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The role of pH value in aquaculture water
Views : 1605
Author : Ena
Update time : 2021-12-23 15:18:06
Water is the living environment of fish, and its ph is the main index of fish pond water quality, which directly or indirectly affects the growth, development, reproduction and disease of fish. Fish are most suitable to grow in neutral or slightly alkaline water, that is, the pH value is 6.5-8.5. The most suitable pH value for fish growth is 7.8-8.5, which is still within the safe range when the pH value is 6-9. If the pH is below 6 or above 9, it has an adverse effect on fish.
PH value is a comprehensive index of aquaculture water body, the normal daily pH value in the pond range of 1-2, too high, too low or change range is too large, will affect the growth of aquatic organisms. In the process of fish breeding, the pH value is too high or too low, which will not only cause changes in the content of some chemical substances in the water, but even turn the chemical substances into toxic substances, which will be adverse to the growth of fish and the reproduction of plankton, but also inhibit photosynthesis, affect the dissolved oxygen in the water and prevent fish breathing.
1, the role of pH value
Practice has proved that fish in acidic (pH value below 5.5) conditions, fish in water are particularly sensitive to fish diseases, breathing difficulties, even if there is no hypoxia in water, but also low digestibility to feed, slow growth. In acidic environment, the water solubility of phosphate affected, organic matter decomposition rate is slow, slow material circulation, make the breed of bacteria and algae, plankton, and gill can make the fish blood acid increased from corrosion, reduce the ability of carrying oxygen, despite the high oxygen content in water, the fish are still floating head, cause anoxia, the activity of the fish, The metabolism slows down sharply, the food intake decreases, the digestion ability decreases, is not conducive to the growth and development of fish.
At the same time, the more acidic water will lead to the occurrence of a large number of fish diseases caused by protozoa, such as ciliatosis. PH value between 5-6.5, and easily lead to a large number of dinoflagellate reproduction, the harm to fish is also greater. At low pH, the concentration of Fe2+ ions and hydrogen sulfide (H2S) will increase, and the toxicity of these components and low pH have synergistic effect, the lower the pH, the greater the toxicity.
In the nitrogen cycle, pH value also plays an important role, and weak alkaline pH value of 7.5-8.5 is the best for nitrification and nitrogen fixation. A high pH increases the toxicity of ammonia. PH also indirectly affects fish growth by affecting other environmental factors. PH also seriously affects the biological productivity of water bodies. An inappropriate pH can disrupt the supply of phosphates and inorganic nitrogen compounds, the most important material base for water production. If the alkaline pond water will form insoluble calcium phosphate, and the acidic pond water will form insoluble iron phosphate and aluminum phosphate, which will reduce the fertilizer efficiency, and it is not easy to get fat when cultivating water, it may be because of the acidic water.
2. Carbon dioxide, the determinant of pH
The pH value is determined by many factors, but the most important are the equilibrium system of free carbon dioxide (CO2) and carbonate ions (CO32-) in the water, as well as the content of organic matter in the water and its decomposition conditions. The equilibrium system of carbon dioxide and carbonate ions varies according to the hardness of water and the increase or decrease of carbon dioxide, which is determined by the relative strength of respiration, oxidation of organic matter and photosynthesis of plants in water.
3. Change rule of pH value
Under normal circumstances, when the sun comes out, the pH value gradually rises to the maximum value at about 17:30 in the afternoon, and then begins to decline until it reaches the minimum value before the sun comes out the next day, and so on and so on. The daily variation range of pH value is 1.0-2.0. If it goes beyond this range, the water body will have abnormal conditions.
The diurnal variation of pH value is because phytoplankton need to absorb carbon dioxide (CO2) for photosynthesis, which causes the change of carbon dioxide (CO2) in water, and the level of carbon dioxide (CO2) content affects the diurnal variation of pH value. It is of great guiding significance and utilization value to master the diurnal variation of pH value for breeding management.
PH value can be used as a standard for judging water quality: If you see a fish farming water pH value is low, there is no special external pollution, can determine the water hardness is low, likely humus, too much carbon dioxide (CO2) on the high side and dissolved oxygen, at the same time can also judge the tepid water plant photosynthesis or breed biological density is too large or microbial metabolism is restrained, The metabolism of whole material and system is slow. If the pH is too high, it could also be a lack of hardness, as well as plants that reproduce too much, have too much photosynthesis or not enough humus in the water.
