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I love salmon! Haven't heard much about GMO in concern with that. I've heard pros and cons about fish farming - but then, if done right that would alleviate the raping of our oceans, right?
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Well, it depends. If you farm omnivorous fish such as tilapia, carp, catfish, shellfish, etc. it is a very sustainable way of making proteins. With salmon it's a bit different since the feed comes from marine resources, more specifically fish-meal from the Chilean coast. (These are said to be the cleanest waters in the world, with a low concentration of environmental toxins.) So basically for salmon and trout you are roughly taking out 2 pounds of protein-resources and refining it to one. But salmon tastes a heck of alot better than herring!!
None of the salmon stock in Norway are genetically modified, but are in strict breeding programs. Thats' why they can grow 1 lbs of meat from 1 lbs of feed. So with fish you get the most growth per lb of feed compared to hogs, chicken, beef, etc. How is this possible you might ask? Because feed is dry and meat contains water!