Chief concerns are contaminants such as mercury , cancer - causing PCBs . The risks of salmon seem to exceed the risk posed by minute PCB levels . Minimize risk . 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 . 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 .