Neighbor came over this morning. His favorite really big goldfish was dead on the bottom of their pond. On examination, Arbuckle had two puncture marks and recently a blue Heron has been visiting. Wally, my neighbor, has a fake Heron as do I. But our ponds are different. Mine has steep sides and is deep planning maybe for Koi. Wally's is shallower and has sloping sides. Without plants yet and only one table under which to hide, the fish were vulnerable. Wally constructed a 6 ft. diameter floating net to augment the table until he can put another in for hiding. I told him he might consider one of those motion activated sprayers. Anybody had any luck with those?