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  • 技術共享
    Eight indicators aquaculture
    〖 12/20,2013 | onclick 1504 〗
    1) Ammonia: 
    Non-ionic ammonia (NH3) is the number one killer of aquatic animals invisible, aquaculture production should control the concentration of NH3 in 0.015ppm less, higher than 0.02ppm cause death. 
    Crab, shrimp nursery MH3 should be controlled at 0.01ppm less than 0.01ppm will cause death. 
    PH affect the toxicity of NH3, PH below 7 NH3 virtually non-toxic, more than 8.5% severe toxicity.

    2) Nitrite: 
    Nitrite is the source of aquatic animal pathogenic, nitrite toxicity is that it will destroy the red blood cells, so that the gradual loss of oxygen capacity of the blood, and to fish in the liver, spleen and kidney function is poor, resulting in fish physical deterioration, poor spirit, therefore susceptible to various diseases. This phenomenon as long as the content of nitrite concentration is higher than O.1 - 1.0ppm will produce, but Rengyi different species varies. 
    In addition, water hardness, will directly affect the toxicity of nitrite in water quality in higher hardness, nitrite toxicity will be reduced. 
    Aquaculture water nitrite chlorine should be controlled below 0.1ppm, 0.5ppm cause when death or illness. Higher than 0.8ppm will cause a large number of deaths. Crab, shrimp nursery water nitrite nitrogen should be controlled below 0.1ppm, 0.3ppm mild when killed and more than 0.5ppm will cause a lot of deaths. 
    Under normal circumstances, the value should be less than nitrite 0.20ppm, while shrimp crab nursery, the nitrate content of water in Central Asia must not be higher than 0.20ppm. 
    If the measured value represents the danger of 0.5-2.0ppm. If higher than 2ppm, this case is very dangerous. 
    Solution: analyze specific issues 
    Under water lean, the first application of fertilizer products should cultivate phytoplankton, consuming conversion of nitrite; under the late breeding, water quality deterioration, should choose complex type of probiotics, such as "nitrite g" degradation nitrite ; the conditional case, the amount of water changes

    3) Hydrogen sulfide: 
    Hydrogen sulfide is a highly toxic substance, a low concentration on the growth of shrimp, so that a high concentration of shrimp died. The concentration of hydrogen sulfide control in aquaculture water 0.1mg / L or less, the bottom should have more stinking mud and bait.

    4) DO: 
    Dissolved oxygen is not only to ensure that the shrimp can be normal and healthy growth Polytechnic students in essential substance, but also improve water quality and sediment necessary substances in shrimp farming should ensure that the whole process without sufficient oxygen, it is best kept at 5mg / L or more. Bottom water shrimp farming in South America in general should not be less than 3.5mg / L or more. When the dissolved oxygen dropped 1mg / L, there vannamei Floating risk of death; Chinese shrimp farming bottom water generally in a short time not less than 4mg / L. Pond sediment and plankton in water also consume a lot of oxygen, the data show, the night of shrimp consumed only 5% of dissolved oxygen in the pond, the pond sediment eliminate about 50% to 70%, plankton consumed about 20 % ~ 45%.

    5) PH value: 
    PH value is a comprehensive indicator of water quality, such as pH value increased water phytoplankton photosynthesis Description strong increase in dissolved oxygen; pH value is a major factor in causing changes in the chemical composition of water, such as lowering the pH value causes toxic hydrogen sulfide increases. So vannamei farming in the pH should be controlled at 7.7 to 9.2, Chinese shrimp farming should be controlled at a pH of 7.8 to 8.6 is appropriate.

    6) Chlorine 
    Aquaculture ponds mainly from chlorine disinfectants chlorine used. Chlorine for fish, algae phase equilibrium bacteria were seriously affected. So do not abuse disinfectant. 
    Aquaculture water quality should be maintained at 0.02ppm or less chlorine. Higher than 0.02ppm of chlorine can produce fish mucous strong corrosive effect than 0.1ppm make fish death. 
    1, under normal circumstances, the chlorine content should be less than 0.02ppm; 
    2, if the content is too high, should be more open aerator to improve dissolved oxygen in water to reduce the toxicity of chlorine.

    7) Total alkalinity: 
    Aquaculture, especially shrimp farming water quality conditions, total alkalinity plays a very important role. We often hear, shrimp nursery water and water to raise total alkalinity. In simple terms, the total alkalinity of the water is absorbed cations (e.g., hydrogen ions H +) to maintain the pH (pH) of the same capacity, i.e., the reaction is total alkalinity buffering capacity of water bodies. TBN is high, water quality due to external factors (such as rain) the magnitude of change caused by small, so-called "quality and stability." 
    Changes in water quality, aquatic animals must spend more energy to regulate osmotic pressure; quality and stability, especially in the farming of shrimp larvae in the breeding process of metamorphosis and growth would be more successful; develop the process, the immune system is more robust animal farming , responsive, normal physiological function and growth. Conversely, if the total alkalinity is small, water may suddenly changed, then farmed animals prone to strong stress response, resulting in disease-prone.

    8) Phosphate: 
    Like phosphate detergents can cause fish and other aquatic organisms anoxia.
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