I didn’t consider that they’d have to bring in the fish from elsewhere to feed them, that’s not sustainable at all.
Really we should be letting the free market do free market things and stop supplying as much fish, even if it does drive up prices. If you want the unsustainable fish, fine. Pay for it. Demand has to meet supply at some point.
We should not be “letting the free market” do anything.
Exploiting and killing animals will never be sustainable.
Why is that? Seems to have been sustained and even expanded for multiple millennia at this point.
Even thousands of years ago, it still involved great expense to the environment. Human arrivals on continents coincides with extinctions of megafauna
Wild hunting vs Domestication. Hunting has to be done very specifically in order to make it sustainable meaning the animals going extinct otherwise. Domestication on the other hand can be expanded as needed to feed an ever growing population.* The end problems of domestication of animals isn’t that the animals went extinct.
*Obviously other limits apply.
Tunas however cannot be domesticated, only hunted.
Tuna aren’t hunted they are fished, as are lots of other versions of sea fauna. Fishing isn’t really analogous to per-historic hunting for the simple reason that commercial fishing requires a level of sophistication that simply didn’t exist back then.
Sustainable fishing absolutely Can, and Does exist in some areas of the world today. But not for all species, and not for all nations and of course under capitalism the rewards for cheating will always threaten sustainability.But to your original point, tuna could be sustainably harvested, but enforcement is basically impossible.
In this case, fishing is very much comparable to hunting. Only we use much cruder and more destructive hunting methods underwater because we are not at home in the ecosystem.
As predators, tuna are involved in the regulation of numerous other species, migrate almost all over the world throughout the year and dive for miles depending on the time of day. Fishing them is like normalizing the hunting of tigers. Maybe even worse. After we have already wiped out some tiger species. And all for a cheap pizza topping.