Yeah, I know it sounds lame, but check out a couple of episodes of wicked tuna. Every once in a while they’ll catch one that’s 10ft long, and some of the prices they get are ridiculous...like $32/lb for a 900 lb fish, which is several middle men away from the retail price.

I am surprised that the fishing would have reached extinction levels already.

You have no idea. Our ocean ecosystems are absolutely wrecked. Go watch some videos of industrial fishing, it's disgusting. They'll straight up vacuum up entire schools of fish, use miles long nets and dredge all the way down to the ocean floor destroying everything in their path, plus of course the miles long long lines. China is especially heinous, you'll get Chinese fishing ships all over the entire fucking world, a while back there were issues with them off the Atlantic coast of Argentina (IIRC), wtf are they doing there? And of course there's the issue of by-catch, all the species they're not fishing for but which get caught and killed anyway. Seriously, the entire ocean ecosystem is facing total collapse, and at this point it really may be unrecoverable. I have no idea whether it would be a popular idea on here and of course I don't know how it would be enacted since I'm anti-globalism but I really wish we could see some kind of world wide ban on all industrial fishing for at least a decade or two, give the ecosystem a chance to at least try to recover.

Oh, and bonus: A huge amount of the plastic pollution in the ocean is from said industrial fishing. Millions of miles of fishing line and styrofoam floats and other bullshit, floating around killing marine life and degrading in the salt and sun into micro-plastics which end up in our food.

On another note, Tuna can get huge, they're an apex predator species. They don't do so well in captivity though because they are large, predatory, fast swimming fish that in nature roam over enormous stretches of ocean. It's not like tilapia or something you can grow in any mud puddle. They require open ocean.

Edit: And of course the leftist mainstream establishment doesn't, in practice, give a single shit about it. All their environmentalism is just an excuse for the transfer of wealth to the global elite and the degradation of national sovereignty. That's why they're so big on global warming, since it's this big looming ephemeral 'bad thing' they can always use to beat the people down.