That Ain't Grouper on Your Plate:

The Washington Post reports that the fish you order is not always the fish you get. Investigators ordered grouper at 24 Florida restaurants, but genetic testing revealed it was only the real thing seven times. Accoding to the story, the high demand for grouper and other popular fish has caused a surge in seafood imports, and that much imported fish is not what the sellers claim. In most cases it was Emperor fish or Asian Catfish. There is good news, however. Major food distributors, such as Sysco, have begun random testing of their fish supplies to ensure authenticity, and this appears to be reducing the rate of fish fraud.