Why It's Bad: Imported shrimp actually holds the designation of being the dirtiest of all the seafood we looked at. (For our full list, check out 12 Fish You Should Never Eat.) Problem is, 90 percent of shrimp sold in the U.S. is imported. Imported farmed shrimp comes with a whole bevy of contaminants including antibiotics, residues from chemicals used to clean pens, E. coli, mouse hair, rat hair, and pieces of insects. Yum! Part of this has to do with the fact that less than 2 percent of all imported seafood (shrimp, crab, catfish, or others) gets inspected before its sold, which is why it's that much more important to buy domestic seafood.
Eat This Instead: Domestic shrimp. Seventy percent of domestic shrimp comes from the Gulf of Mexico, which relies heavily on shrimp for economic reasons. Pink shrimp from Oregon are another good choice; the fisheries there are certified under the stringent Marine Stewardship Council guidelines.