While Consumer Reports gives bad advice to pregnant women about tuna consumption the FDA says consumers should not fixate on mercury:

“The Consumer Reports analysis is limited in that it focuses exclusively on the mercury levels in fish without considering the known positive nutritional benefits attributed to fish,” the FDA said in a statement. “As a result, the methodology employed by Consumer Reports overestimates the negative effects and overlooks the strong body of scientific evidence published in the last decade. The statement points to an FDA survey in 2012 that found that one in five pregnant women avoided fish for long periods and that 75 percent of women ate fewer than 4 ounces a week. “Studies with pregnant women in particular have consistently found that fish is important for growth and development before birth,” the statement said.