Crabs, lobsters, crayfish, and other aquatic invertebrates are now recognized by many scientists and legislators as likely sentient. Their welfare in commercial fishing and food preparation is an emerging ethical concern.
Aquatic invertebrate welfare represents a frontier where science is ahead of regulation and public awareness. The probability of sentience in crabs and lobsters is now taken seriously by welfare scientists, and the suffering caused by common killing methods including boiling, splitting, and freezing without prior stunning may be substantial. The precautionary principle suggests that given the scale of crustacean consumption and the availability of rapid, humane killing methods, transitioning to stunning-first approaches is warranted. Consumer and regulatory pressure is slowly driving change.