| http://www.w3.org/ns/prov#value | - d an intake of predatory fish not exceeding once a week can be recommended, Wennberg, of Ume??? University in Sweden, told Reuters Health by email.Predatory fish such as shark, swordfish, king mackerel and tilefish are at the top of the marine food chain and so concentrate mercury from the environment in their tissues.The heavy metal is known to be toxic to the nervous system, especially in fetus
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