In the maritimes when the cod collapsed they blamed seals.
They also disagree with you that they've never been sustainably fished.
So the "new sustainability" under climate change has to be much more precautionary than before, and yet not shut down on false signals. It's tricky science even when intentions are good.
Oh shit, something I know about!
https://www.youtube.com/watch?v=1DqH2DPSw4g
Yea, people have actually done this sustainably.
>Farmed seafood, in general, is a sustainable option, requiring far less feed per pound compared to other farmed sources of protein like beef, pork, and chicken.
That is one advantage if true but that just means more sustainable than beef, pork, and chicken.
Is there a condition that would prevent their farming? Like the accessibility of the feed?
So I guess they harvest wild fish to feed the farmed fish?
It's a complicated subject but the simplest answer goes back to the circle of life. There are two survival strategies of a species. Either becoming a predator, or become very useful prey. Which, in crass terms, basically means that if humans don't buy it (don't eat it, therefore don't insure it's survival), it will die out (e.g. it's "worthless") if it cannot evolve into a predator species.