What symptom does nitrite poisoning have?
??? In aquaculture, nitrite is a common pollutant, if the content of nitrite in water is too high, it will be harmful to aquaculture fish and shrimp. When fish and shrimp are exposed to high concentration of nitrite, it will have adverse effects on their physiological function, and even lead to death.
?So thisWhat are the symptoms?
1. Symptoms of nitrite poisoning in fish and shrimp
1. Abnormal behavior: abnormal swimming movements, such as hiding, wagging, fluttering, etc.
2. Difficulty breathing: Rapid breathing, lack of oxygen and open mouth.
3. Body color change: A change in body color, usually from pale yellow or pink to dark brown or black.
4. Abnormal water quality: abnormal water quality, such as turbid water, odor, etc.
5. Loss of appetite: fish and shrimp no longer have the same appetite as before, and even refuse to eat.
6. Increased mortality: If the degree of poisoning of fish and shrimp is excessive, the mortality rate will increase significantly.
2. Biological mechanism of nitrite poisoning in fish and shrNitrite mainly affects respiration and blood circulation of fish and shrimp. Nitrite will combine with the hemoglobin in the blood of fish and shrimp, forming nitrohemoglobin. This nitrohemoglobin binds to oxygen more easily than ordinary hemoglobin, which leads to the reduction of oxygen in the body of fish and shrimp, causing hypoxia. anoxia Cause fish and shrimp shortness of breath, mouth open and other symptoms. Nitrites damage red blood cells in the blood of fish and shrimp, causing them to deform and break. This leads to the accumulation of metabolic waste in the body of fish and shrimp, obstructing blood circulation, resulting in damage to internal organs and even death. Nitrites also affect the immune systems of fish and shrimp, making them
Decreased resistance to bacterial infection and susceptibility to disease.
??? The formation of nitrite is due to the reduction reaction of ammonia nitrogen and nitrate under the action of microorganisms. Under normal circumstances, the process of nitrite production in fish and shrimp ponds is divided into two stages: the first stage is the conversion of ammonia nitrogen into nitrite; The second stage is the conversion of nitrite to nitrite. Therefore,
??? There are two methods to control nitrite content in water quality: one is to control the concentration of ammonia nitrogen through reasonable feeding and sewage discharge to avoid its excessive accumulation; The other is to promote the transformation of nitrite into nitrite by increasing nitrifying bacteria or adding nitrifying agents.
Methods to prevent nitrite poisoning of fish and shrimp
??? 1. Test water quality regularly
??? Regular inspection of water quality is an important step to prevent nitrite poisoning of fish and shrimp. The test items include ammonia nitrogen, nitrite, nitrate, etc., which can be carried out by professional testing institutions or laboratories.
??? 2. Control the amount of feed and discharge
??? The key to prevent water pollution is to control the quantity of feed and discharge reasonably. Feeding should be carried out according to the demand of fish and shrimp to avoid excessive feeding, which may cause high ammonia nitrogen content in water. At the same time, regular cleaning bait, feces and other waste, to keep the water clean.
??? 3. Increase water ventilation
??? Increasing water ventilation is helpful to increase the oxygen content in water and alleviate the effect of nitrite on fish and shrimp. This can be achieved by increasing the amount of oxygen in the water and installing oxygenating equipment.
??? 4. Strengthen management
??? Strengthening culture management can improve the efficiency of culture, but also help to prevent nitrite poisoning of fish and shrimp. Water bodies can be kept clean and healthy by regular water changes, pond cleaning, disinfection and sterilization.
??? In conclusion, the key to prevent nitrite poisoning of fish and shrimp lies in water pollution control, rational feeding and strengthening aquaculture management. Only by keeping the water clean and improving the tolerance of fish and shrimp to nitrite can we effectively prevent the occurrence of nitrite poisoning and ensure the stable development of aquaculture industry.
