And someone once said, "This farmed salmon tastes like cardboard." To which the old fisherman replied, "That is very unfair. There are some palatable cardboards out there."
Farmed salmon doesn't have the useful amounts of omega-3s, since they don't produce actually produce them. Wild salmon eat krill, which eat algae, that are ultimately the source.
For instance if you were to buy salmon oil and the salmon was farmed raised then farmed issues aside you wouldnt be overfishing.
I believe that generic fish oil does lead to overfishing but if you by fish oil from Wild Salmon chances are they arent fishing solely for the oils.
http://www.seafoodwatch.org/cr/SeafoodWatch/web/sfw_factshee...