Mendip
You need to eat more fish and chips if you want the fish numbers to stay low.
So when you eventually get around to admitting defeat and decide to do the hard yards and drain and clean out the pond and make a fresh start make sure you have a way of easily catch any or all the fish in your pond so then you could keep the ones you want and get rid of the others, either by eating them yourself, giving them to the gardener or feeding them to the dogs.
Maybe set up a net like David showed and leave it set permanently on the bottom until you want some fish them pull it up it should catch any fish that are there as it would cover all strata's.