Why does aquaculture need to test water quality indicators
The aquaculture industry is closely related to the water quality, because the water quality is related to the fish growth environment. If the water quality environment is relatively bad, it may cause farmers to suffer major economic cost losses. For this reason, my country has also formulated relevant regulations. Aquaculture water quality testing standards, from this point we can see the importance of water quality to the aquaculture industry. Generally, in the large-scale aquaculture industry, it is necessary to use an aquaculture water quality online monitoring system to monitor real-time water quality. Reasons for testing water quality indicators in aquaculture 1. Increase or decrease of PH value: PH value is an important indicator for judging water quality. When the water quality is acidic, it will cause the blood PH value of fish to drop, which will reduce its oxygen carrying capacity and cause Hypoxia. Alkaline water quality will cause the gill tissue of fish to be corroded. And the absorption of nutrients by phytoplankton will also be affected by the pH value. Low pH will lead to hypoxia in plants, and high pH will hinder the absorption of iron, carbon and other elements by algae. In the normal range, the pH range of water quality is within 6.5-8.5, but only within the safe pH range. 2. Reduce dissolved oxygen During the continuous 24-hour monitoring process, the dissolved oxygen concentration in water should be kept greater than 5mg/L for more than 16 hours, and not less than 3mg/L at other times. If it is lower than this standard, fish will feed and digest. Cause a certain impact, dissolved oxygen less than 1mg/L for a long time will cause hypoxic reaction. Plankton in aquaculture also needs a large amount of dissolved oxygen. If the oxygen concentration is not enough, the 'flooding pond phenomenon' will occur. 3. Eutrophication: In the breeding industry, as the density increases and a large amount of feed is fed, a large amount of residual feed is formed in the water and animal excretion accumulates, resulting in an increase in the concentration of nitrogen, phosphorus and other substances. After exceeding a certain limit, eutrophication will form. Nutritization affects the physiological functions of aquaculture animals, and in severe cases leads to large-scale death of aquatic products. 4. Ammonia nitrogen and nitrite exceeding the standard Ammonia nitrogen and nitrite are produced through the decomposition of fish residues, excrement, biological corpses and bottom organic matter. When the concentration of ammonia nitrogen and nitrite exceeds the standard, it will lead to the survival and growth of aquatic products. In mild cases, it will lead to slow growth of aquaculture species, reduced food intake, decreased immunity and resistance, and invasion of pathogens. In severe cases, acute or chronic poisoning and death may occur. 5. After heavy metals exceed the standard, when the aquaculture water is polluted by heavy metals, the respiratory gills of fish will continuously absorb heavy metal elements in the water, forming heavy metal enrichment. Acute and chronic poisoning may occur after exposure to heavy metal fish. 6. Frequent fish diseases. Polluted water quality will form viruses, bacteria, fungi, parasites, etc., which will affect the normal growth of fish. Virus invasion will cause herpes virus disease, lymphocyst disease, and grass carp hemorrhagic disease in aquaculture species. wait. A large number of bacteria can easily cause bacterial gill rot, whitehead disease, red skin disease and so on. Fungi are difficult to kill and may cause saprolegniasis, gill mold and other diseases. Parasites can cause trichomoniasis, small melon worm disease, third generation worm disease and so on. Frequent fish diseases are mostly caused by water pollution, which can easily lead to infection and death of aquaculture species. Therefore, real-time monitoring of water quality is very necessary in the aquaculture industry, because the water quality changes at any time. If there is an abnormality, it should be resolved in time. This can play a role in real-time water quality by installing an aquaculture water quality online monitoring system. monitoring role.