We only have a house hand held zapper but the catch goes in the tank as feed. If I had one over a pond I would remove the bottom plate and just let them fall into the water. Many people I know that live on lakes have moved their zappers away from the house and out over the water When the fish hear the zap they hear a dinner bell. Unless the amount of dead bugs in in the pounds I would just consider it a treat. We also net sewing needles for our larger fish and they eat them up also.