Scientific understanding of fish sentience has advanced dramatically in recent decades. This evidence underpins the case for including fish in welfare protection frameworks and improving aquaculture standards.
The scientific case for fish sentience is now robust enough to inform welfare policy and consumer behavior. Fish demonstrate the key behavioral and neurochemical markers of pain experience: they respond to noxious stimuli, learn to avoid painful situations, show reduced pain behaviors when given analgesics, and exhibit cognitive complexity that supports the existence of subjective experience. This means that the approximately 1–2 trillion fish caught from wild fisheries and 100+ billion farmed fish slaughtered annually deserve welfare consideration. The scale of fish suffering — combined with the near-total absence of welfare protection in most jurisdictions — makes fish welfare one of the highest-priority areas for animal advocates. Evidence-based advocacy starts with accepting fish sentience as scientific consensus.