These are not an edible species of octopus, they live at a depth of over 3000 metres, five times deeper than any trawler can reach, and they're small - species in that genus are typically ~10 cm across, so all 1000 of them would make about a tonne, worth <$10k if they somehow became edible. I don't think they're in much danger of being eaten by humans.

So a massive nursery of octopus, not a nursery of massive octopus.

P.S. I feel the plural of octopus should be neither octopi nor octopuses, but either: octopus - same as singular, you know, like 'sheep'; octopussies - for fun, because they're not as cute as cats.

Isn't the plural octopodes?

from the video they definitely look larger than 4 inches in diameter..

CORRECTED: Is the length of the mantle. The round inflatable part close to the head. Tentacles and 'head' sensu-stricto are excluded.

Cephalopods will change a lot its length when tentacles are retracted (dead animal) or relaxed (alive), so 'mantle lenght' is used instead as a sort of equivalent to body length. Is a much less variable measure.

An Octopus Farm would certainly be an interesting concept.

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.

It's pretty common in Wild Kratts.