[Tom Ashbrook hosts a show on the growing prevalence of Asian carp, an invasive species, and threat to the Great Lakes].

Tom Ashbrook hosts a show on the growing prevalence of Asian carp, an invasive species, and threat to the Great Lakes. John Flesher, Great Lakes environmental reporter, talks about the potential impact of the carp on the Great Lakes ecosystem and the U.S. fishing industry. Dave Wethington, engineer...

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