I have a VISION!! In the future water garden companies will start selling "Pond Chillers" for those people way down south!! I used to think that they were lucky to have such warm weather all year round, till I started reading about all the parasites and diseases that their koi and goldfish seem to always have to fight off. This is most likely due to the year round warm weather. Many many years ago, as a young teenager I too used to have goldfish in a fish tank in the house. When ever you got them from the pet store they seemed sick and diseased a lot of the time. I remember when I saw my first fish lice and was absolutely horrified! They attach themselves to the fish and I only saw this one time on a koi that the guy at the pet store had. He said that the fish come from down south where they get these types of things! I was so freak out that for years I would look very close at my fish, terrified that they would get these ugly fish lice!
So why did I never get fish lice and parasites ever since putting my fish outside back in 1991? The only thing I can think of is that the ice cold running water killed all the bad bugs that bug fish off, just like here up north. Everybody loves to ice fish here cause when you pull a big Pike out of the ice in the middle of the winter, they taste just like trout! Trout taste so good cause they only love cold lakes and steams and so people go looking for trout in the summer.
Prized Koi Keepers will someday wake up and see that my koi are always healthy and free of diseases and they will want to keep their valuable koi as clean as possible one day when they finally overcome their fear of ice cold water. I understand why many get mad about ice cold water, lots and lots of people lose their koi every winter cause they all follow each other like robots, they all turn off their pumps and worry more about the temperature of the water than the lack of oxygen under the thick ice! Then lots run air pumps and they tend to condensate and then the inside of the air tubes freeze off and there goes the oxygen!! But if you leave under water pumps and underwater big filters going all year, they should not freeze cause they are all under the water. We do get temperatures very close to minus 50 below here without the wind chill! It does not get much colder than that and my fish are outside in that and they are all very much alive and well. Running water keeps the ice thickness down in the top two ponds, and melts the ice very quick once we get back to nice warm Minus 20 temperatures...yes Minus 20 is nice and warm after getting the real bad minus 45 below where the air in your tires freeze and then the tire on your tuck looks square and the truck goes bump bump bump till it rounds back out! I can tell you that your eyelashes start to freeze together too at the temperature and that sucks! I only have one heater for all three connecting ponds, and it does not heat the water very much cause the water is still barely above freezing, it just keeps the ice at bay. (for the record my ponds are only three feet deep too!)
Hello!!! You will die first from LACK Of OXYGEN than from FREEZING to Death! and for the record, Koi and Goldfish are COLD WATER FISH, NOT Tropical, like so many koi keepers tend to treat them like tropical fish!