double tailed fish need warmer water. fish with lots of finnage need warmer water.
I remember Jo Ann's discussing a friend of hers that had really long tailed shubunks
in outside ponds in Washington, state of, and the fins would shred when the temp got
below 60 something.
deep bodied GF need warmer water for good digestion too. altho grazing in a pond
offsets that problem to a great degree.
I have had fancies (not really deep bodied ones) survive in outdoor ponds as long as
there was good aeration and a hole stayed open and the pond was in my greenhouse.
when the greenhouse collapsed I lost almost all the fish. I restocked and one winter
there was too much mulm and they all died. there was always attrition anyway in the
outdoor ponds.
I think it would work even better to cover the pond and drop in a 500 watt heater all
winter, like I do with my koi ... I feed them all winter long, once or twice a week
since there isnt any filter, and the water stays above 50o for all but a month at
most. they are in much better shape than going 6 months without food and their
immunity is down for a very short time, if at all.
Ingrid


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