Fish is a highly nutritious food and a much healthier choice than other meats when engaging in a healthy diet, low in fats and high in protein. The key to avoiding mercury poisoning is to choose fish which have been proved with research to be low in mercury.  The most current research on the website listed below gives a list of low mercury fish, moderate, and high contamination level fish.  It is also wise to consider moderation amounts of fish in your diet. It is recommended that we eat 2-3 servings a week that are rich in omega3 fatty oils. Serving size is important too. In any area of food consumption, there are risks involved with additives and environmental factors that could harm our health, so moderation is the key along with education on what you are eating.  Avoid mackeral, shark, swordfish, marlin, and orange roughy. Eat flounder, haddock, fresh salmon, shrimp, and scallops.