Technology is advancing, and aquaculture models are constantly being innovated and developed. As a modern farming method, factory circulating aquaculture is known as "the most potential farming mode in the 21st century" due to its characteristics of high density, high efficiency and low environmental impact.
This model not only improves the efficiency of water use, but also reduces environmental pollution, creating a more stable and controllable growth environment for farmed organisms.
While enjoying these advantages, water quality monitoring has become a key part of ensuring the success of farming. So, what water quality indicators do we need to monitor in factory recirculating aquaculture?
Step 1: Temperature
Temperature is one of the important factors for the growth of ringing aquatic organisms. Different kinds of farmed organisms have different requirements for water temperature, and too high or too low temperatures may adversely affect their growth. Therefore, in factory recirculating aquaculture, temperature is one of the water quality indicators that must be measured every day.
2. Dissolved oxygen
Dissolved oxygen is necessary for respiration by aquatic organisms. When the concentration of dissolved oxygen is below the critical level, the respiration of the cultured species will be inhibited, the growth rate will be slowed down, the immunity will be reduced, and may even lead to death.
3. PH value
PH value reflects the pH of water and has an important impact on the physiological function of aquaculture organisms. For example, the PH value of mariculture is controlled between 7.8 and 8.5, and the PH value of freshwater aquaculture is controlled between 6.5 and 8.0. The high carbon dioxide content of the water body in the process of factory farming is easy to lead to the decline of the PH value of the water body and the acidification of the guiding value. If there is a change, the basic reagents such as baking soda are used to adjust it in time.
4. Ammonia nitrogen and nitrite
Ammonia nitrogen and nitrite are one of the main pollutants dissolved in water in recirculating aquaculture system, and they mainly come from the excrement and residual bait of aquaculture organisms. High concentration of ammonia nitrogen and nitrite will be toxic to farmed organisms, affecting their growth, immunity and reproductive ability. Therefore, it is very important to monitor and control the concentration of ammonia nitrogen and nitrite in water. Through water treatment equipment such as biological filters, we can effectively reduce the content of these harmful substances.
5. Suspended particulate matter
Suspended particulate matter mainly refers to the total amount of solid particulate matter with particle size greater than 1 micron in the unit water body, including fish feces, residual bait, biological floc and so on. Suspended particulate matter will not only affect the transparency of water quality, but also may block the purification equipment and increase the burden of the biological filter. Therefore, it is also an important task to control the concentration of suspended particulates in factory recirculating aquaculture.
6. Other indicators
In addition to the above key indicators, there are other indicators that also need to be concerned about, such as ozone residues, trace elements (such as calcium, magnesium, potassium, phosphorus, etc.), and microorganisms and parasites in the water. These indicators also need scientific testing and reasonable regulation.
Detection point
The point for testing water quality is generally selected at the outlet, that is, the water body used by the fish.
At the same time, it is also necessary to detect the water intake, that is, to detect the data of the water after purification by the water treatment system.
By comparing the difference in the index of incoming and outgoing water, the treatment capacity and purification effect of the water treatment system can be understood.