Octopuses are among the most cognitively sophisticated invertebrates and their welfare in laboratory settings is gaining increasing scientific and regulatory attention.
Octopus welfare represents the leading edge of expanding moral circles in laboratory animal protection. Their cognitive sophistication is well-established, and their capacity for pain and distress is supported by behavioral and neurophysiological evidence. Laboratory housing often fails to meet their environmental needs: bare tanks without dens or enrichment cause chronic stress visible in skin pattern changes and activity levels. The natural solitary lifestyle of most species means social housing is not a welfare solution as it is for rodents. Instead, environmental complexity — hiding places, objects to manipulate, varied substrates, and opportunities for exploration — is the primary enrichment strategy. The extension of regulatory protections to cephalopods reflects scientific consensus that their welfare deserves serious consideration.