In the summer, lakes and ponds are thought of as scenes of constant activity, teeming with fish, frogs, turtles, snakes, bugs and humans. But when colder weather comes, pond dynamics change drastically and an improperly cared for body of water can become an uninhabitable environment in a very short period of time.
Fish that spend the spring and summer splashing around their playground slow down as the temperature drops. These cold-blooded animals settle into a type of hibernation known as torpor. They become lethargic and hide among the pond’s weeds. Reacting to the change in the weather, aquatic creatures stay down near the bottom of the lake or pond, where the water is warmest. Many species of frogs and turtles bury themselves in the mud at the bottom of a lake for the winter months. These amphibians alter their activities to survive the coldest time of the year, but sometimes even their instinctual behaviors are not enough. The level of oxygen and the quality of the water in winter can tip the scales out of a fish’s favor.
What is Winter Fish Kill?
“Winter fish kill” occurs when a pond is completely covered with ice and a layer of snow. The fish hunkered down at the bottom of the pond are using up the oxygen in the water, and this “winter fish kill” can happen when their supply is not replenished in time. Normally, light coming in through the ice would cause photosynthesis in the plants in the water, thus providing more oxygen for the fish. If the pond or lake is kept dark because of a wintery mixture on its surface and light cannot get through, the plants cannot oxygenate the water and the fish can die. It is conditions such as these when pond weeds fail to save the fish hiding in their undergrowth. While plants are essential for life in an icy lake, non-aquatic plants can also cause a detrimental level of muck on the bottom.
Leaves from trees and bushes around the lake fall into the water and decompose over the autumn months. Unless a pond has a leaf-catching net over it, these decaying leaves produce gases that can be toxic. If there is not a layer of ice on top of the surface of the pond, the gases will escape into the air. On the other hand, gases that are trapped under the ice can be poisonous for the creatures living below. The decomposed foliage and gases contribute to the layer of muck and the quality of the pond water at large.
How to Prevent Winter Fish Kill
Fortunately, there are ways to prevent things like “winter fish kill” and large amounts of winter muck. CLEAN-FLO’s diffused aeration systems and products such as Winter Warrior will prevent winter fish kills, establish an aerobic environment for all aquatic life while helping reduce the muck at the bottom all winter long. Winter Warrior reduces the amount of muck at the bottom of the pond or lake and improves the quality of the water in general. This muck reduction means that the fish at the bottom will be exposed to less noxious gases from the decomposition of leaves, and have a better chance at surviving the winter. By improving the water quality and reducing nutrients, Winter Warrior also has the potential to prevent overpopulation of weeds and algae in the spring. Taking action to reduce nutrients and muck in the winter puts your pond a step ahead in the spring.
Even though Winter Warrior reduces muck and increases the biological efficiency of your pond, it cannot save fish if the surface completely freezes over. An aerator can also be helpful because it keeps the pond or lake oxygenated when plants might not be getting sufficient light for photosynthesis to occur. CLEAN-FLO makes an Inversion/Oxygenation System that can provide this aeration in a very efficient package. A CLEAN-FLO system will keep an open water area in the ice all winter long so oxygen transfer can occur all winter to prevent fish kills and improve the biological activity of Winter Warrior.
Like all ecosystems, ponds and lakes go through cycles. The energy of summer is followed by a decrescendo of activity in the fall. Pond owners should not fear the coldest season. Having a clear plan of how you are going to protect your pond is crucial. Relying on products from pond experts takes some of the stress out of the process and assures an even better spring for your pond.
For more information on how you can prevent “winter fish kill” and ensure that your body of water is prepared for spring, contact us today!