text: Formaldehyde in Vietnamese Swai and Chinese Tilapia | Animal
  NBC-TV Charlotte, Greensboro, NC, reported unnaturally high amounts of formaldehyde in four of 15 samples of imported frozen white fish species purchased in national food retail store branches. This evidence was found by a NBC affiliated consumer reporter and a North Carolina laboratory. The Catfish Farmers of America published the following release on the issue.
  Formaldehyde-laced Vietnamese swai (a catfish-like species also known as pangasius, basa and tra) was found in three stores. Formaldehyde-tainted Chinese tilapia was also found in three stores.