What is in some fish and shellfish that has caused the EPA and FDA to issue the restriction?
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Why is there a restriction for pregnant women and young children, but not the rest of the population?
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Do pregnant women have to avoid all fish? Explain your answer.
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What human actions lead to increased mercury levels in the environment?
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How does the mercury end up in fish? Describe flow of mercury.
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The EPA criterion for human health is 0.3 ug/g. Which fish species have average mercury concentrations that exceed the EPA limits?
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The concern level for piscivorous (fish-eating) mammals is 0.1 Hg ug/g. Which fish species have average mercury concentrations that exceed this limit? Why is the mercury level for piscivorous mammals lower than the level for human health?
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Where in the United States are mercury wet deposition levels highest? What do you think explains this pattern?
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In which samples were mercury concentrations the highest (fish, streams, or sediment)? Why do you think this is?
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What is bioaccumulation? Biomagnification? How does it apply which fish are considered more toxic to eat?
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