Cuttlefish are among the most cognitively sophisticated invertebrates — their welfare in aquaculture and research settings raises important ethical questions.
Cuttlefish welfare deserves serious attention given their exceptional cognitive abilities. They have the most complex nervous system of any invertebrate — large, well-developed brains with neurons numbering in the hundreds of millions. Cuttlefish show individual personality, play behavior, and episodic-like memory. In research settings, they are subject to procedures that would require ethical review if performed on vertebrates, yet historically received minimal protection. Aquaculture stressors include crowding that prevents territorial behavior, inadequate environmental complexity for animals that use elaborate camouflage as primary communication, and slaughter without stunning. The UK's recognition of cephalopod sentience has begun to change regulatory frameworks. Best practice in cuttlefish husbandry involves complex environments, visual barriers for territorial management, and enrichment that engages their remarkable sensory-motor abilities.