Disneyfication of octopuses. In that video you'll see, exactly anything that you want to see.
Would justify perfectly an: "in the video the octopus is seen trying to avoid being stolen its food by all the other fishes", that is the same behavior that you'll see if you break a crab or an urchin underwater. Many coastal fishes from rocky bottoms will come to steal any food scrap available. They don't cooperate with other fishes on any way.
Or maybe they are playing "rock, paper, tentacle", but to me the message more probable here is "this is my food, go away". If you look the video carefully the fishes seem trying to swim near the mouth of the octopus, where the probability of stealing a scrape is higher.
Would justify perfectly an: "in the video the octopus is seen trying to avoid being stolen its food by all the other fishes", that is the same behavior that you'll see if you break a crab or an urchin underwater. Many coastal fishes from rocky bottoms will come to steal any food scrap available. They don't cooperate with other fishes on any way.
Or maybe they are playing "rock, paper, tentacle", but to me the message more probable here is "this is my food, go away". If you look the video carefully the fishes seem trying to swim near the mouth of the octopus, where the probability of stealing a scrape is higher.