Common carp is the most farmed fish species globally by volume, yet it receives far less welfare attention than salmon. Understanding carp welfare is essential for improving the majority of aquaculture.
Carp welfare is the welfare question that covers the largest number of farmed fish individuals. Hypoxia — oxygen depletion — in earthen ponds causes acute distress and mass mortality events. Handling stress during grading and harvest is significant. Traditional slaughter methods (live chilling, asphyxiation, or live transport to markets) cause prolonged suffering. The welfare science base for carp is substantially weaker than for salmon, limiting evidence-based standard development. Given the enormous numbers involved — tens of billions of individual fish annually — even small welfare improvements per fish aggregate to enormous total welfare gains. This makes carp aquaculture welfare a high-priority research area.