If you are going to eat fish, I would advise to consult a guide on which fish to eat and wish fish to avoid based on environmental factors and health safety factors:
http://www.montereybayaquarium.org/c...endations.aspx
For example, for Salmon, the guide says to avoid Farmed salmon, Atlantic Salmon and Sake. It'll also give you reasons behind their recommendations.
Best choices would be alaska wild-caught coho, sockeye, king, pink, red and sake (alaska).