In March 2004, the FDA issued an advisory cautioning pregnant women to avoid eating more than 12 ounces of fish per week, and, in particular, to avoid fish such as shark, swordfish, tilefish, and king mackerel because of high levels of mercury in those fish.
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Glad the FDA is 'protecting us' again.
http://www.neoperspectives.com/fda_tyranny.htm