How to use microecological agents correctly in the process of ecological crab culture?

Practice has proved that the use of microecological agents in the whole process of crab culture has obvious effects on improving the ecological environment of crab ponds, regulating water quality, improving crab immunity, preventing diseases and promoting growth.

(1) Types of microecological agents

According to the strains, microecological agents can be roughly divided into four categories: lactic acid bacteria, yeast, Bacillus and photosynthetic bacteria. These fungi have been proved to be beneficial and harmless to breeding animals and water environment, so they are also collectively called probiotics. These probiotics have their own characteristics, such as photosynthetic bacteria, which can directly absorb and utilize small molecules such as ammonia nitrogen and hydrogen sulfide in water as their own nutrition, and are rich in nutrients such as protein, which can be absorbed and utilized by cultured animals, but cannot utilize macromolecular organic substances such as animal excrement, residual bait and biological residue; Yeast has obvious effect on alleviating the symptoms of anorexia and indigestion in animals. At present, there are many kinds of microecological agents on the market, including dozens or even hundreds. When buying, farmers must carefully read the main strains marked on the label, the main mechanism of action after putting them in water or mixing them with bait, and use them in a targeted manner.

(2) the use of microecological agents

Microecological agents can be used in crab culture all year round, and the effect is better in summer, whether in the seedling stage or the adult stage. The main reason is the increase in the number of cultured animals such as river crabs in ponds in summer, which increases animal excrement, residual bait and aquatic plant death, which brings hidden dangers to the balance of water supply and ecological environment. The use of microecological agents can effectively decompose toxic and harmful substances in water, maintain the balance of water ecological environment and ensure that cultured animals suffer from less or no diseases. In the process of crab culture, the following points should be paid attention to when using microecological agents from April to September. First, the preparation put into the pond will naturally die out after a period of time, so it should be used regularly in the process of breeding, generally about 10 day 1 time, and it is best to activate the culture before and after use; Second, do not change a lot of water within 3 ~ 5 days after use, so as to avoid the loss of these strains with the change of water; Third, it is generally best to use it at noon on a sunny day; Fourthly, if disinfection and sterilization drugs are used in the pond, microecological agents can only be used after the efficacy disappears; Fifth, microecological agents can not replace drugs to treat diseases, but can only purify water quality, improve the ecological environment of water, promote growth and improve the body's immunity.

(3) Defects of microecological agents

① Under the condition of natural culture, there are many factors that affect the use effect of microecological preparations, such as weather, water temperature, water quality, water fertility, culture types, etc., and the use effect is very different.

② At present, the quality of microecological preparations is unstable, the detection methods are chaotic, and there is no unified national standard. Therefore, farmers had better choose the brand products of big manufacturers.

③ Microecological preparations should be stored in the dark at low temperature, generally at 5 ~ 65438 05℃. If this storage condition is not met, the bacterial content of the product will not reach the content indicated on the commodity label, and will continue to decrease with the extension of storage time. Therefore, it is best to buy products with a shorter factory time, and buy them now, and try not to store them at home for a long time.

④ Some strains multiply after being put into water, which will consume oxygen quickly. Therefore, it is best to open micropores or use oxygenator to avoid hypoxia in the crab pond.