That's fine if your population model is just an independent logistic function for each species. But ecosystems aren't like that. I'll take an example from New

That's fine if your population model is just an independent logistic function for each species. But ecosystems aren't like that. I'll take an example from New Zealand because it's where I live and what I know about. New Zealand has a huge fishery EEZ and is, I believe, widely regarded has having one of the most "well managed" fisheries in the world. And yet, in large parts of our inland waters a combination of soil runoff and bottom trawling has turned millions of acres of seabed from incredibly productive nurseries of seagrass beds and shellfish-covered rocky reefs... into featureless swathes of sediment called "Kina barrens" (basically, dominated by a kind of spiky sea-urchin). These areas have passed a tipping point, there's basically no getting them back. Shellfish can't attach to the mucky sediment to regenerate the reefs or filter the water, and seagrass is instantly eaten by the sea-urchins, which run amok because there's no nursery for the snapper population that would normally keep them in check. I don't know what my point is, really, other than to say that I think it's hubris to think we have a sophisticated enough understanding of ecosystems to balance thousands of species on the knife-edge of fishing them to maximum sustainable pressure. Sometimes we'll get it wrong and an ecosystem will go "pop". Then we can't get it back. As for positive prescriptions -- The main thing I've heard is that we should be urgently pushing for marine reserves. And that they absolutely have to be large and NO-TAKE. The goal should be something wildly optimistic like 50% of EEZs. Fishing can happen in the other half. (For reference here's where we currently are: https://www.researchgate.net/figure/Map-of-no-take-areas-and-no-take-zones-within-larger-multiple-use-marine-protected-areas_fig3_285402181 https://www.researchgate.net/figure/Map-of-no-take-areas-and... )