The question of whether fish feel pain was once contested, but scientific consensus has shifted significantly. Fish possess the neurological hardware for nociception and exhibit behavioural responses consistent with pain experience.
Evidence from preference tests, analgesic studies, and neurological research indicates fish experience something akin to pain. Fishing practices including hooking, air exposure, and rapid pressure changes during catch-and-release cause measurable physiological stress. Aquaculture practices such as crowding, live chilling, and asphyxiation are increasingly subject to welfare scrutiny. The precautionary principle strongly supports improving fish treatment.