Bacillus velezensis, and micro-ecological preparation and preparation method thereof

Abstract

The invention relates to a Bacillus velezensis, and a micro-ecological preparation and preparation method thereof. The Bacillus velezensis is preserved in China Center for Type Culture Collection, hasa strain preservation number of CCTCC NO: M 2019218, and is classified and named as Bacillus velezensis BvL03, and the Latin academic name is Bacillus velezensis BvL03. The micro-ecological preparation suitable for aquiculture prepared by the strain has broad-spectrum effect of inhibiting fish pathogenic bacteria through drug-delivery routes such as feed addition, water body sprinkling or intraperitoneal injection, and the protection rate reaches 85 percent. After acting on fish bodies, the preparation can effectively prevent fish pathogenic bacteria such as aeromonas hydrophila from infecting freshwater fishes such as grass carps and crucian carps, and particularly has the best protection effect on grass carps.

Description

technical field [0001] The invention relates to the field of microecological preparations, in particular to a strain of Bacillus velez, its probiotics and a preparation method thereof. Background technique [0002] In recent years, in the process of aquaculture, bacterial diseases have occurred frequently and spread widely. Among them, explosive hemorrhagic disease is the most harmful to fish. Once this disease breaks out, it will cause very serious economic losses. However, the prevention and treatment of bacterial diseases mainly relies on antibiotics and chemical drugs, but the methods and dosages used are unscientific, and there are also many hidden dangers, such as the emergence of mutant drug-resistant strains, the destruction of the ecological environment of water bodies, and disturbance of the intestinal tract of aquaculture animals. The ecological balance of microorganisms can cause hidden dangers in the safety of aquatic products and reduce the immunity of aquacul...

AI Technical Summary

Problems solved by technology

[0005] Although there have been many research reports on Bacillus velezensis as an important biocontrol bacterium and probiotic, and there are also research reports on the antagonism of pathogenic bacteria in seawater fish, but so far, it has not been seen Involving the research reports that the pathogenic bacteria of freshwater fish have an antagonistic effect; there is no report that it has a preventive effect on the disease of freshwater fish; similarly, there is no report that Bacillus Velez can be used to make bacterial agents or microecological preparations Reports on fish disease control

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