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There is nothing to physiologically prevent a shark from swimming upside down. However, it is not a common behaviour. This is because turning a shark upside down has an unusual effect.

Shark trainers will quieten a shark by turning them upside down. Upon being turned upside down, most species of shark enter a state of tonic immobility - self induced paralysis, where the shark is rendered immobile and helpless, unable to move or use any sense. This is caused by large amounts of serotonin being released into the shark's brain in order to calm it through this unusual experience, but the excess amounts act like an incredibly strong anaesthetic. Upon turning back over the shark regains its senses rapidly and continues as normal.

This is harmless to most species of shark, but in a few species, such as the great white being immobile in such a way causes respiratory problems, leading the shark to eventually suffocate if not righted.

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15y ago

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