Mackerel

A relative of the tuna, the Atlantic mackerel is found in the Atlantic's cold waters, where it swims in large schools and can live up to an astonishing 17 years (as long as a cat!) It's a sleek, oily fish with a forked tail and contains two kinds of meat- the red outer meat and the light inner meat. Not only is mackerel high in omega-3 fatty acids, it's also low in environmental contaminants. According to the Oceans Alive website, Atlantic mackerel come from marine fisheries rather than fish farms and has relatively low "by-catch", meaning fishing for them doesn't hurt other species. Three ounces of Atlantic mackerel contain 3 grams of heart healthy monounsaturated fat and about 1 gram of omega-3, while the same amount of Pacific mackeral has 6 grams of monounsaturated fat and 1 gram of omega 3. Either way you can't go wrong. Both have a fair amount of the cancer-fighting trace mineral selenium and three ounces of either variety contain 20 grams of protein!