Many Frilled Sharks Are Discovered Only After Rapid Decompression

Bringing this shark upward can trigger fatal pressure shock.

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Most surface sightings involve specimens that survive only briefly after capture.

When frilled sharks are caught and rapidly brought to the surface, the sudden drop in pressure can cause severe physiological stress. Adapted to high-pressure environments, their bodies are not optimized for abrupt decompression.

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The transition from 100 atmospheres to 1 atmosphere represents a dramatic environmental shift. Tissues and internal systems accustomed to compression experience destabilizing expansion.

This vulnerability explains why most surface appearances involve weakened individuals. It also illustrates how specialized deep-sea adaptations can become liabilities outside their native pressure regime.

Source

Japan Coast Guard Report

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