Pistol shrimp have one normal claw, and one claw that is about half the size of their bodies. The claw stays open until a muscle causes it to snap closed, ejecting a powerful jet of water traveling at an incredible 60mph. The snapping sound itself reaches 218 decibels – your eardrum ruptures at a mere 150. The sound stuns small fish and crabs, allowing the shrimp to move in for the kill.
A bubble forms in the low pressure area behind the stream of water, which is called a cavitation bubble. As the bubble implodes, it produces a flash of light and the interior temperature reaches over 5,000 degrees Kelvin – that's close to the surface temperature of the sun!
web: http://e-fishingnews.com/interesting/1026
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