Scientific evidence for pain experience in crustaceans has grown significantly, prompting several countries to extend legal welfare protections to lobsters, crabs and other invertebrates.
The welfare of crustaceans represents an emerging frontier in animal ethics and law. Unlike vertebrates whose sentience is well-established, crustacean experience is inferred from behavioural, neurological and physiological evidence. The precautionary principle — that we should act to prevent suffering where it is plausible — is increasingly being applied. Live boiling causes visible distress responses over extended periods; electrical stunning eliminates this. The scale of the issue is vast: billions of crustaceans are killed annually under conditions that would be prohibited for vertebrates in most jurisdictions. Consumer awareness and retailer welfare policies are driving gradual change, with some supermarkets now requiring humane killing methods from seafood suppliers.