Damage to fish
We have a fairly large pond with many ornamental fish and a couple of carp - most of the fish are 10-15 years old. The pond is well netted against our local herons and a big golden retriever seems to deter cats from coming through the garden. This morning we were met with a scene of carnage - at least a dozen fish in various states of mutilation lying around on the grass, and fish scales all around. There is a small gap between the netting frame and the edge of the pond but I can't see how a cat could get his paw through to damage so many fish. If he caught one, the others would immediately go to the bottom of the pond as they do when the heron appears. What other creature could be responsible? I would post some pictures but I think they could be upsetting to some people. Any thoughts anyone?