Scientific evidence for pain experience in fish has grown substantially. Understanding what we know and do not know has important implications for how we treat fish in fisheries, research, and the aquarium trade.
The scientific debate about fish pain has shifted substantially toward recognising that fish likely experience something functionally analogous to pain, even if the subjective experience may differ from that of mammals. Fish have the necessary neurobiological hardware for pain processing, show adaptive behavioural responses to injury, and respond to analgesics. The precautionary principle — acting to reduce potential suffering in the face of scientific uncertainty — is increasingly adopted by regulatory bodies and welfare scientists. Practical implications include improved slaughter methods for farmed fish, better anaesthesia in research and veterinary procedures, and more humane practices in recreational fishing.