People always ask us "how cold does the water get?" and I'm like "well, cold enough for the top to freeze!" haha!
Actually it isn’t incorrect. The only marine animals able to survive 32 degree water are in Antarctica and have blood antifreeze to avoid ice crystal formation. At 32 degrees, water loses a huge spike in energy as the crystals form and parts of the water are crystalline while some are not. These crystals puncture tissue and destroy cells. At 34 degrees there is enough of an energy cushion that the crystals cannot form. From the aquaculture community you will find that they avoid approaching freezing for this precise reason.Sorry, but that's incorrect. koi do fine down to 32F, for months at a time.
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And of course you know the temperature of your pond at depth because it’s not the same as at the surface.
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