OK, came home today to find one blue heron sitting in the middle of the pond ON the netting! :evil:
I then remembered I had done an article (for the November AW, due out in the next week) about pond predators so looked up what I had written 8)
It said that herons were wading birds and didn't like to get their feathers wet so the pond had to be deeper than its legs (which it is, except around the edges) or the netting had to be 15 - 30cm above the water so it couldn't spear the fish through the netting.
Hmmm, this required some thought as the pond is too big to practically build a framework over it. We finally decided we could thread nylon through the netting lengthwise then pull it up tight at each end.
So...
Grant wobbled out on the ladder and started threading nylon from the pergola to the opposite end.
He then listed the aid of mother duck
and over she goes!!!
The nylon was tied to the tree at one end and the pergola at the other.
It now looks like this
As you can see, the fish were out and about, following Grant down the ladder, obviously thinking that if he fell in all their Christmases would have come at once!
While the heron was there they all disappeared so obviously they have some sense!
I wil keep you posted as to the efficacy of our efforts.