Bacillus velezensis D1 with function of efficiently degrading feed starches in aquaculture water body and application of bacillus velezensis D1

Abstract

The invention discloses bacillus velezensis D1 with a function of efficiently degrading feed starches in an aquaculture water body and application of the bacillus velezensis D1. The preservation number of the bacillus velezensis D1 is GDMCC No:60943. The bacillus velezensis D1 disclosed by the invention is separated from intestinal tracts of prawns selves, and verification shows that the bacteriumis capable of extracellularly secreting amylase, and is capable of promoting digestion and absorption of starches and polysaccharides in feeds by bred animals after being immobilized in intestinal tracks of the bred animals. Gnotobiotic experiments of the bacterium with artemia show that the strain is free of stress or toxic effect on the bred animals even in a high concentration. The bacillus velezensis D1 grows optimally when the temperature is 25 DEG C, the primary pH value is 5.0 and the salinity is 2%; after the bacillus velezensis D1 is inoculated in a breeding water body, water qualitycan be stable, breeding targets grow healthily, and the bacterium is good in adaptability, high in security and environmentally friendly, can be used as a novel micro-ecological preparation for developing sustainable seawater breeding modes of green breeding, and has good application prospects.

Description

technical field [0001] The invention relates to the technical field of microbes, in particular to a strain of Bacillus Velez D1 capable of efficiently degrading feed starch in aquaculture water and an application thereof. Background technique [0002] As a popular seafood, Litopenaeus vannamei has extremely high nutritional value; China's shrimp farming industry has a huge scale, which has a major impact on the economic development of a region and the promotion of other industries. At present, my country is one of the world's important producers and exporters of aquatic products, and the output of prawns is still increasing year by year. According to the data of "China Fishery Statistical Yearbook 2019", the output of mariculture of prawns in China reached 55,800 tons in 2018. With the expansion of aquaculture scale and the improvement of aquaculture density, problems such as disease outbreaks and environmental pollution have become increasingly serious, resulting in huge ec...

AI Technical Summary

Problems solved by technology

With the expansion of aquaculture scale and the improvement of aquaculture density, problems such as disease outbreaks and environmental pollution have become increasingly serious, and huge economic losses have greatly hindered the development of aquaculture.

Nowadays, intensive aquaculture systems are becoming more and more popular. In order to pursue production and economic benefits, inexperienced farmers often overfeed feed. Amino acid balance in the feed and other methods are used to increase the feed intake of farmed animals, but the intestinal tract of farmed animals is short, the residence time of the feed in the digestive tract is very limited, and the digestion efficiency is low, and most of the feed is completely excreted without digestion In vitro, it leads to the accumulation of a large number of residual baits, serious endogenous pollution in ponds, and large-scale aquaculture wastewater discharge pollution has always been a negative factor restricting the development of environmentally friendly

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