How does ammonia nitrogen come from in aquaculture water?

Xiang Qing. Ammonia nitrogen is produced from harmful substances at the bottom of the aquaculture water body, including the feces and excessive silt layer of farmed fish and shrimp, as well as various decaying plant and animal carcasses.

Ammonia nitrogen is produced when these harmful substances decay and transform. Under normal circumstances, ammonia nitrogen will decompose along with the decomposition of harmful substances at the bottom of the water. However, once this decomposition process is affected or the decomposition rate is slower than the speed of the harmful substances produced at the bottom of the water, ammonia nitrogen will accumulate to the point that aquatic crops cannot bear it, and aquatic crops will be poisoned, resulting in large-scale death.

It is also very simple to control ammonia nitrogen, and if the water source is convenient, you can change the water frequently to reduce ammonia nitrogen. It can also increase the dissolved oxygen in the water, so that harmful substances can be decomposed faster, and the aerator can be opened.

Feed is the main source of nitrogen in water bodies. Nitrogen exists in water bodies in the form of nitrogen, free ammonia, ionized ammonium, nitrite, nitrate, and organic nitrogen. Among them, free ammonia and ionized ammonium are collectively called ammonia nitrogen.

Ammonia nitrogen is a common problem in aquaculture waters, especially in high-density intensive ponds, which brings great harm to aquaculture production.

This is mainly produced through photosynthesis, and the soil also contains such elements, which are then absorbed.

The ammonia nitrogen in the aquaculture water body is because the fish are farmed, and their excrement can slowly accumulate to produce ammonia nitrogen, so the aquaculture must change the water frequently to remove these harmful substances.

Pond dredging Regular cleaning of silt at the bottom of the pond can effectively reduce the amount of ammonia nitrogen at the bottom of the pond. Use quicklime or is.

Regular rationing of water Regular introduction of new water is a relatively quick and effective treatment and prevention solution, but in cloudy and rainy weather conditions.

Reducing the pH of the water body controls the toxicity of ammonia nitrogen by adjusting the pH, low pH, less toxic ammonia nitrogen, and vice versa, high toxicity. Among them are aquatic products.

Oxygenation In addition to using an aerator for oxygenation, aeration products can also be used. The dispersion of dry ponds can increase the amount of dissolved oxygen in the water body.

In that case, it should have come from their destruction, or it would have been from the space.

How does ammonia nitrogen come from in aquaculture waters? It is produced by compounds produced by the feces of fish in the aquaculture water body.

Normally, it comes from some nitrogen fertilizer and topdressing fertilizer from some aquatic products, so you must pay attention to this aspect.

How does the ammonia carbon in the aquaculture water come from, first of all, it is actually exhaled like a human carbon dioxide.

Conversely, ammonia carbon in water bodies is produced by the distillation of aquatic plants.

How to say this, it stands to reason that whether it is Ann or an egg, he may melt in the water. Usually there are some things inside this that contain ammonia and nitrogen. He would. Melt in water has this possibility.

<> Aquaculture Water Quality StandardsAquaculture Water Quality Standards:

1. Temperature. Eighteen to thirty-five degrees Celsius is the normal temperature, and twenty-five to thirty-two degrees Celsius is the most suitable temperature for growth.

2. PH value. From 6.5 to 8.5, the fertilizer efficiency below 6.5 can not play its advantages normally, ammonia nitrogen, hydrogen sulfide.

and so on.

3. Salinity. Zero to one percent, too high a salt content will affect the normal growth and reproduction of organisms in freshwater.

4. Ammonia nitrogen. Zero to 0.02 milligrams.

Every liter, too high will damage the gills of fish and mussels, and above 0.5 will cause inability to eat and breathe until death.

5. Hydrogen sulfide. Zero to 0.1 gram per liter, too high will damage the central nervous system of fish and mussels.

Anything above 0.5 can cause illness or death.

6. Nitrite.

Levels from 0.02 milligrams per liter can cause hemorrhagic disease, which is an important factor in the development of fulminant disease, and illness or death can occur above 0.5 milligrams.

7. Available phosphorus. 0.2 to 1 milligram per liter, below 0.2, high-quality algae in water bodies.

Growth is affected.

8. Dissolved oxygen.

Greater than or equal to 3 milligrams per liter, less than 3 milligrams per liter will affect the feeding of fish, less than 2 milligrams per liter will appear floating heads, less than 1 milligram per liter will appear flooding ponds, until a large number of deaths.

<> aquaculture ammonia nitrogen standard is that too high will damage the gills of hungry fish and mussels, and when Gao Tong returns, it will cause inability to eat and breathe until death. The harm of ammonia nitrogen to aquatic animals can be divided into acute disorder and chronic. Chronic Ammonia Nitrogen Poisoning Hazards:

Decreased feeding, slowed growth, failed molting, tissue damage, and reduced oxygen transport between tissues. Acute ammonia nitrogen poisoning hazards: aquatic organisms are excited, lose balance in the water, convulsions, and even death in severe cases.

1. Stop feeding: Stop feeding immediately regardless of whether aquatic animals are eating or not to reduce nitrogen production. 2. Start the aerator machine

Turn on the aerator and stir the water to allow the molecular ammonia to volatilize into the air. 3. Use sodium thiosulfate: sprinkle the whole pool after using sodium thiosulfate to transform the water, the dosage is 2-3 kg mu, and the dosage can be increased if necessary.

