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(Airs Sunday, July 19) Marine biologist Rick Rosenthal set out to capture on film the biggest, fastest, most dangerous gamefish in the sea -- the ancient creatures known as billfish.
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High concentrations of mercury, a neurotoxin that can damage developing brains in fetuses, are found in some kinds of popular fish such as albacore tuna.
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Wonder what it would be like to swim with billfish like Rick Rosenthal in Superfish? This field guide should give you sense of these creatures' amazing size.
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