We should be fixing farmed fish. When was the last time people ate wild cow. It's not sustainable for a population to be exploiting wild fish, farm properly and learn to do it quickly. As long as we eat meat, we have to do it in the least intrusive way.
Can you cite a single type of fish that is currently farmed properly (i.e. sustainably)?
Arctic Char: http://seafood.edf.org/arctic-char
US Farmed Tilapia: http://seafood.edf.org/tilapia
US Farmed Catfish: http://seafood.edf.org/catfish
Basically, avoid any fish farmed in Asia, as there are no environmental regulations on those.