The following text is an excerpt from, Raising Baby Green, by Dr. Alan Greene.

Shrimp and prawns account for 31 percent of all seafood sales. Although shrimp is low in mercury, it is often not sustainably harvested or raised. In fact, shrimp trawling can be one of the most harmful fishing practices, due to high by-catch (meaning that other species are killed inadvertently along with the shrimp harvest). Shrimp aquaculture can also destroy coastal wetlands and mangrove forests. The often indiscriminate use, or misuse, of antibiotics, pesticides, and other water and shrimp feed additives is another reason to avoid most farmed shrimp. If you want shrimp, northern shrimp, Oregon shrimp, and spot prawns may be your best bets. Or you might also enjoy bay scallops or farmed scallops.

Tuna too should move to your "avoid" list. Despite FDA recommendation that women can safely eat up to six ounces of albacore (white) tuna, weekly,¹ an EPA analysis shows that if women follow this advice, more than 90 percent of all women (and their babies) would be exposed to mercury above the government's safe dose at least once during the pregnancy².