The Key to a Healthy Pond & Lake
We’ve all seen it — and smelled it! The unsightly algae bloom that covers your once-pristine pond is back with a vengeance. Not only does this slimy, greenish-brown substance offend the eyes and nose, but it also compromises water quality for both fish and irrigation use.
As algae grows, it accumulates closer and closer to the surface to gather sunlight. As a result, the lower depths become shaded, leaving the first few feet of water deficient in oxygen production. So, what can be done to increase oxygen levels while also eliminating unwanted growth in an eco-friendly, efficient, and effective way?
Pond aeration can reduce algae growth by circulating the water, pushing algae downward, and limiting its exposure to valuable sunlight. Higher dissolved oxygen levels also reduce the likelihood that harmful blue-green algae will take hold.
Pond aeration also helps reduce phosphorus levels. Once phosphorus is introduced into a pond, it is difficult to remove and creates an ideal environment for algae growth. Aeration promotes an oxidation reaction that binds phosphorus with iron. This compound then settles into the bottom sediment, making the phosphorus unavailable for plant and algae growth, provided adequate oxygenation is maintained.
Aeration can also help break down unwanted bacteria and reduce mosquito breeding.
Pond Aeration Benefits
How Pond and Lake Aeration Improves Water Quality
- Increases dissolved oxygen (DO) levels, one of the most important indicators of water quality and an essential element for the survival of fish and other aquatic organisms.
- Prevents stratification, reducing the accumulation of bottom sediment (muck).
- Reduces algae growth by pushing algae downward and limiting its exposure to valuable sunlight.
- Removes foul odors by reducing hydrogen sulfide gas as bottom water becomes oxygenated through pond aeration.
- Decreases mosquito activity, as mosquitoes require still water for their eggs to develop. The water movement created by a pond aerator or fountain reduces suitable breeding habitat.
How Does a Pond Absorb Oxygen?
Every pond is a unique ecosystem with its own characteristics. However, the one critical element for the health of all ponds and lakes — and life on Earth — is oxygen. Most living organisms, including aquatic species, require oxygen to survive.
In ponds and lakes, oxygen is introduced primarily through two sources: photosynthesis and diffusion from the atmosphere.
What Happens to a Pond with Low Oxygen Levels?
Oxygen levels can vary greatly from one pond to another, even on the same property. When oxygen depletion occurs, it can lead to stagnation, foul odors, algae blooms, and fish kills.
Most issues with low oxygen levels occur during the summer months because warmer water holds less oxygen while the pond ecosystem requires more as aquatic organisms grow and multiply. Nitrites, ammonia, and carbon dioxide that enter a pond or lake from lawn fertilizers and other sources can further deplete oxygen levels.
On a bright, sunny day, aquatic plants add oxygen to the pond as a byproduct of photosynthesis. After sunset, oxygen production stops, yet the plants and fish continue consuming oxygen. Often, a healthy balance between oxygen production and oxygen consumption cannot be achieved without assistance. If left unchecked, oxygen levels can drop low enough to stress or even kill fish.
Why Does Stratification Occur?
Over the course of a summer day, oxygen levels in a pond naturally fluctuate. Typically, oxygen concentrations are highest in the late afternoon and lowest just before sunrise. Most oxygen depletion problems begin in late spring and continue through October. This is a particularly stressful time for a pond because the respiration rates of aquatic life increase as the water warms, causing oxygen to be depleted more rapidly.
One of the greatest obstacles to oxygen diffusion is stratification. During the summer, the surface water absorbs heat, creating a layer of warm water that floats above a deeper layer of cooler water. Because these layers do not mix, oxygen-rich surface water cannot circulate to the bottom of the pond.
Without the circulation of oxygenated water, nutrients, sediment, and organic debris accumulate on the pond bottom, forming a layer of "muck." This buildup creates a toxic environment that promotes algae blooms, excessive weed growth, and, eventually, fish kills.
Which Pond Aeration System Is Right for Your Waterbody?
Now that you understand the benefits of pond aeration, it's time to decide which type of pond aerator or fountain is best suited to your needs. Check out our Pond Aeration or Pond Fountains page to learn more.