4. Use of biological agents: use photosynthetic bacteria, such as yeast, which can directly or indirectly utilize molecular ammonia.

1. How to deal with the high ammonia nitrogen in the aquaculture water

1. Stop feeding.

1) If it is detected earlier, aquatic animals may still be ingesting at this time, but there are no symptoms of poisoning.

2) Regardless of whether aquatic animals are feeding or not, stop feeding immediately to reduce nitrogen production.

2. Start the aerator machine

1) Set up an aerator to stir the water to volatilize the ammonia in its molecular state into the air.

2) The setting of an aerator can also allow the bottom water to interact with the surface water, which can reduce the content of ammonia molecules in the bottom water.

3. Use sodium thiosulfate.

2-3 kg of sodium thiosulfate per mu of pond (water sprinkling), if the ammonia nitrogen content is still not reduced to the ideal state, the dosage can be increased appropriately.

4. Use of biological agents.

1) Using photosynthetic bacteria, such as yeast, yeast can directly or indirectly utilize molecular ammonia.

2) It should be noted that Bacillus subtilis should not be used because it can speed up the decomposition of organic matter in the pond, and when organic matter is decomposed, ammonia molecules will be produced, which will further increase the concentration of ammonia nitrogen, causing serious consequences.

2. What is the cause of high ammonia nitrogen in aquaculture water?

1. In the process of aquaculture, the decomposition of bait, plankton residues and aquatic animal excrement in the pond will produce nitrogen-containing intermediate products, and most of these products exist in the form of ammonia.

2. If it is a farmed shrimp, the nitrogen element will be directly discharged into the water in the form of ammonia through the gills when the substance is metabolized in the body, thereby increasing the ammonia nitrogen content in the pond.

3. When there is a lack of oxygen in the water, nitrate, nitrite and nitrogen-containing organic matter will be denitrified under the action of anaerobic bacteria, and then ammonia will be produced.

4. When there is a lack of oxygen in the water, ammonia cannot be converted to nitrite under the action of nitrosifying bacteria, but is converted to nitrate, and then directly utilized by plants.

The total ammonia nitrogen content of China's fishery water quality standard should not exceed that.

Ammonia nitrogen is mainly free ammonia, which is dozens of times more toxic than ammonium salt, and increases with the enhancement of alkalinity. Ammonia nitrogen toxicity is closely related to the pH value and water temperature of the pool water, in general, the higher the pH value and water temperature, the stronger the toxicity, and the harm to fish is similar to nitrite.

The harm of ammonia nitrogen to aquatic organisms is acute and chronic. The hazards of ammonia nitrogen poisoning are: decreased food intake, slowed growth, tissue damage, and reduced oxygen transport between tissues.

Fish are sensitive to ammonia nitrogen in water, and high levels of ammonia nitrogen can lead to fish death. The hazards of acute ammonia nitrogen poisoning are: hyperactivity of aquatic organisms, loss of balance in water, convulsions, and even death in severe cases.

Many farmers do not pay attention to some of the previous preventive measures, resulting in frequent occurrence of ammonia nitrogen exceeding the standard in the middle and late stages of aquaculture every year, resulting in the phenomenon of shrimp ammonia nitrogen poisoning death, after the occurrence of ammonia nitrogen exceedance, it is necessary to deal with it in time to avoid delay, causing serious consequences. The specific steps and measures are as follows. a) Stop feeding bait immediately, if it is found that the ammonia nitrogen rises earlier, there may not be symptoms of poisoning at this time, the shrimp is still feeding, regardless of whether the shrimp is feeding or not, the first step is to stop feeding the bait immediately and reduce the nitrogen delivery.

b) Start the aerator to stir the water body and carry out sufficient aeration to promote the volatilization of ammonia in the molecular state into the air. The bottom water with high molecular ammonia content is mixed with the surface water with low content to reduce the content of ammonia molecules in the bottom water. c) Sodium thiosulfate (commonly known as Haibo) is used in shrimp and shrimp ponds, and the whole pool is splashed after dissolving in water, using 2 3 kg of this product per mu, if the ammonia nitrogen content is still not reduced to the ideal state, the amount can be increased as appropriate; This product** is low, the cost of mass use does not increase much, and it will not cause harmful residues in the water body to reduce the level of ammonia nitrogen in the water.

d) The use of biological agents, biological agents can only choose to use photosynthetic bacteria, yeast and other bacteria that can directly or indirectly use molecular ammonia, at this time do not use Bacillus subtilis, Bacillus subtilis will promote the decomposition of organic matter in the pond, the intermediate metabolites are mainly ammonia molecules, Bacillus subtilis promotes the superposition of ammonia molecules released from organic matter and the original ammonia molecules, which will further increase the concentration of ammonia nitrogen, causing serious consequences. e) Use drugs to reduce the pH value of the water body, because the pH value significantly affects the concentration of molecular ammonia, and after the ammonia concentration exceeds the standard, the alkali-lowering drugs are used to splash the whole pool to reduce the proportion of ammonia nitrogen, thereby reducing the toxicity. f) the use of glucose, calcium chloride or salt poured throughout the pool, these three substances can not eliminate or convert ammonia nitrogen, but can reduce the toxicity of ammonia nitrogen, and reduce the effect of pH value, after reducing the toxicity of ammonia nitrogen, stop feeding, with the improvement of dissolved oxygen microecological agents of the combined effect, in 2 3 days the total amount of ammonia nitrogen can be reduced.