I like seafood.  I do have concerns about overfishing.  Then there is the whole toxin concern.  I don’t want to have enough mercury in me to make me a human thermometer.  Nor do I want to bleed silver beads like the T-1000.   Although being a shape shifting cyborg would be kind of cool.  The good people at the Monteray Bay Aquarium have been kind enough to help to create a web page to answer most of your seafood questions.  It tells you which fish are best, good and the ones to avoid.