In the aquaculture circle, almost no one does not know the truth: "fish farming first raises water." Water is the environment in which aquatic products depend for survival. The quality of the environment will have a direct impact on the quality, yield and mortality of aquatic products, and ultimately affect the benefits of aquaculture enterprises (households). At the same time, because some farmers do not pay attention to water quality, the focus of treatment and disease prevention is on the application of drugs, directly reducing the quality of aquatic products and increasing legal risks. But how to ensure the water quality? The principle of ensuring water quality is very simple: first, we must know what the water quality is, and then take corrective measures when we know that there is a problem with a water quality indicator, and finally understand what the corrected water quality is. So reciprocate until the water quality meets the requirements. It can be seen from this that knowing the water quality is the basis for ensuring water quality. If the water quality cannot be accurately understood, there is no guarantee of water quality, let alone improve quality, yield and reduce the risk of death. To understand what is the water quality, it is necessary to consider how the water quality will change in the water. In the process of breeding, aquatic products need to breathe, and there is a requirement for the oxygen content in the water. If the dissolved oxygen in the water is insufficient, the floating head and suffocation will be severely killed, and the light will affect the body quality and growth rate of the aquatic product. Therefore, it is necessary to measure the dissolved oxygen; Debris, feces, and the deposition of animal and plant corpses decompose under the action of microorganisms to produce a large number of harmful substances such as ammonia nitrogen, nitrous oxide, and hydrogen sulfide. These light people will affect the growth rate of aquatic products, and the serious ones will cause poisoning of aquatic products. Therefore, it is necessary to measure ammonia nitrogen, nitrite, hydrogen sulfide, especially ammonia nitrogen and nitrite; if aquatic products survive in water, there will be an optimum temperature suitable for water, so it is necessary to measure the temperature; each aquatic product has a specific pH for water. Required, therefore need to check the pH. Since the water quality is dynamically changing, such as dissolved oxygen, the dissolved oxygen in the morning and evening water changes, so the water quality is measured several times a day. For the same aquaculture water, the water quality is different in different locations and depths, so the water quality needs more measurements. It is possible to clearly grasp the water quality through multiple and multi-point measurements of important indicators of aquaculture water quality. Only when the water quality is clearly mastered can we take targeted actions to improve water quality. Precautions can be made beforehand rather than afterwards – the cost of pre-existing prevention is much lower than the cost of ex post remedies. How can we accurately understand the water quality? China's aquaculture industry is undergoing a development stage from primary to advanced, from extensive to scientific, from free-range to factory farming. Correspondingly, the detection method of water quality also undergoes the development stage of eye-sense, kits, and on-site testing instruments (portable instruments and online instruments). The traditional way of seeing the nose--for small-scale extensive farmers, the way to look at the behavior of water and aquatic products with eyes and the smell of smell with the nose is still used, but it is difficult to find problems in advance when problems are discovered. Already causing damage to aquatic products, especially for densely populated farming, the situation is more serious; Kits - There are many farmers and even aquaculture companies that rely mainly on kits. This method is slightly better for detecting water quality than eyesight. However, due to the limited accuracy of the kit, it is still semi-quantitative. Quickly and accurately understand the water quality. Taking ammonia nitrogen detection as an example, the general kit, the test range is not continuous, the range is in such a range: 0.20-0.40-0.60-0.90-1.20-1.50mg/L, but for general aquatic products, the ammonia nitrogen in the water is above 0.2mg/L. It has been slightly toxic to aquatic products, and over 0.5 mg/L has indicated that water quality has deteriorated. Obviously the accuracy of the kit does not meet the requirements for accurate measurement of water quality; Water Quality Testing Instruments - Due to the increased level of farming, more and more companies are using instruments to detect water quality. There are three kinds of general instruments, one is portable instrument, the design can meet the needs of on-site inspection, including easy to carry, shockproof and waterproof, easy to operate; one is laboratory equipment, the water sample should be taken back to the laboratory for testing; the third It is an online instrument. The instrument is installed in the breeding ground, and is transmitted back to the control room through the data line in real time, or the water quality test result is transmitted to the user's priming device (such as a mobile phone) through wireless signals, so that the water quality is well understood without going out. . In realistic aquaculture, portable and online instruments are the most widely chosen method for farmers or aquaculture companies. Portable instruments - portable instruments are ideal for use in patrol ponds. For example, the HQ30d portable multi-parameter water quality measuring instrument of the well-known company in the field of water quality testing, in the process of patrolling the pond, directly immersing the probe into the water, can understand the water temperature, pH, dissolved oxygen and other data, avoiding the kit. The inaccuracy also avoids the influence of various parameters on the process of taking the water sample into the laboratory. In the past, instrument operation and maintenance were relatively complicated, and the technical requirements have always been a hindrance to the use of instruments in the aquaculture industry. With the development of instrument technology, maintenance has become less and less, and the use has become more and more "stupid". Farmers can easily operate and use these instruments to patrol the pond and detect water quality, which undoubtedly greatly reduces the work of the patrol pond. The quantity and the improved quality of the patrol pond lay the foundation for ensuring the health of water quality and improving the quality and output of aquatic products. Online instrumentation - For large-scale farmers, the patrol pond is a large workload, and the electricity consumption of the aerator is also a huge expense. If there is water quality change affecting the production of aquatic products and even increasing the risk of death, culture The loss of the household will be huge. Online instruments have their outstanding advantages in this regard. Place the on-line probe (such as pH, dissolved oxygen) in a selected location in a pond (natural pond or factory farming workshop), transmit the probe signal to the control room via the network or transmit it to the mobile terminal via wireless signal, and increase The oxygen machine is connected to the same network. According to the set optimal dissolved oxygen value, the system automatically starts and stops the aerator. Under the condition of ensuring the best dissolved oxygen in the water, the energy cost of the aerator is the lowest, saving electricity and saving electricity. Increase production and quality of aquatic products. The use of online instruments has not occurred in the last year or two. Four or five years ago, companies tried to monitor water quality and control oxygenation online. However, there is a technical problem that has always restricted the effect of this method. That is, the former dissolved oxygen probe is a membrane electrode method, which requires frequent maintenance and relatively complicated maintenance, which is a huge obstacle to the aquaculture industry. If the maintenance is missing or improper, the measured value is not accurate, the control of the aerator is difficult to be accurate, and the value of the whole set of equipment is greatly discounted. Now, the development of technology has made this obstacle no longer exist. Taking the HBO dissolved oxygen probe LDOII AQ as an example, the fluorescence dissolving oxygen technology is adopted. This technology greatly reduces the maintenance amount, stabilizes the data, and can accurately realize automatic monitoring and automatic control of oxygenation. Beijing Jiuzhou Space Science & Trade Co., Ltd. specializes in the production and sales of online dust noise automatic monitor, tubular soil moisture temperature monitor / multi-layer soil monitoring system, mobile automatic runoff observation system, online soil erosion monitor, portable surface slope runoff automatic Monitor, small basin automatic sediment monitor, small diameter flow sediment automatic monitor, steel ruler water level gauge, automatic rainfall station, portable flow meter, portable weather station, soil nutrient speed meter, gas sampling cylinder, lubricating oil level III Filter barrels and other products, welcome new and old customers to come to consult
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