Mussels are bivalve molluscs farmed in large quantities worldwide. Questions about their capacity for suffering and the welfare implications of mussel farming deserve careful consideration.
The welfare status of mussels is genuinely uncertain. Unlike fish or crustaceans, bivalves lack the neural complexity most associated with conscious experience, and many welfare scientists consider their capacity for suffering to be low or absent. However, they do show nociceptive responses, and precautionary consideration is warranted given uncertainty. If mussels are capable of any form of suffering, the scale of global farming — billions of individuals — makes the stakes significant. Humane slaughter methods for bivalves are undeveloped, partly because the question of sentience has not been resolved. Supporting continued research into bivalve sentience helps ensure farming practices are evidence-based.