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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.

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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.

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