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  1.                                                                                 THE WEEK, Page 20HEALTH & SCIENCEVicious Killer
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  4.     Algae, microscopic plants that live in water, sometimes give
  5. off poisons that kill fish. They hide on the bottom, detect fish
  6. overhead, then emerge to release their toxins. They also feed
  7. off fluids that come from the fish.
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