Oxygen pumps are not the only major sources of oxygen supply in fish tanks.

Oxygen is the basis for the survival of fish and aquatic organisms. Tropical fish absorb oxygen from the water through their gills and the gas is exchanged for carbon dioxide. The oxygen content on the surface of natural water is higher than that under water, which can be used for fish and other aquatic organisms to survive. Therefore, the content of dissolved oxygen in water is not only related to the feeding of tropical fish, but also affects the growth, survival and ecosystem balance and stability of tropical fish, and is also one of the important indicators to measure water quality.

So how do you add oxygen to the fish tank? There are actually several sources of oxygen:

1. Biological oxygenation

The oxygen released by the photosynthesis of aquatic plants and phytoplankton in the grass tank, and the rise and fall of aquatic plants play an important role in dissolved oxygen in water. Under normal circumstances, the dissolved oxygen content of the grass tank is higher than that of the bare tank during the day.

2. Mechanical oxygenation

Forced oxygenation through air pump, submersible pump and other forms. Forced oxygenation of air pump is our main way of oxygen supply, and now many pumps combine these oxygen enhancement methods together, that is, four-in-one pumps sold in the market.

3. Chemical oxygenation

The addition of chemicals to increase oxygen is often used in the first aid of hypoxia. At present, the main chemical oxygenators used are calcium peroxide, hydrogen peroxide and peroxy ammonia (the main components of the oxygenator).

4. Change water and increase oxygen

The dissolved oxygen content can be increased by replacing new water, and the dissolved oxygen content can be increased by certain flow and drop in the process of water exchange.

5. The direct dissolution of oxygen in the air

The speed at which air dissolves into the water body is related to atmospheric pressure, water temperature, water flow, airflow and so on. With high atmospheric pressure, oxygen dissolves into the water quickly, and the amount of dissolved oxygen in running water is generally higher than that in still water, so a small waterfall pump causes fluctuations in the water surface and can also increase the rate of oxygen dissolution in the air.

Factors affecting dissolved oxygen content

1. Physical factors: the dissolved oxygen content of water is affected by water temperature, air pressure, salinity and other factors. The dissolved oxygen content of water is inversely proportional to water temperature and salinity. the higher the temperature is, the lower the dissolved oxygen is, and vice versa. The amount of dissolved oxygen in water is proportional to the pressure of the gas, and the higher the partial pressure of oxygen on the water surface, the greater the amount of dissolved oxygen.

When we use an air pump to supply oxygen to the fish tank, the deeper the surface of the water, the better the effect of dissolved oxygen. At the same time, the smaller the blisters are, the larger the relative area of contact with the water body is, the better the effect of dissolved oxygen is. The carbon dioxide bubble refiner used in the water tank is just carbon dioxide filled.

2. Biochemical factors: excessive number and density of aquatic organisms and too much feed residue will make the water eutrophication, increase the content of organic matter and decrease the amount of dissolved oxygen in water. The principle is that most of the decomposition of organic matter is the process of oxidation and oxygen molecules need to be absorbed.

Effect of dissolved oxygen on fish

Dissolved oxygen (DO) is an important factor affecting fish food intake, digestion and absorption rate after feed intake, growth rate and feed coefficient. The following is a simple analysis: low dissolved oxygen in water, fish appetite loss, or even refuse to eat, even if eating feed, it will cause low digestion and absorption rate, slow growth rate, lower feed utilization rate. In the long run, it will cause stunting and various diseases.

The feed utilization rate of fish at dissolved oxygen 3.0 ppm was twice as low as that at 4.0ppm. When the dissolved oxygen content of fish in water reaches more than 4.5ppm, the appetite of fish increases obviously, and when it reaches above 5ppm, the feed utilization ratio reaches the best value.

Some studies have shown that when the amount of dissolved oxygen in water decreased from 7.6ppm to 3.1ppm, the feed utilization rate decreased by 5.6 times and the growth rate decreased by 9 times to 10 times. Tropical fish require more than 7ppm dissolved oxygen in the water. If the dissolved oxygen in the water drops to 5ppm, the tropical fish will float. If no measures are taken, the tropical fish will be at risk of suffocation.

The oxygen consumption per unit body weight of fish decreased with the increase of fish body weight, while the oxygen consumption of individual fish increased with the increase of fish body weight. With the increase of water temperature, the metabolism of fish is prosperous, and the oxygen consumption of fish is also high. The greater the food intake of fish, the higher the oxygen consumption. In order for fish to grow rapidly, it is extremely important to ensure high dissolved oxygen in water. It should be pointed out that the higher the dissolved oxygen in the water, the better. When the supersaturation of dissolved oxygen in the pond water is more than 150% and the dissolved oxygen is more than 14.4ppm, it is easy to cause fish bubble disease. Under normal temperature and pressure, I think it is not easy to happen. Too much dissolved oxygen under normal pressure will automatically escape from the water surface.

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