Strangely he didn't bother with my Orfe pond. maybe he knows how fast Orfe can be. Or maybe he just didn't like the look of the bubbling water in the middle.
In any case, he went to the smaller pond and even though it's covered by a net he punched through the net and punched a hole in the head of one of my shubunkins.

I've increased the height of the net above the water and now looking online for a motion-detect-flamethrower or something like that.
actually I wouldn't mind much if he took the odd orfe now and then. They breed like.. well, like orfe and there's maybe too many in there now.