Some people is trying to do it since decades. Would be game-changing but is far from being solved still. The damned eight-armed tiny houdini's are too much smart for its own good.
Interesting! I wonder if it should give us pause that we're continuing to try to farm a creature that's so far proven too smart to allow us farm it successfully...
I believe the problem is that the octopuses (or cuttlefish, same problem) slowly produce less and less fertile percentage of eggs. So, first year 100%, then 50%, 20%, 5% then all sterile after five years, that sort of thing. And so far nobody really understands what we are or aren't doing, or what special nutrient, mineral, bacteria, plankton, something is or isn't present in the environment...
Yeah. Definitely not an animal to be contained but creating an environment to keep healthy populations in stock would be a leap forward.