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about the nutrition of high temperature to prevent diseases, algae and fungi in the water
Aug 12, 2020
How to prevent the occurrence of diseases during the high temperature period? Now it's the high temperature period, the highest temperature has exceeded 30 ℃, it is also a period of frequent diseases, especially the diseases dominated by bacterial diseases, which will bring a new round of crisis to the entire aquaculture industry. Therefore, how will we minimize the disease in this hot season?

We should all understand a simple truth: disease is easy to prevent, but it is quite difficult to treat. However, in the actual production process, farmers often think of treating fish and shrimps when they are diseased, but when a disease is discovered, the treatment often only reduces the loss, and some even lose money.

Therefore, we must know how to take precautions and control the disease before it occurs, rather than thinking about treatment when you are sick.

How can we prevent problems before they happen?

1. During the high temperature period, due to the hot temperature and high water temperature, the organisms in the water are in a rapid growth period, especially the growth and reproduction of microorganisms are vigorous, so bacterial diseases are the main diseases during this period;

2. Due to the high water temperature, the aquaculture animals are also in the rapid growth period, fish and shrimp eat vigorously, have a large appetite, and eat more, so hepatobiliary syndrome is also the main disease during this period;

3. Due to the high water temperature, the algae grow vigorously in the water, and the dissolved oxygen in the upper layer of the water body is supersaturated, but the dissolved oxygen in the lower layer of the water body is often in a state of insufficient, mainly due to thermal stratification and the large amount of oxygen consumption by the bottom microorganisms, and the feed is too much. Therefore, the large accumulation of harmful substances such as ammonia nitrogen and nitrite was also the main disease during this period.


Diseases in the high temperature period often do not occur individually, but occur comprehensively. That is, the above three conditions occur simultaneously or more diseases occur at once. Therefore, when a disease occurs, it is quite difficult to control the disease at once.

How to prevent the occurrence of diseases during high temperature?

1. Reduce the water temperature:

The water temperature can be reduced by changing the water; set up shading sheds or shading nets; speed up the flow of water, such as using more aerators; splashing "stable VC" and other products that can cool down!

2. Reduce the accumulation of harmful substances such as ammonia nitrogen and nitrite:

On the one hand, it is necessary to reduce the amount of feed; on the other hand, oral administration of "lactic acid bacteria", "highly active bacillus" and other beneficial bacteria can reduce the discharge of harmful substances such as ammonia nitrogen and nitrite in the feed; the water can be changed regularly Water; regular use of microbial agents, such as "Rhododendron", "Gunengxin", etc., to control the accumulation of ammonia nitrogen, nitrite, etc. in the water body; regular use of carbon source products, such as "Amgen Feiba", with carbon Promote nitrogen and allow beneficial microorganisms to consume nitrogen sources in the water.

3. Reduce the use of oxygen-consuming microorganisms:

On the one hand, the large-scale use of aerobic microorganisms, such as Bacillus, will cause the water body with insufficient dissolved oxygen to have lower dissolved oxygen, which will cause severe flooding; on the other hand, the aerobic microorganisms will generate a lot of heat when they grow and reproduce. Make the water temperature higher and the dissolved oxygen lower.

4. Increase the bottom dissolved oxygen:

Open more aerators, especially at noon, let the bottom water rise to the surface to increase the dissolved oxygen of the bottom; you can add aeration equipment such as the bottom aeration nanotubes to increase the bottom dissolved oxygen; in the evening or night, you can use "Amgen Giant Oxygen "To increase the dissolved oxygen in the bottom layer.

5. Control the amount of feed:

Don't let the fish and shrimp eat too full, generally only feed 70 to 80% full, especially in bad weather such as high temperature and heavy rain. You should reduce the feeding amount or stop feeding once a week to allow the fish and shrimp to rest and rest properly. Don’t think that eating more can make you grow faster. That is when you don’t get sick, once you get sick, you eat more and die faster.

Adhere to the above 3 minus 1 plus 1 control, which can effectively prevent the occurrence of diseases during the high temperature period. Remember that diseases can only be prevented and are difficult to treat, and the loss during the treatment process is also great. Therefore, preventive measures must be taken to minimize the occurrence of diseases. Don't know regret when the fish and shrimp are sick, it is too late there.

How much do you know about the nutrition of algae and fungi in the water? The feed is customized for fish and shrimp, and the nutrition is only suitable for the growth of fish and shrimp itself, not suitable for the growth and reproduction of algae and fungi in the water, so the ecological balance of the water body is affected, which in turn affects the growth of fish and shrimp. We all provide suitable nutritional feed for fish and shrimp, why not provide suitable nutrients for algae and fungi?


