What are the water quality management techniques in summer river crab culture? How to remedy water quality problems?

In the southern region, as a relatively concentrated area of river crab culture, water quality management is particularly important in the uninterrupted torrential rain and high temperature in summer. How to remedy the water quality problems?

1. Water quality management techniques in river crab culture in summer

1. Management of aquatic plants

The complex and changeable summer weather makes some ponds have serious phenomena such as rotten water plants, red water and black water, but you can't use medicine to solve it casually, because once the medication is not in the right way or the dosage is too large, it will produce a lot of side effects such as oxygen consumption and poisoning. increase crayfish casualties. At this time, it is recommended to alleviate the symptoms, because it is very difficult to solve the problem all at once, and the first task is to keep the river crab.

2. Prevent the spread of cyanobacteria

Cyanobacteria tend to multiply in large numbers from June to September. They like high temperature and strong light. If the temperature is high, they can reproduce quickly. However, no one can avoid this kind of hot weather, and it is impossible to think about the temperature change. In order to fundamentally control cyanobacteria, it is necessary to control nitrogen and phosphorus, that is, the nutrients needed by cyanobacteria. The best way to control the cyanobacteria outbreak is to prevent it, that is, to prevent fertilizers, animal waste and other nutrient-rich substances from entering the water as much as possible.

In order to prevent the flooding of cyanobacteria, first, when cleaning the pond, because there are a large number of "seeds" of cyanobacteria in the sediment, it is necessary to clear the silt and decompose it with microbial preparation; second, base fertilizer should be careful to use chemical fertilizer, especially less phosphate fertilizer, and bio-organic fertilizer with more nitrogen and less phosphorus should be used as base fertilizer; in the middle and later stages, full water-soluble fertilizer should be used, so that other algae, especially beneficial algae, can reproduce. Third, the water level of aquaculture is not easy to be too deep, and a wheeled aerator is used to increase oxygen on the pond side to cultivate Chlorella and reduce the occurrence conditions of cyanobacteria reproduction; fourth, in the high temperature season, reasonable feeding should be carried out properly or cut off 2MUR 3 times a week.

Second, how to remedy the water quality problems

1. Cyanobacteria problem

First of all, cyanobacteria like the water with high nitrogen and phosphorus, which is mainly nourished by nitrogen and phosphorus in the pond. Farmers can choose beneficial microorganisms such as photosynthetic bacteria and Bacillus, which, like cyanobacteria, survive by absorbing nitrogen and phosphorus. By sprinkling these microbial agents into the pond, you can rely on them to grab the nutrients of cyanobacteria, thus controlling the decline in the number of cyanobacteria.

Secondly, the river crab itself is the maker of nitrogen and phosphorus, and their feces can be decomposed into nitrogen and phosphorus. Long-term addition of microbial preparations to the feed can reduce the excretion of histamine, nitrogen and phosphorus into the pond water, thus achieving the purpose of reducing nitrogen and phosphorus, thus reducing the nutrient source of cyanobacteria.

2. The problem of anti-algae

Every day in the pond, there will be aging algae die, there are new algae growth replacement, this is a natural phenomenon, usually floating on the surface of the pond a layer of dead algae, in the shape of yellow floating matter. It is impossible to cure the problem of anti-algae, but it can be alleviated moderately.

First, when pouring algae, we should not only transfer water, but also pay attention to the bottom reform, and the more suitable bottom reform method is the bottom modification agent of potassium persulfate compound salt.

Second, pay attention to oxygenation, especially when the size or density of crayfish is larger, anti-stress and detoxification drugs are given at the same time.

Third, replenish fresh water and fertile ponds; but before fertilising ponds, we should first detect whether there are a large number of protozoa in the water, and if so, kill them first and then fertilize the ponds.

The changeable weather in summer is a severe test for the survival of river crabs and farmers, so special attention should be paid to the management of water quality. Ensuring healthy water quality is the basis of production and quality.