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Message: [QUOTE="Mucky_Waters, post: 142788, member: 3859"] Thanks Charles, but my question was concerning just how cold of water they can adjust to. There seems to be no shortage of data about low oxygen levels being harmful, but when it comes to low temperature levels there doesn't seem to be much in the way of precise data out there. Obviously they will die if the water freezes around them, and everyone knows that they can survive in ponds that freezes over on the top and the water below gets near freezing, but accurate data on just how cold, and for how long are the kind of things I'm looking for. For instance, there are those that recommend not circulating pond water in the winter because the fish "koi" need the "warmer" water at the bottom of the pond. What I'm looking for is evidence to support that that couple of degrees difference really makes a difference between a healthy happy koi and one that is being stressed because it is too cold. [/QUOTE]