Fish Sense

Ethologist Jonathan Balcombe presents a paradigm-shifting exploration of fish cognition, perception, and emotional lives, arguing persuasively that fish are far more sentient, intelligent, and socially complex than humans have traditionally recognized. Drawing on hundreds of scientific studies from the past two decades, he documents evidence of fish using tools, recognizing individual faces, cooperating strategically, and experiencing pain and pleasure in ways that challenge our ethical relationship with these animals. Cleaner fish maintain “client” relationships; archerfish calculate trajectory and refraction when hunting; reef fish navigate using mental maps of their territories.

Balcombe addresses the uncomfortable implications of this research for recreational fishing, commercial fishing, and aquaculture — questioning whether practices unthinkable for mammals can be justified for fish given what we now know. The writing balances scientific rigor with accessible storytelling, making complex neurobiology and behavioral research understandable to general readers. Both a work of wonder and an ethical challenge to reconsider these animals.