Mercury occurs naturally in the environment and most seafood contains a small amount. Only a few species of fish may contain relatively high levels of mercury. These include dogfish, school shark, swordfish, marlin - and fish caught in geothermal waters (like trout). If you're pregnant, limit your intake to one serving of these fish every one or two weeks.
There's little concern over canned salmon and canned tuna. Canning doesn't affect the mercury content of fish, and the tuna species commonly used in cans are short-lived and so will have built up lower amounts of mercury.
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