How are crabs killed?

Chef's answer
The only method of stunning/killing crabs and lobsters that can produce an immediate loss of consciousness (within 1 second) is electrical stunning, enabling them to be killed without pain..
Frequently asked Questions 🎓
Put a plug into the clam to keep it open. Like the grafting process, extracting the pearl without killing the oyster requires putting in a plug to hold the shell apart. Cut the oyster and use tweezers to remove the pearl. Remove the plug and allow the oyster time to recover before grafting with the oyster again.
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