Octopuses, squids, and cuttlefish are among the most cognitively sophisticated invertebrates. Their welfare in research and emerging aquaculture contexts is an area of active scientific attention.
Cephalopods represent a fascinating and important case study in expanding the moral circle. Their cognitive sophistication is extraordinary — octopuses in laboratory settings solve complex puzzles, recognise individual humans, and demonstrate what appear to be play-like exploratory behaviours. The welfare science suggests they can experience pain, fear, and potentially more complex negative states. The development of commercial octopus aquaculture raises significant welfare concerns: these are solitary, space-requiring animals with complex needs that intensive farming conditions are unlikely to meet. The precautionary principle applies strongly to cephalopod welfare given the evidence for their sentience.