Research into fish intelligence has revealed problem-solving, social learning, and tool use that challenge assumptions about their cognitive capacity — with implications for how we treat them.
Fish intelligence evidence has transformed the scientific understanding of these animals. The diversity of cognitive abilities documented — self-recognition, social learning, cross-species cooperation, tool use, and face recognition — demonstrates that fish are not simple reflex organisms but cognitively complex animals with rich behavioural repertoires. This evidence strengthens the case for fish welfare consideration that is already supported by nociception research. A species capable of cooperating with another species in coordinated hunting, or of recognising individual human faces, has neural resources that support experience beyond simple stimulus-response.