Aerator is a kind of machine which is often used in fishery. Its main role is to increase the oxygen content in the water to ensure that the fish in the water will not be hypoxic, but also inhibit the growth of anaerobic bacteria in the water, to prevent the deterioration of the water threatening the fish living environment. Aerator is generally by its own air pump into the water, in order to achieve the purpose of increasing oxygen content in the water, stable PH value
PH value is a comprehensive index of aquaculture water body, the normal daily pH value in the pond range of 1-2, too high, too low or change range is too large, will affect the growth of aquatic organisms. In the process of fish breeding, the pH value is too high or too low, which will not only cause changes in the content of some chemical substances in the water, but even turn the chemical substances into toxic substances, which will be adverse to the growth of fish and the reproduction of plankton, but also inhibit photosynthesis, affect the dissolved oxygen in the water and prevent fish breathing.
1, the role of pH value
Practice has proved that fish in acidic (pH value below 5.5) conditions, fish in water are particularly sensitive to fish diseases, breathing difficulties, even if there is no hypoxia in water, but also low digestibility to feed, slow growth. In acidic environment, the water solubility of phosphate affected, organic matter decomposition rate is slow, slow material circulation, make the breed of bacteria and algae, plankton, and gill can make the fish blood acid increased from corrosion, reduce the ability of carrying oxygen, despite the high oxygen content in water, the fish are still floating head, cause anoxia, the activity of the fish, The metabolism slows down sharply, the food intake decreases, the digestion ability decreases, is not conducive to the growth and development of fish.
At the same time, the more acidic water will lead to the occurrence of a large number of fish diseases caused by protozoa, such as ciliatosis. PH value between 5-6.5, and easily lead to a large number of dinoflagellate reproduction, the harm to fish is also greater. At low pH, the concentration of Fe2+ ions and hydrogen sulfide (H2S) will increase, and the toxicity of these components and low pH have synergistic effect, the lower the pH, the greater the toxicity.
In the nitrogen cycle, pH value also plays an important role, and weak alkaline pH value of 7.5-8.5 is the best for nitrification and nitrogen fixation. A high pH increases the toxicity of ammonia. PH also indirectly affects fish growth by affecting other environmental factors. PH also seriously affects the biological productivity of water bodies. An inappropriate pH can disrupt the supply of phosphates and inorganic nitrogen compounds, the most important material base for water production. If the alkaline pond water will form insoluble calcium phosphate, and the acidic pond water will form insoluble iron phosphate and aluminum phosphate, which will reduce the fertilizer efficiency, and it is not easy to get fat when cultivating water, it may be because of the acidic water.
2. Carbon dioxide, the determinant of pH
The pH value is determined by many factors, but the most important are the equilibrium system of free carbon dioxide (CO2) and carbonate ions (CO32-) in the water, as well as the content of organic matter in the water and its decomposition conditions. The equilibrium system of carbon dioxide and carbonate ions varies according to the hardness of water and the increase or decrease of carbon dioxide, which is determined by the relative strength of respiration, oxidation of organic matter and photosynthesis of plants in water.
3. Change rule of pH value
Under normal circumstances, when the sun comes out, the pH value gradually rises to the maximum value at about 17:30 in the afternoon, and then begins to decline until it reaches the minimum value before the sun comes out the next day, and so on and so on. The daily variation range of pH value is 1.0-2.0. If it goes beyond this range, the water body will have abnormal conditions.
The diurnal variation of pH value is because phytoplankton need to absorb carbon dioxide (CO2) for photosynthesis, which causes the change of carbon dioxide (CO2) in water, and the level of carbon dioxide (CO2) content affects the diurnal variation of pH value. It is of great guiding significance and utilization value to master the diurnal variation of pH value for breeding management.
PH value can be used as a standard for judging water quality: If you see a fish farming water pH value is low, there is no special external pollution, can determine the water hardness is low, likely humus, too much carbon dioxide (CO2) on the high side and dissolved oxygen, at the same time can also judge the tepid water plant photosynthesis or breed biological density is too large or microbial metabolism is restrained, The metabolism of whole material and system is slow. If the pH is too high, it could also be a lack of hardness, as well as plants that reproduce too much, have too much photosynthesis or not enough humus in the water.
Aerator is a kind of machine which is often used in fishery. Its main role is to increase the oxygen content in the water to ensure that the fish in the water will not be hypoxic, but also inhibit the growth of anaerobic bacteria in the water, to prevent the deterioration of the water threatening the fish living environment. Aerator is generally by its own air pump into the water, in order to achieve the purpose of increasing oxygen content in the water, stable PH value
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