Which aquatic plants give oxygen 24 hours a day

Oxygen in the pond

Does the pond need oxygen and how important is oxygen in the (Koi) pond? The oxygen content in the pond is extremely important for the quality of life in the garden pond. Life is impossible without oxygen - neither in nor out of the water. The oxygen content of the pond depends on various factors and is therefore subject to constant fluctuations, which must be kept in mind in the interests of pond creatures such as koi, sturgeon or goldfish. We explain what is important for an ideal oxygen supply in the pond and what can be done to increase the oxygen content in the pond.

How much oxygen does a pond need? How high should the oxygen content in the pond be?

The ideal value for oxygen in the water of the pond is 12 mg / l.

How do you measure the oxygen content in pond water?

This value can be determined with special water tests or with an expensive measuring device.
But you don't usually need one. The best way to recognize a lack of oxygen is in the early hours of the morning (around 6 a.m.) by observing the behavior of the fish. If the fish gasp for air on the surface of the water or frolic around the outlet of the filter, this is a clear sign of insufficient oxygen in the pond water.

How does a lack of oxygen in the pond come about?

Aquatic plants produce oxygen during the day. This is one of the end results of photosynthesis, a chemical process for which plants need sunlight as an energy source, among other things. They lack this at night, which is why they do not produce oxygen, but need it themselves for their cellular respiration. In addition, all animal pond inhabitants continue to consume oxygen during the night. In addition to aquatic plants and fish, the oxygen consumers also include almost all organisms in the pond. Even algae or microorganisms such as bacteria or microorganisms, which are important for biological degradation and decomposition processes, consume or need the oxygen in the pond.
The fact that no new oxygen is formed during the night, but large amounts of it are still required, means that around 5 o'clock in the morning there is the least amount of oxygen in the pond.

5 common causes of lack of oxygen in the garden pond

The equation is actually quite simple: the more oxygen consumers live in the pond, the more of the elixir of life they need. In the following, five causes are listed which can lead to insufficient oxygen supply in the pond.

1. Too many fish live in the pond.

Garden pond owners should adhere to these guidelines for the sake of their fish:
  • Goldfish: no more than 5 pieces per 1,000 l
  • Gold orfe: 500 to 1000 l per piece
  • Shubunkin: 300 to 500 l per piece
  • Appropriate Koi keeping starts at 5 m3 (5,000 l)
  • for the first koi: 5 m3
  • for each additional Koi + 1 m3

2. There are no, too few or too small aquatic plants in the pond.

The following are particularly suitable as oxygen producers:

3. Too much pond sludge (digested sludge) has deposited.

This is caused by dead plant residues, leaves and too much fish food. A regular removal of the sludge and cleaning of the pond is very important not least for a balanced oxygen content in the water.

From the causes mentioned so far, the logical conclusion emerges: the more fish there are in the water and the more waste, dirt or plant residues have to be decomposed in the pond, the greater the need for oxygen and thus the risk of “tipping over”.
The proportionality of the fish population and the regular cleaning of the pond are therefore essential measures to ensure the necessary oxygen content.

4. The water temperatures are too high in summer (excessive heating).

If that is the case, you have to provide (more) shade. The general rule is: Approximately one third of the pond surface should be in the shade. Ideal shade providers are:

Important background knowledge for garden pond owners: The oxygen content depends on the water temperature. The higher this is, the lower the dissolved oxygen content.

5. The pond is not deep enough.

In addition to the temperature of the water, the depth of the pond also has a major influence on the oxygen utilization. The shallower a body of water, the faster it heats up. However, with increasing temperature, the solubility of oxygen in water decreases. Only a pond that is deep enough guarantees that the water remains cool enough, even at high outside temperatures, to provide its inhabitants with the necessary amount of oxygen.

How does a lack of oxygen make itself felt in the pond?

  • The fish gasp for air on the surface of the water (especially on hot summer days).
  • They collect at the filter outlet.
  • In the warm months, snails stay directly under the surface of the water for longer periods of time.
  • Lack of oxygen is best noticeable in the morning, when photosynthesis in the plants has not yet started.

If the fish then show this behavior, the oxygen saturation of the pond should definitely be supported.

More oxygen for the pond:
How can I immediately increase the oxygen in the pond?

These tools quickly lead to a solution to the problem:
  • KOIPON Oxygen + FE - Immediate help in the event of acute oxygen deficiency
    If the condition is critical, you should be able to react particularly quickly. In such an emergency situation, KOIPON® Oxygen + FE provides quick and immediate help. The active oxygen against acute oxygen deficiency is suitable for all ponds.
  • Oxygen pump
  • fresh tap water
  • Aerator

How can I enrich the oxygen in the pond over the long term?

In order to establish a good solution in the long term, it is advisable to rely on filters and aerators.
This is the cheapest and most efficient method.
When purchasing pond accessories, you should pay attention to the correct size of the aerator.

Pond aerator: how to choose the right size

Since there are different models and the right choice is always the one that fits the size of your own garden pond, we answer the question with the help of these four sample products:

  • The Oase AquaOxy 250 pond aerator can supply ponds up to 3 m³ with oxygen-enriched water, the Oase AquaOxy 4800 pond aeration pump is suitable for ponds up to 50 m³. The latter can also be used as an ice preventer in the cold months and thus also ensures the oxygen supply in winter.
  • The Oase OxyTex Set is a tried and tested ventilation system with an air vent and oxygen pump. There are different sizes for different sized ponds.
  • The Oase AquaAir 250 is a large aerator that is suitable for pond surfaces up to 250 m².

Oxygen for the pond: do fountains or waterfalls help?

Many pond owners try to provide enough oxygen in the pond with fountains or waterfalls. Although this is decorative, it is also the most expensive solution for supplying the pond inhabitants with oxygen. Oxygen pumps and pond aerators are usually far more useful and also cheaper.

6 tips for the perfect oxygen supply in the pond

Finally, a brief overview of all the tips and measures that can ensure that the oxygen in the pond can correspond to the ideal value:
  1. ensure that the water depth is sufficient
  2. think about the planting (also with underwater plants)
  3. ensure sufficient shade
  4. Clean the pond regularly: In addition to manual and technical cleaning using filters, KOIPON® Oxalit is particularly recommended here, as it not only makes it easier to clean the pond floor from pond sludge and waste materials, but also contains active oxygen, which increases the overall content of the pond stabilized.
  5. use technical aids
  6. Check the fish stock and the amount of food