Scientific understanding of the capacity for pain and suffering in aquatic invertebrates is rapidly evolving, with important implications for fisheries, aquaculture and research regulations.
Aquatic invertebrate welfare sits at the frontier of both welfare science and welfare policy. The growing body of evidence for crustacean sentience - from nociception research to avoidance learning to self-protective behaviour - has already driven significant policy change in the UK. The welfare implications are enormous: billions of crustaceans and cephalopods are caught, farmed and processed annually with virtually no welfare consideration. As the scientific evidence develops, the ethical and practical case for improved welfare standards in these industries strengthens. The precautionary principle argues for improving conditions even under uncertainty - the cost of inaction if these animals do suffer is far greater than the cost of preventive welfare measures.