Winters in most of Canada and the northern United States are usually quite long and cold, even without a Polar Vortex!. Koi and goldfish are at their most vulnerable during the winter because their metabolisms are slow and their immune systems are very weak. On top of that, the pond water quality has the greatest chance of becoming unlivable because of low oxygen levels, elevated carbon dioxide, ammonia and nitrite levels. If proper steps aren’t taken in autumn, there is a good chance that your fish won’t survive the winter. Luckily, with some extra planning, care and maintenance you can help ensure your fish thrive through the long winter months.
For more in-depth information see our How to Winterize Your Pond and How to Build a Winter Pond Cover information pages. Or if you are concerned about leaving you fish in the pond during the winter, you can always bring them inside where you can keep a close eye on them. See our Bringing Koi Indoors For Winter for more information
We have all the Fall and Winter Pond Supplies you need to prepare your pond for winter and help ensure your fish survive.