institute

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