Shellfish depuration involves holding live bivalves in clean seawater to purge pathogens before sale. The welfare implications of this holding process merit consideration under precautionary frameworks.
Depuration welfare considerations focus on the conditions during the holding period. Overcrowding in depuration tanks reduces individual animal access to oxygenated water flow, potentially causing hypoxic stress in species with higher metabolic rates. Inappropriate temperature or salinity conditions during depuration cause osmoregulatory stress that may reduce survival rates. While bivalve sentience remains uncertain, precautionary welfare measures that maintain optimal water quality during depuration represent good practice regardless of the sentience question.