I launch and make the short run to the face of the dam, where, once I stand up, I can see a huge, dark, shapeless form in the water. Tails and heads with white, sucking mouths disturb the surface. I drop my trolling motor and ease into them. Thousands of silver carp flank my boat; some passing underneath gently bump the hull. I don’t even have to aim to kill one, but I nonetheless pick out a good-size fish, anchor the fiberglass arrow, and let fly. A mass of silver explodes beside the boat as the school scatters and my fish struggles in a plume of red. A spooked carp jumps, and then another, and another. I haul my fish aboard, bash his head three times with a club, and shuck him off my arrow into a leaf tub. I reel up my slack line as fast as I can, and within 10 seconds, I’ve shot another one.