@checkervest New netting with smaller holes went in. Reaching over is now ruled out, as is poking cheeky feline limbs through. The crafty assailants then realised if they leant on the run across the long sides of the pond, the netting would give enough for them to lie on it and they could then maintain their piscinicidal misdemeanours.
Dad could not abide this, early in the morning with the dew still wet, in his dressing gown with cup of tea in hand, observing the battlefield.