actually responding to the boat's motor. >> it gets startled by this sound and reacts by leaping out of the water. >> look at this. >> the fish frenzy is an entertaining spectacle, but there's a serious downside too. >> this species really is an invasive species. it is not native to the water. it doesn't belong here. and it does compete with the native species for food sources. >> they aggressively prey on native and sport fish, making them an angler's nightmare. they're not just in these waters. the exploding population is infiltrating tributaries across the midwest and alarmingly heading north toward the great lakes. within an hour, 21 fish have jumped onboard the boat. mac and troy aren't planning on eating them. the guys say these carp are extremely hard to prepare correctly.