I live in North Dakota and for the last week or so the temperature has been
VERY cold. The night time temps have been as low as -28 degrees F for
several nights with the daytime high temps staying below minus 10 degrees
for about a week now. This is cold even for us natives.

I have a small pond, about 300 gallons, stocked with gold fish, a comet, koi
and shibunkin(sp?) and maybe a crayfish or two. The pond was nearly covered
with snow and frost that I was sure the fish would be crispy critters by now
but this afternoon I braved the cold and went out to check on them. I was
surprised and, to say the least, pleased that everyone seemed to be in as
good as spirits as possible under the circumstances. I use a 1200 watt
floating stock tank heater and a bubbler pump but I wasn't sure if the
heater could keep up with the constant cold temps. This, to me, is proof of
the hardiness of pond fish and the value of a $30 heater. My real problem
is evaporation, the cold air is very dry and the comparative warm water
makes for rapid evaporation so I'm the only guy in the neighborhood with a
garden hose stretched out in the back yard all winter.

Anyone have a similar experiences?

Frank