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How to Maintain Proper Pond Oxygen Content


Drs. Foster & Smith Educational Staff
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How to maintain proper pond oxygen content in your pond
Oxygen plays a vital role in maintaining a healthy pond environment. Fish need oxygen to breathe and water rich with oxygen allows efficient biological filtration. A stable pond environment with clean and clear water depends on oxygen.

Is there enough oxygen in my pond?
Testing is the most accurate way to determine if there is enough oxygen in your pond. However, there are several cues that can alert you of low oxygen content in your pond. Pay attention to the following signs for early detection and timely correction of potential problems.

Fish gasping at the surface - Fish gulping near the surface, or at the entry of a water stream, or other water feature are likely oxygen starved. Pond fish such as goldfish and Koi thrive in oxygen-rich waters and are not tolerant of low oxygen levels.
Foul odors - In poorly oxygenated ponds decaying vegetation, excess fish waste, and other organic matter can emit distinct smells. A strong "lake" smell may indicate poor water circulation, filtration, or aeration.
Aggressive algae growth - A thick layer of filamentous or string algae suggests excess algal nutrients, including carbon dioxide in the water. Ponds without active aeration or gas exchange provide ideal growing conditions for nuisance algae.

Regular tests
To avoid unnecessary stress on your fish, incorporate oxygen tests as part of regular routine maintenance. In addition to the oxygen test, use the Pond Master Liquid Test Kit to measure and monitor essential pond water parameters. Since pond water parameters including pH are affected by oxygen, routine testing provides a comprehensive overview of the health of your pond.

Aerate to optimize oxygen levels in your pond
The easiest way to improve the oxygen content in a pond is to increase water movement or to add an aeration device. When water tumbles vigorously over rocky streams and waterfalls, it comes into greater contact with air. Harmful gasses are released and oxygen is incorporated into the water. Pond aeration devices such as water fountains, bubblers, and spitters break the water surface to encourage gas exchange. Air pumps like our Pond Aeration Kits inject air directly into the water to oxygenate ponds throughout the year.

Additional tips for maintaining proper oxygen levels

Remove waste - Decaying matter uses up oxygen. Use a net or vacuum to remove leaves and settled debris from the bottom of your pond. Simplify this task by skimming surface debris before it sinks.
Provide shade - Floating water plants are a fast and easy way to provide shade. Water that is cool in temperature is able to hold onto more oxygen than warm water.
Plant the right plants - Add a mixture of plants, including marginal plants, floating plants, and submerged plants to help decrease algae growth. Oxygenating plants such as anacharis and cabomba help increase oxygen level and improve water quality.
Maintain proper filtration - Clean pond filters regularly, especially before departing for vacation. A clean filter works more efficiently to provide vital water movement and waste-removing filtration.
Adjust oxygen levels to match fish population - Fish are a joy in the pond, but keep in mind, a heavily populated pond will require more oxygen. If your bio-load is high, then make sure you have enough aeration devices to maintain proper oxygen levels.
Exposed water surfaces - During the winter, it is important to keep a small portion of the pond surface from freezing. Use an aeration kit or de-icer to maintain a small opening in the ice. This opening allows gas exchange and prevents buildup of toxic gases.
Fresh, clean water - A partial water change, no more than one-third at a time, can replenish oxygen and improve water quality. Remember to use a de-chlorinator, such as Water Repair™ Neutralize for Ponds, if you have municipal tap water that contains chlorine or chloramine.
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