A pond heater! But where would one be got?
If the pond becomes completely covered with a layer of ice for any amount of time this can have serious consequences for the fish it contains. Gases are trapped in the water by the ice layer and oxygen is depleted and this drives the fish towards the surface as they attempt breathe. They can then become trapped in the thickening ice layer with fatal results. Fitting of a pond heater which can be considered a temporary installation for when the weather is particularly severe will keep a small area free of ice and allow the essential gaseous exchange. Pond heaters use only about as much power as a house light bulb and are fairly inexpensive. Link



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