Common carp are the most widely farmed fish species globally; their welfare in pond culture depends on stocking density, water quality, and management practices that vary widely.
Common carp welfare in aquaculture reflects the general aquaculture challenge: a species capable of surviving adverse conditions is managed in a way that exceeds its tolerance limits, causing chronic or acute stress. The physiological hardiness of carp has historically justified less attention to welfare than more sensitive species receive. But surviving adverse conditions is not the same as thriving in appropriate ones. Evidence of carp stress responses to crowding, individual recognition of human caretakers, and pain responses all suggest welfare significance that management practices should respect. Harvest practices that involve crowding and oxygen depletion deserve particular attention as a welfare improvement opportunity.