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What happens to fish when they freeze in the ponds?

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Depending on where you live and how severe the winter is, ponds freeze over to varying depths. In Eastern Canada where I grew up, a typical pond freezes to a depth of about 50 cm in a severe winter or 30 cm in a milder winter. read more

Fish move down into deeper water as winter approaches, and that way they avoid freezing. The only way a fish would freeze in a pond is if the pond was very shallow, so that it froze completely to the bottom, and there were no streams or outlets through which the fish could escape before the water froze. read more

I live in NYS and I have a fish pond with koi and gold fish. During the winter we have two airation and a homemade pond heater I found on utube to make. Everything was working great until late February where we had some cold and warm days. The pond became green and four of our big Koi ( 1 -2 feet long ) I found dead just today (4/2/17). read more

When ponds and lakes freeze, it means that the average energy of the molecules decreases. At some point, the amount of heat removed is great enough so that the attractive forces between molecules can draw the molecules close together, and the liquid freezes to a solid. read more

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