Scallops are farmed in significant quantities worldwide. Their welfare status is uncertain but warrants consideration given the scale of production and emerging evidence on bivalve responses to noxious stimuli.
Like other bivalves, scallops occupy an uncertain position in welfare science. Their nervous system is more complex than oysters or mussels, and their escape responses to threats suggest more sophisticated sensory processing. Whether this translates to subjective experience of pain remains unknown. From a precautionary welfare perspective, the methods used in scallop farming — including mechanical harvesting, sorting, and alive shucking — could cause harm if scallops have any capacity for suffering. Humane slaughter methods are not currently employed because the question of sentience has not been resolved. As with other invertebrates, the appropriate response to uncertainty is to support research and apply proportionate precaution.