Common carp is the most farmed freshwater fish globally by volume, particularly in China and Central Europe, with welfare challenges in intensive production that are only beginning to receive systematic attention.
Carp welfare in aquaculture is affected by chronic overcrowding in intensive systems, the stress of mass netting during pond harvest, and slaughter methods that vary widely in humaneness. The traditional Christmas carp custom in Central Europe — purchasing live carp kept in home baths for several days before slaughter — subjects fish to days of confined stress before often being killed by methods (cutting the gill arch while conscious) that cause prolonged distress. The growing evidence for carp sentience, including learning, memory, and stress physiology, makes these practices increasingly difficult to defend ethically. Stunning before slaughter and elimination of live home storage are practical welfare improvements applicable to this culturally significant tradition.