"Elaine T" wrote in message
om...
George wrote:
"Reel McKoi" wrote in message
...

"ba5416" wrote in message
...

The ice came off the pond a week or so ago. Found several fish floating
on
the surface and several on the bottom. Pond is about a 1000 ga, 4ft
deep

at

the deep end. Pond has been in place for 4 years now with no problems.
I
leave the pump running 24/7/365, turn the fountain off and leave the
waterfall run to keep things open.
Did the water quality tests once I found the dead fish. Everything was

OK.

$ You didn't allow the fish to find the "warm spots" at the bottom of
the
pond and rest for the winter. The current and cold probably killed
them.
Just about everyone in a cold climate turns the waterfalls etc off to
allow
this natural rest period - and so that the water can do it's natural
conversion (cold at the top, warmer and still at the bottom.)


I see that you flunked thermodynamics. Cold water sinks. Warm water
rises.


I see you fluked chemistry. ;-) Water is at its absolute highest
density at 4 degrees C, above freezing. Because of this, interesting
thermal stratifications can occur in cold, still water.
==================
Thank you Elaine. When the water goes through this conversion in the fall
the fish remain almost unmoving in the still water at the pond bottom. A
current of colder water at this time is not good for them.
--
McKoi.... the frugal ponder...
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