Doing a bit of tidying around the pond and while sitting on the filter box noticed a fish on top of a plant basket, hidden from sight from just about everywhere behind the plants.
On investigation it turned out to be the biggest fish in the pond and last remaining from the aquarium that the pond was originally built for, sadly she is no more.
I suspect that the amorous attentions of the chaps had forced her up there; it's been a bit hectic in the pond the last few days.
The only consolation is that most of the other fish are offspring of hers and the other aquarium originals.