The wind

[klondike]

Sorry photo won't upload

Probably too big. Most phone and camera pics are huge for no good reason

https://letschat.club/index.php?topic=13.0

[JBR]

May I suggest a simple solution JB?

Get a pond thermometer.  They're not expensive.

https://www.amazon.co.uk/pond-thermometer/s?k=pond+thermometer

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Another link for you if you were interested.  It's about winter  feeding of pond fish:

https://www.pond-planet.co.uk/blogs/blog/pond-winter-care-when-to-stop-feeding-pond-fish-for-winter?srsltid=AYCX9vJlDNcR-skIVNMhMnfw6g9s9ulW9OM_OWaQMvn8d6XUqiRV5ict

Thanks for this Mups.
I have stopped feeding the fish as the temperature outside is down to 10 degrees.  However, I keep the fountain and pump going right through the winter, as I think that it does filter the water and also prevents the surface freezing solid.
I don't know if I mentioned earlier, but I have had ten adult fish, though a couple have died over the past few months.  In return, though, there are now at least ten babies who seem to be doing well.