Crustaceans including crabs, lobsters, and shrimp are increasingly recognized as sentient animals capable of experiencing pain and distress. This recognition is transforming welfare standards and practices in fisheries and aquaculture.
Aquatic invertebrate welfare represents the frontier of animal welfare science and policy. The evidence for crustacean sentience has accumulated rapidly: these animals have nociceptors, produce endogenous opioid compounds, show protective behaviors toward injured areas, and demonstrate avoidance learning in ways consistent with pain experience. The policy implications are significant: if crabs and lobsters can suffer, then live boiling — the dominant commercial and domestic slaughter method — causes substantial suffering during the time to unconsciousness. Shrimp farming, producing the most animals of any aquaculture sector, has operated with essentially no welfare framework. The transition from treating crustaceans as non-sentient to applying appropriate welfare standards requires changes in commercial handling, holding, and slaughter practices that the industry is only beginning to address.