Do oysters, mussels, and clams feel pain? The welfare status of bivalve molluscs is a genuine scientific and ethical frontier with significant implications for diet and aquaculture.
Bivalve welfare sits at the most uncertain edge of animal ethics. The absence of a centralised brain in oysters and mussels suggests low probability of conscious suffering, though certainty is impossible. Scallops, with more complex sensory apparatus and escape behaviour, may warrant more precautionary treatment. Bivalve farming itself raises fewer welfare concerns than most animal production, but wild harvesting - particularly scallop dredging - involves habitat destruction and mass mortality of non-target species. For those seeking to reduce animal suffering while maintaining animal products in their diet, farmed bivalves represent a relatively low-welfare-impact option.