Seafood eaters often get cheap substitutes, but DNA tests may help
                                
                                
                                    (Newser) -
                                    The fish that shows up on American plates is often a different fish than advertised, and US seafood lovers are getting routinely ripped off as a result, the nonprofit Oceana group says in a new report. Yellowtail commonly subs for mahi-mahi, for instance, and tilapia for red snapper, notes  Consumer...