Carp Welfare in Aquaculture and Angling: Europe Most Farmed Fish

Common carp are the most farmed freshwater fish in Europe and a major angling target. Their welfare in both aquaculture and recreational fishing contexts has received growing scientific attention.

Key Facts

Common carp account for nearly 80% of European freshwater aquaculture production
They are among the most studied fish in welfare science, with clear evidence of pain responses
Carp show learned avoidance of hooks and areas where they have been caught previously
In angling, carp are frequently caught and released — raising welfare questions about hook injury and handling
Carp farming in ponds uses high stocking densities that cause aggression and chronic stress

Welfare Considerations

Carp welfare in angling involves hooking injury, air exposure during unhooking, handling on bank mats, and the stress of capture. Research shows elevated cortisol levels persist for hours after catch-and-release. Hook wound healing in carp is slow and infection risk is significant. In aquaculture, overcrowding causes fin damage, aggression, and disease. Welfare improvements in angling focus on barbless hooks, minimal air exposure, and using unhooking mats to protect the fish during handling.

What You Can Do

Use barbless hooks and unhooking mats when carp angling to minimise injury
Keep fish in the water as much as possible and return them quickly after capture
Support carp aquaculture producers that maintain lower stocking densities
Follow the Angling Trust welfare guidelines for catch-and-release angling