Blue mussel culture on rafts and longlines is one of the most environmentally benign forms of aquaculture, but welfare questions about sentience and handling practices during harvest are increasingly being considered.
The welfare significance of bivalve molluscs including blue mussels is scientifically uncertain. They lack centralised nervous systems capable of integrating pain experiences in a way analogous to vertebrates. However, they do respond to physical stimuli and can attempt to close their shells in response to potential threats. The precautionary approach suggests that handling practices that minimise physical damage are appropriate even given this uncertainty. Longline and raft culture avoids the dredging damage inflicted on wild mussels, suggesting relatively benign production from a welfare perspective under current scientific understanding.