Proposals to farm octopuses commercially have raised major welfare concerns. Evidence suggests octopuses are highly sentient beings whose complex needs cannot be met in farming conditions.
The welfare case against octopus farming is among the strongest for any proposed aquaculture species. Octopuses are now recognized by most animal welfare scientists as highly sentient beings capable of sophisticated emotional and cognitive experiences. Their complex individual needs - vast territories, complex habitat manipulation, solitary nature, need for novel challenges and sensory stimulation - are entirely incompatible with commercial farming conditions. Keeping them in groups invites cannibalism; keeping them in isolation denies their need for environmental exploration. There is no humane slaughter method currently available. The Aquatic Animal Alliance and many welfare scientists have explicitly called for a ban on octopus farming before it becomes established. This is a rare case where preventative action is possible.