from dr. lisas website
Salmon vs fish oil: I am by no means an expert in this area but from my limited reading, it seems as if fish oil may be less contaminated than salmon oil because fish oil comes from smaller fish that are lower in the food chain and, therefore, may be lower in impurities.
Read the labels and look for the term "molecularly distilled" or "mirco-distilled".
This (salmon versus fish oil) is an area where everyone is free to do their own research and come to their own conclusions.