"On a recent afternoon, Gregg Houghaboom pointed to a photo of a fish fillet and asked a room full of ocean experts to identify it. They couldn't. Absent a head, tail and scales, it looked like a hunk of grouper -- but it was actually Lake Victoria perch.
Houghaboom's point was simple: It's hard to uncover seafood fraud, even when you're looking for it. The perch was sold to grocery stores and restaurants as grouper, for a premium price, until Houghaboom, a special agent at the National Oceanic and Atmospheric Administration, helped expose the fraud."