On Fla. Menus, a Favorite Fish Experiences Identity Theft: "The alleged grouper at 17 of 24 area restaurants sampled by the investigators was actually another, less desirable species, according to a DNA analysis conducted for the state attorney general's office and released earlier this month. Asian catfish. Emperor. Painted sweetlips. And twice, types of fish that could not be identified." The Washington Post's Peter Whoriskey on how and why cheaper, less popular fishes are widely and routinely substituted for desirable, expensive ones like grouper and red snapper, and how it's hard to be sure what arrives at your table is what you actually ordered.