Updated: Wednesday, 14 Jul 2010, 8:20 AM EDT
Published : Wednesday, 14 Jul 2010, 8:20 AM EDT
GRAND RAPIDS, Mich. (WOOD) - James Clark, a senior aquatist at Shedd Aquarium in Chicago, talks about the fish that could threaten the Great Lakes by starving out native species.
Watch the video for the interview
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