Octopuses are among the most cognitively sophisticated invertebrates, and their welfare in aquarium settings requires enrichment programs appropriate to their exceptional intelligence.
Octopus welfare in captivity is a frontier area of animal ethics, but the evidence for octopus sentience is now strong enough that their welfare deserves systematic attention. An octopus in a barren aquarium tank without enrichment is experiencing significant behavioral frustration — they are built to hunt, explore, solve problems, and learn. The short lifespan means welfare improvements cannot be deferred: an octopus kept for a year in an understimulating environment has spent most of its entire life in that state. Enrichment is not optional extra for octopus welfare — it is a fundamental requirement.