Chief concerns are contaminants such as mercury , cancer - causing PCBs . The risks of salmon seem to exceed the risk posed by minute PCB levels . Pregnant women should avoid high - mercury swordfish , shark , salmon , king ##fish . Some experts say pregnant women also should limit tuna consumption .
Chief concerns are contaminants such as mercury , cancer-causing PCBs . Health benefits of salmon seen to outweigh the risk posed by minute PCB levels . Pregnant women should avoid high-mercury swordfish , shark , tilefish , king mackerel . Some experts say pregnant women also should limit tuna consumption .