It’s clearly a zero sum system. Every farmed fish consumed by humans is one less wild fish caught and taken out of the food chain.
Would you also be concerned if there were more whales in the ocean? Because they eat literal tons of phytoplankton which is also a food source for other fish. I think you’re just refusing to see things logically.
The idea that you can reduce the complexity of global fishing, farming and marine ecosystems to a zero sum system is flawed. Whales cycle nutrients when they eat phytoplankton and aren’t comparable to human activity, you’re just trying to divert the argument to something unrelated.
No they're not, read the article.
> The “food hierarchy” remains completely untouched.
I'm not sure how you've come to the conclusion that reducing the availability of food for wild fish leaves this system "untouched".