Bacillus cereus NY5 capable of effectively inhibiting tilapia-source streptococcus agalactiae

Abstract

The invention relates to bacillus cereus NY5 capable of effectively inhibiting tilapia-source streptococcus agalactiae. The strain is preserved in the China General Microbiological Culture Collection Center (CGMCC) and the preservation number is CGMCC No.9372. The bacillus cereus is aerobic bacteria and can effectively inhibit growth of tilapia-source streptococcus agalactiae. Through a nitrate nitrogen experiment, removal efficiency can reach 100%. The strain also has functions of casein hydrolysate and starch and has passed safety detection. In a water body with concentration of bacillus cereus NY5 being 2*107cfu / ml and under the condition of injecting 100 microliters of a NY5 bacterium solution at the concentration of 2.1*106cfu / ml, no death or other abnormal phenomena happen to tilapia. According to the invention, a useful strain source is provided for effectively inhibiting growth of tilapia-source streptococcus agalactiae and efficiently degrading nitrite nitrogen, protolysate and starch under the aerobic condition, and the application range of bacillus cereus in the aspect of functions is widened. The bacillus cereus NY5 has high application value.

Description

technical field [0001] The invention belongs to the field of biotechnology, and in particular relates to a highly active bacillus cereus strain NY5 (Bacillus cereus). Background technique [0002] Tilapia belongs to the order Perciformes, the suborder Perciformes, the family Cichlidae, and the genus Tilapia. Because tilapia has the advantages of omnivorous, fast growth, strong fecundity and wide adaptability, it has become the main cultured fish in the world. my country is the world's largest producer and exporter of tilapia. In 2013, the output was 1.5 million tons, the processed volume was more than 300,000 tons, and the export value was more than 1 billion US dollars. However, since 2009, there have been frequent outbreaks of diseases in tilapia farming in my country, resulting in huge losses, which have seriously affected the sustainable development of the tilapia industry, the most serious of which is streptococcal disease. The disease has the characteristics of stron...

AI Technical Summary

Problems solved by technology

[0004] Sufficient supply of oxygen is one of the important conditions for intensive farming, and most of the traditional denitrifying bacteria are anaerobic bacteria, in the current farming environment, their denitrification performance must be limited

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