Millions of Asian carp are wreaking havoc in the Mississippi River. They were originally imported by fish farmers, who used them to eat algae in their fish ponds. But some of the fish managed to escape into the Mississippi, where they reproduced rapidly...
More Information:
http://www.dw-world.de/dw/0,,9103,00.html
http://www.dw-world.de/dw/0,,11487,00.html
http://www.dw-world.de/dw/episode/0,,15630062,00.html