Octopuses and squid have complex nervous systems and remarkable cognitive abilities. Their welfare in research and increasingly in aquaculture deserves serious ethical consideration.
Cephalopod welfare represents one of the most intellectually compelling cases in animal welfare science. Octopuses are so cognitively complex, so clearly individual, and so obviously curious and responsive that their welfare interests are difficult to dismiss even for those skeptical of invertebrate welfare generally. Their highly distributed nervous systems mean they can potentially experience pain in their arms independently. Their strong motivation to explore and solve problems means confinement in barren tanks causes welfare harm through behavioral deprivation as much as physical constraint. As octopus aquaculture scales up, the welfare implications of farming millions of these intelligent animals deserve urgent attention before industry practices become entrenched.