Salmon slaughter methods vary widely across the aquaculture industry, from highly welfare-compromised practices to certified humane methods. Understanding slaughter welfare helps consumers and advocates drive meaningful improvement.
Slaughter is one of the most welfare-critical stages of salmon aquaculture because it represents the final experience of billions of animals annually. Live chilling - still widely used - causes prolonged conscious distress as fish experience cold shock, then suffocation. Carbon dioxide narcosis causes a painful acidification of body fluids before insensibility. Percussion stunning, when properly applied, causes rapid loss of consciousness but requires skill and consistent implementation. The welfare gap between best-practice and worst-practice slaughter methods represents the difference between seconds and many minutes of suffering for each individual fish. Given the scale of production, even small improvements in slaughter practice translate to enormous reductions in aggregate animal suffering.