The scientific evidence that fish experience pain has strengthened dramatically over the past two decades. This evidence base is reshaping welfare policy and practice in fisheries, aquaculture, and research.
Fish pain science has moved from contested hypothesis to strong consensus over the past 20 years. The primary remaining scientific debate is not whether fish can experience pain but the nature and intensity of their subjective experience. From a precautionary welfare perspective, this consensus demands that fish be treated as sentient beings capable of suffering in regulatory frameworks and industry practice. The practical implications are enormous: current aquaculture and wild fisheries practices routinely cause suffering on a scale that dwarfs all other human-animal interactions combined. Mandatory stunning before slaughter, density limits, and water quality standards are the most impactful policy interventions available.