The Harm of Nitrite Ammonia Hydrogen Sulfide Hazard in Aquaculture Water and Treatment Methods

April 11, 2021

Nitrite is an intermediate product in the conversion of ammonia to nitrate. Nitrite is more toxic to fish and shrimp and is an important factor in evoked fulminant diseases in aquaculture waters. When the concentration of nitrite in water reaches 0.1 mg/l, the number of red blood cells and hemoglobin in fish and shrimp will gradually decrease and the blood oxygen carrying capacity will gradually decrease, causing chronic poisoning of fish and shrimp. At this time, the food intake of fish and shrimp will be reduced. Diseases occur in the tissues, dyspnea, restlessness, or unresponsiveness. In severe cases, fulminant deaths occur. Treatment methods are: 1 start aerator or Quanchiposa chemical oxygenation agent, so that the pool of water has sufficient dissolved oxygen, in order to promote the conversion of nitrite to nitrate, thereby reducing the content of nitrite in water. 2Using ammonia ion chelating agent, activated carbon, adsorbent, humic acid polymer and other complexed water quality adsorbent such as nitrite degradation agent, through the ion exchange, adsorption or degradation of nitrite. 3 Use microbial preparations such as Bacillus, photosynthetic bacteria, nitrifying bacteria, and actinomycetes, such as live water treasure, to decompose nitrite by microorganisms. Ammonia nitrogen production is mainly caused by excess residual feed and the accumulation of large excrement of fish and shrimps and excessive fertilization. Ammonia nitrogen in normal culture water is generally not more than 0.2?/L. The harm of ammonia nitrogen to fish and shrimp is similar to nitrite.

Ammonia toxicity is closely related to the pH and water temperature of pool water. In general, the higher the temperature and pH, the stronger the toxicity. In addition to treatment methods such as aeration and the use of nitrites such as microbial preparations, methods of treatment may also be used: (1) Oxidizers such as Chlorine Dioxide (CHCl2) are splashed. 2 Sprinkle with zeolite or activated carbon, generally use 15 kg to 20 kg of zeolite per acre and 2 kg to 3 kg of activated carbon, which can absorb part of ammonia nitrogen. 3 Cultivation and planting of aquatic plants can occupy 1/100 of the total area of ​​the pool to absorb ammonia and other toxic substances.

In the absence of oxygen, hydrogen sulfide is produced from decomposition of anaerobic bacteria by residual organic compounds in the bait or feces. Hydrogen sulfide can combine with the metal salts in the bottom mud to form metal sulfides, resulting in blackening of the bottom of the pool. Hydrogen sulphide has a smelly smell of eggs and has a strong stimulant, anesthesia, and affects the respiration of fish. It is highly toxic to fish. The concentration of hydrogen sulfide in aquaculture water should be strictly controlled below 0.1 mg/L. Specific measures for controlling hydrogen sulfide 1 Increase the oxygen content of the water. 2 Severe fish ponds can splash 300 ml to 500 ml of hydrogen peroxide per acre and put a certain amount of iron scraps. PH value is an important indicator of water quality. The low PH value can reduce the PH value in the blood of farmed fish and shrimp and weaken its blood oxygen carrying capacity. Although the dissolved oxygen in the water is high, it still causes the physiological hypoxia of fish and shrimp, often floating head, and the growth is blocked or affected. disease. If the PH value is too high, the tissues of the fish and shrimps may be eroded, causing the fish and shrimps to lose their breathing ability and die in large numbers.

In addition, if the pH of the water is too high or too low, the activity of microorganisms in the water will be inhibited, and the organic matter will not be easily decomposed. Freshwater aquaculture PH value is generally controlled between 6.5 ~ 9.0, the best PH value range is 7 ~ 8. Treatment PH value is low: 1 with quicklime adjustment, each with 10 kg to 15 kg per acre. 2 A small amount of sodium hydroxide used to adjust the first deployment of 1/100 of the original liquid, and then washed with 1000 times the water spill. 3 Accelerate the cultivation of phytoplankton and promote algal blooms. Handle high pH: 1 Inject new water. 2 use alum, 0.5 to 1 kg per mu can be used to control. 3 adjusted with hydrochloric acid, generally with 300 ml per acre to 500 ml, fully diluted Quanchiposa.

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