The
Got Mercury? website includes a calculator for determining mercury levels in fish .
Species with characteristically low levels of mercury include
shrimp,
tilapia,
salmon,
Pollock, and
catfish (FDA March 2004). The FDA characterizes shrimp, catfish, Pollock, salmon, and canned light tuna as low-mercury seafood, although recent tests have indicated that up to 6 percent of canned light tuna may contain high levels
The FDA, like California, only warns women of child bearing age to avoid fish with the highest levels of mercury; they include: shark, swordfish, king mackerel and tilefish
http://www.fda.gov/oc/opacom/mehgadvisory1208.html.Many consumers are not aware, for example, that a 115 pound women consuming just two cans of albacore tuna in a week puts her 310% above what the EPA and FDA considers safe; a child weighing 45 pounds eating just one can of albacore tuna per week would get a dose 420% higher than the EPA/FDA's safe limit of .1 microgram/kilogram-day of mercury exposure. The same person consuming swordfish would have mercury level of more than three times that high.
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