The scientific consensus on fish pain has shifted substantially; evidence from nociception, behaviour, and neurobiology increasingly supports the view that fish have pain experiences relevant to welfare.
The question of fish sentience has moved from philosophical speculation to empirical science. Multiple independent lines of evidence — nociceptor structure, pain-avoidance learning, analgesic responsiveness, and affective state indicators — converge on the conclusion that fish likely experience something morally relevant when injured. This has profound implications for commercial fishing, aquaculture, and recreational angling, where billions of fish are handled and killed each year.