The FDA (see Advice about Eating Fish For Those Who Might Become or Are Pregnant or Breastfeeding and Children Ages 1 - 11 Years) recommends the following: Avoiding tilefish from the Gulf of Mexico, shark, swordfish, big-eye tuna, marlin, orange roughy, and king mackerel Limiting albacore tuna to 4 ounces (one average meal) / week Before eating fish caught in local lakes, rivers, and coastal areas, checking local advisories about the safety of such fish and, if levels of mercury are not known to be low, limiting consumption to 4 ounces / week while avoiding other seafood that week Tilefish from the Gulf of Mexico have the highest levels of mercury of all fish (as tested by the U S.Food and Drug Administration (FDA); tilefish from the Atlantic Ocean can be safely eaten.