Last Winter, I kept track of my pond's temp, 3 acres in Orange Park, FL. Nothing formal, just threw out a pool thermometer with a sinker, float,& line to hold it two feet off the bottom, wait 5 minutes, pulled it in & read the temp. I never kept written records. I measured the temp 2-3 times a week late Dec 06 till Apr 07. My low was 60 degrees. It was not a cold winter for North FL. I suspect that there will be some winters that there will be a total die off & some not.
