The pH value of three indicators in aquaculture water body

PH value (i.e. pH) is an important indicator of water quality. In the breeding water body, the pH value directly reflects the change of water quality, such as the vitality of algae, the existence state of carbon dioxide, etc. whether it is within the normal range can be inferred from the size and daily change of pH value. PH value is also an important indicator affecting the growth of shrimp. In the early stage of breeding, especially when releasing seedlings, if the pH value is too high, the shrimp seedlings put into the pond will be very difficult or unable to molt, affecting the normal growth rate of shrimp seedlings. In the middle and late stage of aquaculture, especially in the high-level pool of high-density aquaculture, due to the high content of organic matter, the algae in the water are seriously aged. If the pH value is too low, the shrimp molting time will be prolonged. After molting, the new shell will take a long time to return to normal. The longer the recovery time is, the more dangerous the shrimp will be. During this period of time, the stolen death will occur, and whichever shrimp is big will die. Besides, in this eutrophic water body, it is easy to suffer from hypoxia or hypoxia. At this time, soft shelled shrimp are easy to be attacked by bacteria and viruses and have various diseases.

There are many methods for measuring pH value, among which the reagent method is simple and easy to understand, and is widely used in aquaculture production. So what should we pay attention to when measuring pH value? What kind of measurement results are useful? As the breeding water body is a whole composed of plankton, bacteria, organic matter, inorganic matter, breeding objects, etc., life activities are always going on, and the water quality indicators are also changing. The pH value of normal water body has a certain law: generally, the pH value of water body is low in the morning. With the strengthening of light, the pH value will rise with the increase of photosynthesis, and it will not begin to decline until the afternoon, and the pH value will reach the lowest in the next morning. Generally, we should pay attention to two points when measuring pH value. First, we should measure it regularly, twice a day, at 6-7 a.m. and 3-4 p.m., and make records. There is a certain difference between the two measured pH values, which reflects the vitality of plankton and the intensity of photosynthesis in the breeding water. If the change value of pH value is relatively small, it indicates that the algae are aging or dead, and the photosynthesis is weak. Xu immediately takes measures to deal with the water body to avoid breeding accidents such as hypoxia.

PH value is so important in the breeding process. If the pH value is low or high, how to deal with it? Here are some tips for your reference. First, when the pH value is too low, it is easy for you to think of using lime or changing water. Using lime and changing water can effectively improve the pH value, but these two methods are not always feasible and sometimes not very stable. Here is a relatively safe method: proper topdressing. The low pH value usually occurs in the middle and late stage of breeding. Due to the high content of organic matter and the low pH value caused by the aging of algae, the "bottom Juan" and "bottom oxygenation" are used to decompose and treat the excess organic matter, and then the amount of "algae Ansheng" is halved for topdressing until the pH value rises to the required level. The effect of lowering the water level in the deep-water breeding pool will be better, and topdressing can also prevent the anoxia problem in the middle and late stage of breeding; Second, when the pH value is high, everyone thinks it's not a big problem. If you want to reduce it, you also know the method of adding fresh water. Sometimes, it can't be completed because of the restrictions of conditions. Generally, high pH value occurs in the early stage of breeding because of active photosynthesis of algae in fertile water and low content of organic matter. Adding fresh water is one of the good methods. The other method is to provide some carbohydrates to the water body, such as "active carbon", which is an excellent material to reduce the pH value. Generally, it is 2-3 Jin / mu. Use it 1-2 times to reduce the pH value to the ideal value, and then use "probiotics" to stabilize the water quality.

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