OP is the original upload, but the agency reposted it with English subs after it got popular outside of France: https://www.youtube.com/watch?v=iLERt5ZkpQ4
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Fish don't appear to have the ability to speak or engage in social relationship with other animals in the story, so it makes sense to eat them. Like vegan find it OK eating mushrooms even though they are closer to us than they are to plants.
Mushrooms are the fruiting bodies of fungus. Complaining about eating those is akin to complaining about eating apples; you’re not harming the tree.
For example the honey bees make honey for a reason, just as apple trees make apples for a reason and maple trees make a sugary sap for a reason. "So that humans can eat it" isn't the reason in either case. The apples and maple syrup are categorised differently by vegans because the trees aren't animals. That's still an arbitrary line, but so are most things.