With ample natural forage, bluegill will grow a little during the winter months. It's very minimal, but in ideal conditions that can gain some weight in cold water. Yellow perch are also known to be able to gain some weight in the winter. I'm also raising bluegill indoors, and they have gained weight just in the last month, however the water is averaging about 54 degrees F., which is fairly warm for around here. My main ponds are around 42 degrees F.
Holding a redear sunfish is like running with scissors.
