. >> some of my buddies that patrol on the wabash river in vincennes, indiana, were on the river saide over here. >> mac calls troy and they set out on a fishing expedition they will never forget. >> all of a sudden, that first fish comes flying out of nowhere, passes between us, bouncing off parts of the boat. >> there's one! >> a single jumping fish is unusual, but it's not enough to shock troy or mac. but within seconds, dozens of fish start leaping out of the water in all directions. >> left side, right side, front, back, all the way across the river. they were just jumping everywhere around the boat. >> oh! there's one! up on my shoulder! >> the fish are so active that the guys have to protect their heads. and it's no picnic for the cameraman either. >> boom! >> hit the cameraman. nailed me right in the back. >> some of the fish weigh more than 20 pounds and they're propelled by powerful tails that can launch them up to six feet in the air. the fish are asian silver carp, also known as flying carp. and while their behavior looks bizarre, the jumping carp are actually responding t