Octopus farming is technically feasible but ethically problematic given the strong evidence for octopus sentience, their solitary nature, and the absence of any welfare standards for their farming.
Farming octopuses at commercial scale would involve housing individually motivated, highly intelligent animals in conditions that cannot accommodate their behavioural needs. Isolation in small tanks prevents the exploration and novelty-seeking that drives their behaviour. Without welfare standards, commercial octopus farming would constitute a new form of intensive animal production with no welfare safeguards for highly sentient animals.