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Foreign fish and other creatures have invaded the Great Lakes and are killing off native lake life. This investigation found most of these creatures arrived by ship from Europe or Asia and that many of these ships are not inspected as they should be before being allowed passage. Biologists believe these new species will soon dominate the lakes' ecology. Some of these changes may pose risks to humans. Most fishermen have been negatively affected. 'Flying' fish have also proved dangerous.

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