I spotted the following video on one of my favorite blogs, FlowingData. I consider it a great example of storytelling with data: straightforward, no extraneous information, attention-grabbing without being overly flashy, moderate use of stats to back up key points.
Personally, I avoid farmed fish on the basis of their health profile. The video calls out other fish, but farmed salmon are also often fed grains, rendering the fish fattier yet with a lower level of healthy omega-3 fats than their wild counterparts (farming also introduces things like antibiotics and pesticides that I'd rather not consume). As the video points out, there are sustainability concerns as well.