As animal welfare science extends to invertebrates, questions about the capacity of aquatic invertebrates to suffer are increasingly important for ethical and regulatory decision-making.
The welfare of aquatic invertebrates represents one of the most important frontiers in animal welfare ethics. If crabs and lobsters can suffer — and the behavioral evidence suggests they may — then the billions killed annually in commercial fishing and aquaculture represent an enormous welfare concern that has been almost entirely ignored. The UK's recognition of crustaceans as sentient in law is a landmark development that carries practical implications for how they are treated commercially. The precautionary principle — erring toward welfare consideration when sentience is plausible but not proven — argues for more humane handling and slaughter methods even before definitive evidence resolves the question.