Koi Pond Winterizing FAQ’s

Why is it important to keep an opening in the ice on a pond during the winter? Making sure you have an area free of ice is crucial for koi ponds or ponds with fish to allow proper gas exchange. A koi pond is essentially dormant during the winter months and the biological activity is at a minimum. However, this does not mean there is no biological activity. The respiration of the fish and the metabolic processes is still occur, steadily releasing waste products while using up oxygen. Without an opening in the ice, harmful gasses such as carbon dioxide remain trapped under the ice and the supply of dissolved oxygen steadily decreases. If this continues to progress and oxygen is not replenished, the fish will not survive the toxic environment and they will fall victim to what is commonly

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