Am seconding a call for a diary on wild caught vs. farm raised salmon. In my doctor's office, one of his journals claimed that wild caught carnivorous fish such as salmon, tend to be high in mercury. Pacific salmon have the highest concentrations because of China's coal fired factories and power plants. The same article claimed that farm raised salmon from Northern Europe had a very high PCB level because they were given North Sea feeder fish for food. The magazine suggested Chilean farmed salmon as being the safest.
I have also heard the rumor of a North American versus European trade war on salmon and am intrigued.