Mussel and oyster farming has a low environmental footprint, but growing evidence about bivalve sentience raises welfare questions that deserve careful consideration.
The moral status of bivalves is genuinely uncertain, and welfare decisions under uncertainty should reflect that uncertainty. Current evidence does not compellingly establish that mussels or oysters are sentient, but it does not definitively rule it out either. A precautionary approach suggests considering more humane slaughter methods (rapid chilling or electrical stunning before processing) where feasible, while acknowledging that bivalve farming has significant environmental advantages over most other animal protein sources. As the science develops, welfare standards should be revisited.