Whether it is fish, mussels or other aquatic organisms, there must be an suitable environment for their growth in order to achieve a good harvest. The environmental conditions of water are one of the important reasons that affect the yield of aquatic products. With the acceleration of the construction of the Internet of Things, the intelligence of aquaculture has also become a development trend of large-scale aquaculture in the future. Using the Internet of Things intelligent platform, sensors collect front-end data, and send it back to the control center through the cloud platform to guide and improve aquaculture measures in a timely manner to increase the benefits of aquaculture. For example, according to different weather conditions, the aerator should be turned on in time to ensure that there is enough dissolved oxygen in the fish pond. Usually, aquaculture does need to pay attention to the water quality conditions of the pond, such as the pH value, oxygen content, ORP value, ammonia nitrogen content and other data of the water body. Once the data is abnormal, necessary measures must be taken in time, otherwise it may lead to loss and accident.
Three important indicators affecting aquaculture
Dissolved oxygen: refers to the oxygen content in the water, which is an important factor affecting the results of aquaculture. The dissolved oxygen content varies with temperature, pressure, salinity and other factors..
- The fish in the water are extremely sensitive to the oxygen content in the water. The dissolved oxygen required for the normal growth and development of the farmed fish is generally above 4-5 mg/L. At this time, the fish have good food intake, fast growth and high feed utilization.
- When the dissolved oxygen is lower than 2mg/L, the fish basically stop feeding;
- When the dissolved oxygen is lower than 1mg/L, the fish will float;
- When the dissolved oxygen is lower than 0.5mg/L, the fish will suffocate and die.
pH value: pH value is a comprehensive indicator reflecting water quality status and an important factor affecting fish activity.
Too high or too low pH value will directly harm fish, cause physiological function disorder, affect their growth or cause other diseases, and even death.In aquaculture ponds, the pH varies greatly, mostly between 7.5 and 9.0. In special cases, it can be lower than 2 or higher than 11.
In acidic water, it will reduce the pH of the blood of fish and shrimp, reducing their oxygen-carrying capacity, so that fish and shrimp will also float in the environment of higher dissolved oxygen, that is, physiological hypoxia. Fish and shrimp do not like activities, their metabolism is slow, their food intake and digestibility decreases, their growth is inhibited, leads to low survival rate.
ORP: ORP is one of the very important water quality indicators. Although it cannot independently reflect the quality of water quality, it can reflect the ecological environment in the aquatic system by integrating other water quality indicators.
Generally, farmers are accustomed to monitoring the concentration of water quality indicators such as NO2, H2S, NH3/NH4+ etc., and think that these substances are the main reasons for the disease of aquatic product. However, these substances are also the result of various biochemical reactions, and their concentration in water is the result of ecological changes in the entire water quality, not the real source.
Since the redox potential determines whether the biochemical reaction can proceed, it is necessary to monitor the redox potential in advance to know whether it is within the normal range, and take appropriate measures in advance to change the redox potential in the sediment and water, thereby affecting the activity of microorganisms. Only by influencing the direction of the chemical reaction and finally making it move in a favorable direction can the production of toxic and harmful substances be truly reduced.
Therefore, ORP is a leading indicator of water quality changes to a certain extent, and can play a good early warning function.
Flexible solutions for greater efficiency and productivity of the future aquaculture
The traditional breeding method is that experienced fishermen judge whether the water quality of the pond is in the best breeding state by observing the floating head of the fish to judge whether there is oxygen deficiency. This method cannot timely and accurately judge the specific conditions of the water quality of the fish pond, which affects the growth of fry to a certain extent, and increases the risk and cost of breeding.
With the continuous development of "Internet of Things" technology, more and more fishermen feel the benefits brought by the new technology. For fishermen, accurate information such as dissolved oxygen, water temperature, pH value, ORP, etc. of aquaculture ponds can be checked in a timely manner on the smart aquaculture system, so as to understand the water quality and reduce the risk of aquaculture.
The intelligent aquaculture equipment platform is mainly an intelligent online water quality monitoring instrument. Through the multi-parameter intelligent water quality detection platform and other Internet of Things equipment, it can control the dynamics of the aquaculture pond and guide the fishermen to improve the quality and output of aquaculture.
The sensor of the terminal can monitor the dissolved oxygen, pH, water temperature, ORP and other environmental indicators in the water in real time, and then transmit the collected data to the display or cloud platform through the collector and the Internet of Things platform, so as to check the water quality of the pond in time through the mobile phone APP to accurately control when to add oxygen and feed, and it is no longer necessary for experienced fishermen to inspect the fish pond every day, and judge whether the fish need to open the aerator by observing the shape of the fish.
▲MW-O101 dissolved oxygen sensor
MW-O101 dissolved oxygen sensor, the hot sale model, is an electrochemical sensor with low power consumption, simple maintenance, convenience and practicality.
It is widely used in ORP value detection in the fields of laboratory scientific research, water supply, wastewater treatment, aquaculture, farmland irrigation, etc. The MW-O201 sensor is a polarographic dissolved oxygen sensor. Under a certain polarization potential of the sensor, the oxygen dissolved in the water body will pass through the oxygen permeable membrane, and a redox reaction will occur on the surface of the working electrode, and the resulting current is proportional to the concentration of dissolved oxygen in the water body. The concentration of dissolved oxygen in water is estimated by measuring the magnitude of the current.
It is widely used in ORP value detection in the fields of laboratory scientific research, water supply, wastewater treatment, aquaculture, farmland irrigation, etc. The MW-O101 sensor is a polarographic dissolved oxygen sensor. Under a certain polarization potential of the sensor, the oxygen dissolved in the water body will pass through the oxygen permeable membrane, and a redox reaction will occur on the surface of the working electrode, and the resulting current is proportional to the concentration of dissolved oxygen in the water body. The concentration of dissolved oxygen in water is estimated by measuring the magnitude of the current.
MW-TDS101 sensor is an on-line water quality detection sensor, which can be used to detect the content of total dissolved solids (TDS) in water to judge the cleanliness or pollution of water. The unit of measurement for TDS is mg/L, which indicates how many mg of dissolved solids is dissolved in 1L of water. The higher TDS value, the more dissolved solids the water contains.
MW-NH101 sensor is an electrochemical ammonia nitrogen water quality detection sensor. Ammonium ions in the solution to be tested permeate through the sensor selective membrane, causing changes in membrane potential, and the change in membrane potential is proportional to the concentration of ammonium ions in the solution. Ammonium ion concentration.
MW-RCl101 sensor is a polarographic residual chlorine water quality detection sensor The residual chlorine molecules in the measured solution pass through the selective membrane of the sensor and reach the cathode surface of the electrode. Under the polarization of the polarization potential, the residual chlorine molecules get electrons and are reduced, and the anode loses electrons and is oxidized. At the same time, a current signal is generated, and the magnitude of the signal is proportional to the residual chlorine concentration. The residual chlorine concentration is judged by detecting the magnitude of the current signal during the electrode reaction process.
MW-ORP101 sensor is a primary battery type ORP water quality detection sensor. The sensor measures the potential difference in the measured solution obtained by the working battery composed of the electrode and the counter electrode. To determine the ORP value of the measured solution use the relation of equality between the ORP value of measured solution and measured potential difference.
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