Native flat oysters are being restored to European waters through aquaculture-supported restoration programmes, with welfare and biosecurity considerations alongside conservation goals.
The welfare status of flat oysters in restoration programmes faces the same scientific uncertainty as other bivalves — simple nervous systems make sentience unlikely by current understanding, but the precautionary principle supports conditions that minimise any potential stress. Bonamia ostreae infection causes tissue infiltration and mortality that represents a welfare concern if sentience is confirmed. Biosecurity measures preventing disease movement between restoration sites protect both individual health and population recovery. Restoration success creates ecosystem benefits including filtration, habitat provision and fishery support.