"The Natural Philosopher" wrote in message
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dennis@home wrote:


"Calvin Sambrook" wrote in message
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"The Natural Philosopher" wrote in message
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Any fish will suffer. A lot of ours are dead in a 1.5m pond anyway
after these frosts.


What normally does for the fish is lack of oxygen rather than cold. If
you had a solid layer of ice covering the whole surface area the oxygen
levels could easily have dropped too low. Many pond owners have a small
heater which keeps just a tiny patch clear, we have a fountain which
does the same although in the last big freeze-up it only managed to
preserve a very small patch.

The other problem can be frogs. They have a nasty habit of dying in the
cold and decomposing in the water which poisons it.


I wonder if the filter has frozen?
Plays havoc with small ponds if you don't have a good filter 24x7.
Mine hasn't frozen yet even in these cold spells.
what filetr?

This is just a hole in the ground full of water mate.

about 3x5 meters and about 2 meters deep. at its deepest.


Ah, a natural fish killer.
A lot will die every so often, some will probably survive to restock it.
A pump and a reed bed filter will work wonders.