Bivalve molluscs including mussels and oysters are increasingly recommended as low-sentience alternatives to vertebrate meat. Current evidence suggests they likely lack the neural complexity required for pain experience.
The welfare status of bivalves is one of the more settled questions in invertebrate welfare research, though uncertainty remains. The consensus view among welfare scientists is that bivalves are very likely not sentient - they respond to stimuli but lack the neural infrastructure believed necessary for conscious pain experience. This makes them the most defensible animal protein source from a welfare perspective, particularly for people seeking to minimize suffering while maintaining animal-derived nutrition. The recommendation to replace vertebrate meat with bivalves represents a potential welfare positive even accounting for the remaining uncertainty about bivalve experience. Environmental sustainability of bivalve aquaculture additionally aligns welfare and ecological considerations.