Crabs are increasingly recognised as animals capable of experiencing pain. Live boiling — the standard killing method — is likely aversive and warrants replacement with more humane alternatives.
The evidence for crab sentience has crossed the threshold warranting precautionary welfare action. The experience of a crab dropped into boiling water — if it can experience anything at all — involves acute nociceptor activation across the body surface for a period too long to dismiss as trivially brief. Equally, transport and holding conditions for live crabs in commercial supply chains subject animals to cold stress, physical damage, and confinement without food or water. The availability of electrical stunning devices means the welfare case for improving crab slaughter is not merely theoretical — the alternative exists. The barrier is cost, habit, and the near-complete absence of regulatory requirements for crustacean welfare in most jurisdictions.