How to deal with high nitrite

Many people will find high nitrite levels when testing urine. This is mostly because the urinary system is infected by some bacteria and needs to be treated with antibiotics. For aquaculture, if the nitrite level in the aquaculture water is too high, it is not conducive to the growth of fish. Farmers need to use some drugs to reduce the nitrite level in the water. So how to deal with high nitrite levels?

2 During the breeding process, if the indicators such as nitrite, ammonia nitrogen, hydrogen sulfide, and pH value in the breeding water are too high, it will cause great harm to the farmed aquatic animals.

3 Causes of formation: Nitrite is an intermediate product in the process of converting ammonia to nitrate. In the aquaculture water, due to the large amount of bait left over, the accumulation of a large amount of excrement of aquatic animals in the water body and the regular use of disinfectants, harmful and beneficial bacteria are all killed, and the oxygen supply is insufficient, resulting in a large amount of accumulated nitrogen. The nitrification process is blocked.

4 During aquaculture, the content of ammonia nitrogen and nitrite nitrogen in the water is high, but due to the rapid conversion rate of ammonia nitrogen, the problem of nitrite nitrogen is the most prominent.

Hydrogen sulfide is produced by anaerobic bacteria decomposing sulfur-containing organic matter in leftover bait or feces under anaerobic conditions. Hydrogen sulfide can combine with metal salts in the bottom mud of water bodies to form metal sulfides, causing the bottom of the pool to turn black.

6 Its mechanism of action is mainly through the respiration of fish and shrimp, entering the blood through the gill filaments, the number of red blood cells and hemoglobin in fish and shrimp gradually decreases, the oxygen-carrying capacity of the blood gradually decreases, and tissue hypoxia occurs. At this time, the food intake of fish and shrimp decreases, lesions appear in gill tissue, and they have difficulty breathing, become restless or slow to react, which leads to lack of oxygen and even death from suffocation.

7 Nitrite can also react with secondary amines to generate carcinogenic nitrosamines. Low pH values ​​are conducive to the formation of nitrosamines. Many ponds are experiencing anorexia of fish and shrimp, and excessive nitrite is one of the main reasons.

① Turn on the aerator or spray chemical oxygenators throughout the pool to ensure that the pool water has sufficient dissolved oxygen to promote the conversion of nitrite to nitrate, thereby reducing the nitrite content in the water.

② Use activated carbon. Sprinkling 2 to 4 kg of activated carbon powder per mu has a certain effect, but the cost is also high; or spray "nitrite degrader" to adsorb or degrade nitrite through ion exchange.

③Spray zeolite. Generally, 15 to 20 kg of zeolite is used per mu.

④ Spray Bacillus, photosynthetic bacteria, nitrifying bacteria, actinomycetes and other microbial preparations into the water body to decompose nitrite through microorganisms.

⑤ Cultivate and plant a small amount of aquatic plants to absorb toxic substances such as ammonia nitrogen.

9 When the hydrogen sulfide content is too high, the treatment method is to increase the dissolved oxygen in the water; in serious cases, 300 to 500 ml of hydrogen peroxide can be sprayed per acre in the fish pond and a certain amount of iron filings can be added.

3. In the process of aquaculture, the pH value of freshwater aquaculture water is generally 6.5-8.5, and that of seawater aquaculture is 7.0-8.5.

10 When the pH value is too high, first replace part of the pond water or inject new water; sprinkle 0.5 to 1 kg of alum per acre of pond to control it; use 300 to 500 ml of hydrochloric acid per acre, dilute it thoroughly and then sprinkle it throughout the pond.

10 When the pH value is too low, use 10 to 15 kg of quicklime dissolved in water per acre each time and then sprinkle it throughout the pond; for a fish pond with a water depth of 1.5 meters, apply 110 to 190 kg of wood ash per acre, which can not only increase the pH value, but also promote the reproduction of plankton, providing sufficient natural bait for the growth of fish.