Octopuses are among the most cognitively sophisticated invertebrates, demonstrating tool use, problem solving, and individual personality. Their welfare in the wild and in captivity raises important ethical questions.
Octopus welfare in the wild is primarily threatened by fishing mortality and habitat degradation. Bycatch in trawls causes trauma and death; targeted octopus fishing using pots or gig fishing causes acute injury. The cognitive sophistication of octopuses — now beyond scientific dispute — means their suffering is morally significant in ways that have historically been underappreciated. A captured octopus experiencing fear, pain, or confinement is having a subjectively negative experience. Proposals to farm octopuses at commercial scale have raised welfare alarms — solitary, wide-ranging animals with complex behavioural needs are likely to suffer in the intensive, barren conditions typical of aquaculture. The combination of sentience, intelligence, and solitary lifestyle makes octopuses particularly poor candidates for intensive farming.