What portion of lakes and reservoirs in the U.S have predator fish (like trout and bass) that exceed the EPA's human health mercury limit for four 8-ounce fish filets per month?
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During 2000-2003, the EPA conducted a survey of fish contamination levels in 500 of the 147,000 lakes and reservoirs in the continental United States. The study found that in 49% of these bodies, the predator fish exceeded the EPA's human health mercury limit. This is because mercury is passed upwards through aquatic food chains, and it tends to accumulate in creatures near the tops of the chains.
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