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A Consumer Reports examination of the nation's supermarket seafood counters found that "although most seafood was safe to eat, there were enough exceptions to suggest that the seafood industry has considerable room for improvement -- and that the U.S. Food and Drug Administration (FDA), which oversees most seafood-safety matters, is falling short in key areas." Half of the swordfish samples tested exceeded the "action level," for methylmercury, which can harm the nervous system. The magazine advises pregnant women and young children not to eat swordfish or shark. It also found that one in eight samples of tuna had unacceptable levels of histamine, a chemical that can cause hives and other reactions.