charlie gilpin, jr. fires up his boat and heads out to fish a stretch of the iclinois river, about 100 miles west of o. he's spent most of his adult life working on the lakes and rivers of the upper midwest. >> i'm a third-generation commercial fisherman. i've been doinit for about 22, years. >> reporter: like a typical fisherman, gilpin gets an early stt. he drives while an assistant sets out the nets.'s >> now lee if we can scare 'em. >> reporter: what comes next... not so tical. >> go ahead, doug! >> reporter: this is how you catch asian carp. the loud sounds startle the fish and push them into the nets. the other unusual thing, tse fish jump. the flopping, flailing fish are an invasive species wreaking havoc on lakes and rivers across the south and miest. relpin and the other fishermen out he today are employed by the state of illinois. their mission: pull as many carp out of the river as they can. kevin irons runs the program. >> whenever any of theps are out of balance, there's too many of them, th