One of the fairly fatty fish being a source of high levels of a healthful type of fat is salmon. But for people who want to limit their daily fat intake there is halibut and other species which are very low in fat. One or two fish dishes a week can prevent heart disease. So even the limited consumption of the seafood should bring favor stimulation of human health. If we follow medical advice to eat several seafood meals a week we'll feel soon that it is a good way to cut our risk of heart disease. And we should start our consumption of fish earlier for save ourselves. I'd like to eat different species of fish every day, but I've heard that they can contain some quantity of mercury being sinister for human health. And an important fact is obvious: the more fat is contained in fish, the greater quantity of mercury is contained in it. Scientists advise to cook and eat five of the most commonly eaten fish that are low in fat and relatively in mercury. They recommend purchasing shrimp, canned light tuna, salmon, Pollock and catfish. How can we select safe fish or seafood? Experienced cooks buy fish and seafood only from reputable sources. They prefer to be wary of vendors selling fish out of the back of their pick-up trucks. They buy only fresh seafood that is refrigerated or properly iced. They always remember that cooked product should be separated from raw product because cross-contamination can take place. They always look for signs of frost or ice crystals instead of lays of fat if the package cover is transparent. Existence of ice crystals could mean that fish has either been stored for a long time or thawed and refrozen. Those persons who plan to get pleasure of eating fish dish have to put seafood on ice, in the refrigerator, or in the freezer, immediately after buying it.