Updated COT Statement on a Survey of Mercury in Fish and Shellfish
Summary:
The British government studied mercury levels in fish and shellfish – and the impact of this mercury exposure on British consumers.
British government scientists believe that eating two 140g portions of fresh tuna - or four 140g portions of canned tuna - each week before or during pregnancy is not be expected to cause any bad effect(s) on the unborn child.
These British government scientists also note that the methylmercury content of fresh tuna is lower than that of shark, swordfish, or marlin - but higher than that of other commonly eaten fish in Britain.