Providing suitable nutrients for algae and fungi is beneficial to the establishment and stability of water ecosystems.

The growth and reproduction of all living things cannot do without the absorption and utilization of nutrients, whether it is fish or shrimp or algae and fungi. Therefore, we must not only understand the nutritional needs of fish and shrimp, but also the nutritional needs of algae and fungi. You can keep fish and shrimp well.

Fish and shrimp cannot grow up when they are full, and the living environment also plays an extremely important role in their growth.

A water diversion expert is actually a nutrition expert. He is an expert who has a better understanding of the nutritional needs of algae and fungi in water bodies. If you don’t even know the nutritional needs of algae and fungi, you cannot be said to be a water diversion expert.

What are the nutritional requirements of algae?

The nutrition of algae is mainly inorganic salts, including nitrogen, phosphorus, potassium, etc., among which there are some trace elements and growth factors and carbon dioxide in water. However, due to the low carbon dioxide content in water, carbon dioxide can generally be obtained from bicarbonate in water. Perform photosynthesis.

What are the nutritional requirements of fungi?

The nutrients of fungi are mainly carbon sources, nitrogen sources, inorganic salts, growth factors, and water. At first glance, they seem to be completely different from algae, but in fact, people who are careful will find that their nutritional needs are similar.


The difference between the nutritional requirements of algae and fungi:

The nutritional requirements of algae and fungi are basically similar. They are all five major nutrients: carbon source, nitrogen source, inorganic salt, growth factor and water; they are both the basis of protein. Although the overall situation is the same, there are actually some differences. The carbon source of algae is carbon dioxide, which is inorganic salt, while the carbon source of fungus is carbon-containing compound and inorganic salt. The main carbon source of heterotrophic fungi is sugars, such as glucose, sucrose, molasses, etc.; the main carbon source of autotrophic fungi is carbon-containing inorganic salts, such as bicarbonate, carbonate, carbon dioxide, etc. Algae is almost the same. Other nitrogen sources, inorganic salts, and growth factors are similar.

The nutritional difference between algae and fungus is mainly:

Algae generally only absorb inorganic salts as nutrients, while fungi absorb organic matter and inorganic salts as nutrients.

Different algae have different requirements, but it is still based on the five major nutrients, but the required proportions are different. Therefore, it is necessary to cultivate different algae according to the nutritional needs of different algae, such as the nutrition of green algae. Mainly carbon, nitrogen, phosphorus, and potassium, the ratio is generally 30:6:1:1, and diatoms also have a certain amount of silicate, cyanobacteria, gymnodinium, etc. due to the imbalance of carbon and nitrogen, resulting in a large number of harmful algae Breeding, seriously affecting the ecological balance of water bodies.

The nutritional requirements of different fungi are also different, mainly in the choice of carbon source, but the dissolved oxygen in the water has a greater impact on different fungi. According to the demand for dissolved oxygen, microorganisms can be divided into aerobic bacteria, anaerobes and facultative anaerobes.


For algae, although the nutrients are often eutrophication during the breeding process, the nutrients in it are difficult to use for the algae, because the organic matter is excessive, and the algae generally cannot be used, resulting in nutritional imbalance, such as nitrogen. Too many sources, but insufficient carbon sources. Therefore, during the breeding process, the algae often suffer from aging and death due to insufficient nutrition, so it is necessary to regularly supplement the appropriate amount of nutrients to make the algae grow healthy.

For fungi, in the breeding process, nutrients are generally too much, so we are more concerned with whether the amount of dissolved oxygen in the water is sufficient. One is the growth needs of farmed animals; the other is the growth needs of aerobic bacteria. If there is insufficient dissolved oxygen in the water, anaerobic bacteria will inevitably grow in large numbers, causing a large number of pathogenic bacteria to multiply, and thus cause the occurrence of diseases.

The pathogenic bacteria in the water are mainly anaerobic bacteria. Therefore, by reducing the nutritional requirements of pathogenic bacteria or changing their growth environment, the purpose of affecting the growth of anaerobic bacteria can be achieved. However, eutrophication often occurs in the breeding process, so reducing the nutrient requirements is not feasible. The only way to reduce pathogenic bacteria is to change the growth environment. Increasing the amount of dissolved oxygen in the water is the most effective way to inhibit the growth and reproduction of pathogenic bacteria. (Amgen Fisheries Finishing)
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