Aquaculture water quality testing is normal
Recirculating aquaculture is a high-efficiency, energy-saving, and environmentally-friendly farming method. It can effectively save water resources and reduce the discharge of aquaculture wastewater, thereby achieving the purpose of improving aquaculture efficiency and protecting the environment. In recirculating aquaculture, the quality of water directly affects the breeding benefits and animal health, so the detection and management of recirculating water is very important. So, how much Water Quality testing for recirculating aquaculture is normal? Which indicators need to be tested? Let's introduce it in detail below.
1. How much Water Quality is normal for recirculating aquaculture?
1. pH
The pH value is an index to measure the acidity and alkalinity of the water body. For circulating aquaculture, the normal range of the pH value should be between 6.5 and 8.5. When the pH value is too high or too low, it will affect the growth and metabolism of microorganisms, thereby affecting the stability of water quality and the health of animals. Therefore, when carrying out recirculating aquaculture, it is necessary to regularly detect the pH value and adjust it in time.
2. Dissolved oxygen
Dissolved oxygen is an index to measure the oxygen content in the water body. For recirculating aquaculture, the normal range of dissolved oxygen should be between 5~8mg/L. When the dissolved oxygen is lower than 5mg/L, it will lead to hypoxia in the water body, which will affect the growth and metabolism of aquatic organisms, and also affect the respiration and health of animals. Therefore, when carrying out recirculating aquaculture, it is necessary to regularly detect the amount of dissolved oxygen, and to increase oxygen in the aquaculture water through pure oxygen aeration equipment in time.
3. Temperature
Temperature is an index to measure the temperature of the water body. For most fish and shrimp and other animals, the normal range of temperature should be between 20 and 30°C. Temperature is the most important factor affecting animal growth rate, digestion and absorption. At the same time, the constant temperature also plays a very important role in the stability of water quality. The ambient temperature is constant, the fish and shrimp are less stressed, and the growth rate is faster. Therefore, in circulating aquaculture, constant temperature equipment is essential.
4. Ammonia, nitrite and nitrate
Ammonia nitrogen, nitrite and nitrate are indicators to measure the nitrogen content in water. For recirculating aquaculture, their normal ranges should be 0.1~0.5mg/L, 0~0.2mg/L and 0~10mg/L respectively. Between L. When these indicators exceed the normal range, it will cause poisoning of fish and shrimp. Their harm is a key link in the success of factory aquaculture. Generally, they are removed through the biological filter in the system. Nitrifying bacteria or heterotrophic bacteria are attached to a large number of filter materials, which can convert ammonia nitrogen and nitrite into non-toxic nitrate.
5. Total Phosphorus and Total Nitrogen
Total phosphorus and total nitrogen are indicators to measure the content of phosphorus and nitrogen in water bodies. For recirculating aquaculture, their normal ranges should be between 0~0.2mg/L and 0~2mg/L respectively. When these indicators exceed the normal range, it will lead to the deterioration of water quality, affect the growth and metabolism of microorganisms, and then affect the health of animals. Total phosphorus is generally removed by filtering the organic matter in the water. Overall, total phosphorus has little effect in recirculating aquaculture systems. There is a certain relationship with COD.
2. Which indicators need to be tested?
As mentioned above, the indicators that need to be detected in recirculating aquaculture include pH value, dissolved oxygen, temperature, ammonia nitrogen, nitrite, nitrate, total phosphorus and total nitrogen. These indicators reflect the acidity and alkalinity, oxygen content, temperature and main nutrient salt content in the water body. By regularly testing these indicators, water quality problems can be discovered in time, and corresponding measures can be taken to adjust to ensure the quality and stability of circulating water, thereby improving breeding efficiency and animal health.
3. Summary
Recirculating aquaculture is an efficient, energy-saving and environmentally friendly aquaculture method, but in actual operation, the quality of recirculating water needs to be regularly tested and managed. Routine detection indicators include pH value, dissolved oxygen, temperature, ammonia nitrogen, nitrite, nitrate, total phosphorus and total nitrogen. By regularly testing these indicators and taking corresponding measures to adjust them in time, the quality and stability of circulating water can be guaranteed, and breeding benefits and animal health can be improved.
