I was so concerned I emailed the Wildlife Trust Wales who replied with a stockanswer, no help there I'm afraid.
In forty + years of pond keeping I have never known such a blank!.
I commented in a previous article on the frogs overwintering in bottom of my Nexus, so, I got to thinking, did the constant noise and vibration cause stress induced impotence or did it just shake the knackers off them!


Phil