They will grow VERY slow through the winter in cold water. From what I read, there is just more bad than good unless you can put them out several months before the water turns cold. They grow something like 14x faster in warmer water. I would wait and avoid feeding GBH or other critters. The less time they are in there as small fish, the better their chances.
1.8 acre pond with CNBG, RES, HSB, and LMB
Trophy Hunter feeder.
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