Manila clams are farmed extensively in coastal Europe, with welfare considerations part of the growing attention to bivalve sentience.
Clam welfare exists at the frontier of current animal welfare science - bivalve molluscs have distributed nervous systems without centralised brains, and evidence for sentience is preliminary. The precautionary approach increasingly applied to invertebrate welfare suggests that minimising unnecessary stress during farming and harvest is appropriate even without definitive evidence of subjective experience. Mechanical harvesting by dredging causes physical disturbance, shell damage, and abrupt environmental change that would constitute stressors for any animal. Developing harvest methods that minimise physical damage and environmental shock aligns precautionary welfare considerations with product quality objectives, as undamaged, less-stressed clams have better shelf life.