Asian carp invasive in North American waterways cause ecological devastation and are subject to extensive removal programs, raising welfare questions about fish sentience and humane killing.
Asian carp in North American rivers cause severe ecological harm by outcompeting native fish and filter-feeding organisms. Removal programs using electrofishing, nets, and targeted harvesting are ecologically necessary but raise welfare questions about the fish themselves. Electrofishing stuns fish but does not kill them immediately, and stunned fish may revive in unsuitable conditions. Net harvesting causes crowding stress and suffocation during sorting. As fish with nociceptors and demonstrated pain responses, carp likely experience suffering during removal operations. Commercial processing that stuns before killing represents a welfare improvement over suffocation. The scale of required removal means even small per-fish welfare improvements would have significant cumulative effects.