A compound plant extract for inhibiting Edwardsiella tarda in water environment and its preparation method and application

Abstract

The invention belongs to the technical field of antibacterial agents for water environment, and discloses a compound plant extract for Edwardsiella tarda in water environment. The compound plant extract is mainly made of the following components in mass percentage: Extract 55%-65%, Portulaca oleracea extract 26%-35%, Jinbuchang stem extract 12%-18%. Compared with the safety of traditional GMP disinfectants, the compound plant extract of the present invention belongs to environment-friendly substances, and has a large safe concentration range for scaleless fish. When splashed with water, it has obvious inhibitory effect on Edwardsiella tarda, And it will not be disturbed by organic matter in the water body. When the dosage is ≤5mg / L, it can effectively inhibit the abnormal reproduction of Edwardsiella tarda in the upper, middle and bottom layers of the aquaculture water body, and it is effective against the yellow catfish, channel catfish and channel catfish. Security is good.

Description

technical field [0001] The invention relates to the technical field of antibacterial agents for water environment, and more specifically, relates to a compound plant extract for inhibiting Edwardsiella tarda in water environment and its preparation method and application. Background technique [0002] Edwardsiella tarda is a serious Gram-negative pathogen with a size of about 1-4 μm. It is facultatively anaerobic, does not form spores, and uses perinatal flagella as its motility organ. It is commonly found in the world. In freshwater and seawater environments, it can grow at 4-10°C, the optimum growth temperature is 25-32°C, it does not grow above 42°C, and the pH range is 5.5-9. It can grow in the range of 0-4% salt. [0003] Edwardsiella tarda has strong pathogenicity to eel, catfish, flounder, frog and other scale-free cultured species. It enters the fish body by adhering to the bait or invades the fish body through the digestive tract, gills or injured epidermis of the ...

AI Technical Summary

Problems solved by technology

In actual farming, in Guangdong, Hubei, Sichuan and other scale-free farming areas, a relatively common phenomenon is: when the water body temperature and organic matter and other conditions are suitable for the rapid propagation of E. tarda, E. tarda has a strong effect on channel catfish, channel catfish, catfish, The disease risk of yellow catfish is greatly increased. Once it enters the fish and causes disease, firstly, it will delay the effective feeding time, secondly, the cost of medicine will increase, and thirdly, the use of chemical medicine will lead to the risk of drug residue

[0004] By inhibiting the abnormal reproduction of Edwardsiella tarda in water bodies, thereby cutting off the risk of transmission of Edwardsiella tarda is one of the commonly used prevention and control methods. Commonly used disinfectants such as chlorine dioxide, povidone-iodine and potassium salts, although It has good safety and bactericidal ability, but it is easily affected by the content of organic matter in the water body. It is often difficult to achieve the bactericidal effect when using conventional doses when delayed Edwardsiella occurs. The total use cost of the 2-3 disinfection courses within is very high, which greatly reduces the willingness of farmers to use it; and in the research report based on the screening of different boiled Chinese herbal medicines for inhibiting Edwardsiella tarda, although it is clear that some boiled Chinese herbal medicines have inhibitory effects. Bacteria effect, but its relatively prominent problem is still too high dosage and corresponding use cost when converted into production application, and the value of conversion into production application is low

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