Bivalve molluscs including oysters, mussels, and clams are harvested and processed at scale, with welfare considerations during aerial exposure, mechanical handling, and processing.
Key Facts
Bivalves lack a centralised nervous system but possess distributed sensory ganglia
Evidence for nociception in bivalves is inconclusive but subject to ongoing research
Aerial exposure causes valve closure and physiological stress in some species
Mechanical dredge harvesting causes physical damage and injury
Processing alive without prior treatment is standard industry practice
Welfare Considerations
While the sentience status of bivalves remains scientifically uncertain, their capacity for physiological stress responses means welfare consideration is appropriate under the precautionary principle. Processing methods that minimise aerial exposure time and mechanical damage may reduce potential stress. Welfare research on bivalves is at an early stage.
What You Can Do
Support invertebrate welfare research including bivalve sentience
Donate to organisations researching marine invertebrate consciousness
Advocate for precautionary welfare frameworks in bivalve processing
Choose sustainably sourced bivalves from local producers where possible