I don't have an answer about this but I do have some thoughts. Farm raised fish doesn't taste anything like wild fish. The health benefits are greatly diminished. It is also frequently loaded with antibiotics so you might as well eat chicken. Particularly be aware of any fish that comes from China. Do a google search on recent news in this regard. The acception to this is domesticly farmed shellfish - which is actually aquaculture (grown in it's natural habitat).

For those who keep pointing to overfishing as the reason for the decline in the fisheries they need to wake up and face the reality that polution is the main cause. It's the pink elephant no politician will talk about. Our overbuilding of the coast and poluted run off has led to a huge decline in the number of viable fry..... less baby fish = less adult fish.
We also pump effluent out into the middle of the ocean (example Boston)fresh water + chlorine is a deadly combination for the things that live there. If it is "clean enough that you could drink it" then we should drink it...not pump it out into salinated water and screw it all up.

I have no respect for any environmental group that doesn't have the balls to include overpopulation as the root cause of our environmental woes.