Winter so far this year has been “balmy” - two weekends ago it was in the 70s, we drove top down in Margarets convertible and had ice-cream 
But overnight things changed dramatically; this mornings temperature was 7f (which is -14c) - one effect is the sudden freezing over of the pond:
Different to previous years, the sudden freeze with no snow means the ice is very clear and the fish can be easily seen moving very slowly under the ice:
Close-up:
Close-up of the bubbler hole:
(as always, click any pic for much bigger)