You hear it all the time, "fish is good for you." It's heart healthy, contains essential fatty acids like Omega-3's and it's leaner than other meats. Perhaps you even imagine your meal came via a quiet little boat with a fishing rod dangling over the edge. But what's lingering at the other end of that pole is more like a giant mutant man-eating shark — toxic, nutritionally inferior and neatly packaged in deceptively clever marketing.