We have a question that I hope can be answered. We have a large fish pond that has been established for a number of years. Over the last few days we have found a number of headless fish floating in the pond. The pond is stocked with koi, golden rud and goldfish and it appears to be the smaller fish (approx. 2-3" long) that are being killed. We cannot understand why the whole fish isn't being eaten....we have so far lost 15 fish. We have a walled garden so it would be difficult for preditors i.e turtles etc to get into the garden. Any ideas?