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Ponds over the winter
I was just thinking about one or two things & was wondering what happens to
the oxygen levels in the pond over the winter if all the filtration/circulation is switched off. I know the fish go very quiet & hang out down the bottom but surely the water down there gets pretty oxygen depleted? As I understand it water is actually at its most dense at about 4 degrees C (39F) so in the height of winter its quite likely that the pond is actually warmer at the bottom than the top. If this is so then its obviously not a good idea to circulate the water out the bottom of the pond in mid winter (assuming filters use a bottom drain etc) which means the filters really do need to be turned off.... What's the general concensus - how do the fish survive in an oxygen depleted environment? I. |
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