Bivalve aquaculture is often promoted as the most ethical form of animal farming, but the welfare status of oysters and mussels is more complex than commonly assumed.
The sentience question for bivalves is genuinely contested in ways that set them apart from most other farmed animals. Current evidence does not support the conclusion that oysters and mussels have subjective experiences, but the evidence base for confidence is thin. For consumers trying to minimize animal suffering, bivalves represent a genuinely ambiguous case where reasonable people applying the precautionary principle reach different conclusions. Environmental considerations strongly favor bivalves over most animal products.