Common carp are the most farmed fish species by volume globally, with welfare considerations spanning density, water quality, handling, and slaughter practices.
Common carp aquaculture operates at enormous scale with almost no welfare regulation in major producing countries. The welfare stakes are correspondingly vast — even small improvements in slaughter method across global production would reduce suffering in hundreds of millions of animals annually. Traditional live-sale practices, where carp survive transport and are slaughtered at home by untrained individuals, represent a particular welfare concern: stunning before killing is rarely practiced and suffocation may take many minutes. Pond aquaculture of carp can allow relatively natural behaviors at lower stocking densities, but intensive recirculating and cage systems create the same crowding stress documented in salmon and tilapia farming. Research on carp cognition and pain processing has strengthened the scientific case for welfare standards applicable to cyprinid species.