catfish farmers in the '70s to clean their pond. >> if they were in the great lakes it would be devastating they're crowding out the native fish. this whole strip from here to peoria they call it carp ground zero. >> reporter: now a battle against time and the fish that just can't seem to be stopped. >> they spawn three times a year. they eat 40% of their body weight a day and have been known to grow beyond 100 pounds. >> reporter: to help navigate the waters, nate wallich and zach coffman. >> release the dream catcher. >> reporter: the peoria carp hunters. the duo's super hero youtube video with water skis, tubes and home made armor has catapulted them to fish-fighting fame. >> it's been an evolution, started with a football helmet. thought it would be fun to grab a sword and doing offensive things. >> reporter: now, it's time for me to join the battle. like we are going to war? >> well, it's pretty close.