Oysters, clams, mussels, and scallops are farmed in vast quantities. Scientific debate about their capacity for suffering shapes their ethical status in food production.
The moral status of bivalves remains scientifically uncertain. They lack the neural architecture thought necessary for subjective experience, but they do respond to stimuli. This uncertainty is significant because bivalves are farmed by the billions and consumed with essentially no welfare consideration. If they have any capacity for suffering, the scale of potential harm is enormous. Conversely, if they lack sentience, bivalve aquaculture may offer genuinely lower-harm seafood compared to fish and crustaceans. Applying the precautionary principle while acknowledging genuine uncertainty is appropriate. Research into bivalve neuroscience deserves continued attention.