Farmed Scallop Welfare: Evidence and Dredging Impacts

Scallop dredging causes physical trauma and mortality in wild populations. Farmed scallop aquaculture raises different but significant welfare questions for this mollusc species.

Key Facts

UK scallop fisheries are worth approximately 60 million pounds annually
Dredging destroys benthic habitat and non-target species across wide seabed areas
Scallops show escape responses to predators and may have some nociceptive capacity
Farmed scallops are suspended in long-lines or sea cages at much higher densities than wild populations
Mortality during farming from disease and environmental stress is a welfare concern
The sentience of scallops is contested but precautionary welfare consideration is increasingly argued

Welfare Considerations

Scallop welfare sits at the boundary of welfare consideration. Their nervous system is simpler than decapod crustaceans but more complex than bivalves like oysters. They show startle responses and directed escape behaviour suggesting some nociceptive capacity. Dredging trauma causes physical damage - broken shells and torn tissues - that would be recognised as harm in sentient animals. Precautionary welfare standards and shift toward aquaculture methods causing less physical trauma are appropriate responses to current uncertainty.

What You Can Do

Choose farmed rather than dredge-caught scallops when available
Support campaigns for seabed protection from destructive scallop dredging
Advocate for scallop welfare to be reviewed as part of invertebrate welfare research priorities