A very important and helpful list! –
Imported Catfish Why It’s Bad: Nearly 90 percent of the catfish imported to the U.S. comes from Vietnam, where use of antibiotics that are banned in the U.S. is widespread. Furthermore, the two varieties of Vietnamese catfish sold in the U.S., Swai and Basa, aren’t technically considered catfish by the federal government and therefore aren’t held to the same inspection rules that other imported catfish are.
Source: 12 Fish You Should Never Eat