Frilled Sharks Surface So Rarely That Most Are Seen Dead

When this shark reaches the surface, it is usually dying.

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A rare live sighting in shallow water off Japan in 2007 drew global attention precisely because it was so unusual.

Frilled sharks are almost exclusively deep-water dwellers, and surface sightings are extremely rare. Individuals that appear near the surface are often sick, injured, or caught in fishing nets, unable to survive the pressure change.

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Rapid ascent from depths exceeding 1,000 meters exposes the shark to drastic pressure reduction, potentially causing internal stress similar to decompression trauma in humans. The very act of surfacing can be lethal.

This rarity reinforces how inaccessible much of Earth’s ocean remains. Entire predator populations exist beyond routine human observation, surfacing only under catastrophic circumstances.

Source

Japan Coast Guard Report

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