Pre-slaughter handling and stunning in salmon aquaculture is a critical welfare point affecting millions of fish. The shift toward welfare-positive harvesting methods represents significant progress in aquatic animal welfare.
The harvesting and slaughter of salmon without effective stunning represents one of the largest-scale welfare failures in any food system. Millions of fish annually experience the physiological stress of crowding, pump transfer, and live chilling — all while conscious and fully capable of experiencing the distress these procedures cause. The transition to pre-slaughter stunning eliminates this welfare cost at the point of highest individual vulnerability in the salmon life cycle. Percussion stunning is now technically feasible at commercial scale and is being adopted by welfare-progressive producers. The welfare benefit — instantaneous loss of consciousness replacing prolonged stress and temperature-mediated death — represents one of the largest per-animal welfare improvements achievable in aquaculture.