Bivalves occupy an uncertain ethical position in animal welfare. Assessing whether they can suffer guides welfare-conscious consumer choices and production standard development.
Bivalve welfare ethics reflects the genuine philosophical challenge of making welfare decisions under moral uncertainty about sentience. The scientific consensus leans toward bivalves having negligible sentience capacity, but the uncertainty is non-zero, particularly for more complex bivalves like scallops. Under the precautionary principle, minimizing potential suffering through humane harvesting methods is prudent even with low sentience probability. The environmental sustainability case for bivalve aquaculture as a low-environmental-impact animal protein source is strong, making bivalves potentially the most welfare-positive animal protein option available when sentience uncertainty is weighted alongside environmental impact.