In regards to most commercial fisheries, species loss is a separate issue from pollution. In any event species loss is rectified through sustainable fisheries practices.
Extensive aquaculture is the simplest and oldest of the three commercial applications. It is low yield and low maintenance, but area intensive. Also ecologically damaging, but that's also a separate issue from pollution. Which extensive-type aquaculture contributes little.
There's protein that's efficient to produce, and then there's protein that people will choose to eat. Pollution can be ameliorated with modern science and technology, given the economic and political resources to make use of them. Conversely, if someone can make soybeans taste like prime rib or bluefin tuna, much of the resource extraction pollution can be prevented in the first place.
Extensive aquaculture is the simplest and oldest of the three commercial applications. It is low yield and low maintenance, but area intensive. Also ecologically damaging, but that's also a separate issue from pollution. Which extensive-type aquaculture contributes little.
There's protein that's efficient to produce, and then there's protein that people will choose to eat. Pollution can be ameliorated with modern science and technology, given the economic and political resources to make use of them. Conversely, if someone can make soybeans taste like prime rib or bluefin tuna, much of the resource extraction pollution can be prevented in the first place.