Porcupinefish Defense Response : Inflation and Spine Erection Mechanism

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In the video, A handler touches the belly of a porcupinefish (Diodontidae), triggering its natural defense mechanism. The fish rapidly inflates by swallowing water, expanding its elastic stomach to triple its normal size. This pressure automatically erects spines embedded in its skin, transforming it into a spiny ball. Inflation is an involuntary stress response to perceived threats, not a controlled action. While fascinating, this process depletes the fish's energy reserves and should not be provoked for entertainment.

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