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How to play the role of bacillus in purifying aquaculture environment?

0 Author 2020-07-02 17:08:15

In aquaculture, microecological environment plays an important role in the decomposition and transformation of excrement and residual bait of aquaculture animals and the regulation of water quality factors. Whether it is normal or not determines the quality of water, thus affecting the health of aquatic animals. Bacillus has attracted more and more attention in its research and application due to its advantages of good stability, strong stress resistance and high survival rate.


  1. The action principle of bacillus on water purification


The use of Bacillus purified water microorganisms enables the breeders to remove waste left at the bottom of the aquaculture waters for a long time without interrupting the breeding process, especially the large amount of residual bait accumulated at the bottom of the old shrimp pond, excrete waste, animal and plant residues and harmful gases (ammonia, hydrogen sulfide, etc.) to decompose them into small molecules (peptides, advanced fatty acids, etc.). It is then decomposed into more small molecule organic matter (amino acid, low-level fatty acid, monosaccharide, cyclic hydrocarbon, etc.), and finally decomposed into carbon dioxide, nitrate, sulfate, etc., which effectively reduces COD and BOD in water, the concentration of NH +-N, NO2--N and sulfide in the water body is reduced, thus effectively improving the water quality.

At the same time, it can also provide nutrients for plankton mainly composed of single-cell algae and promote reproduction. The photosynthesis of these plankton also provides oxygen for the respiration and organic decomposition of benthic aquatic animals in the pool, thus forming a virtuous ecological cycle. Due to the mass reproduction of Bacillus, the dominant population is formed in the pool, which can inhibit the reproduction of pathogenic microorganisms and reduce the occurrence of diseases.


  1. Effect of bacillus on aquatic ecosystem


Decarburization function:Bacillus has abundant protease, lipase, amylase, cellulose, dehydrogenase, decarboxylase, oxidative enzyme and so on, which can strongly decompose carbon pollutants, proteins and complex polysaccharides, it also plays an important role in the decomposition of water-soluble organic matter.
Bacillus can decompose suspended solids and bottom mud through its enzyme, thus maintaining the balance of aquatic ecological environment. Putting bacillus (concentration of bacteria solution ≥ 1010/g) into the breeding pond can reduce COD and BOD in water and effectively improve water quality and surrounding environment.

Function of removing nitrogen and sulfur:Excessive discharge of N and P into the water causes the eutrophia of the pond. In the pond, it is also easy to form nh4-n and H2S which are toxic to aquatic animals, affecting the growth of animals and even dying. Bacillus can use its rich enzymes to strongly decompose nitrogen and sulfur pollutants and purify the aquaculture water.


Decomposition sludge:Using Bacillus preparation to improve the bottom material application experimental results show that organic carbon does not appear accumulation, Bacillus degradation of organic carbon effect is significant; Total nitrogen accumulation phenomenon, the difference between treatment group and experimental group is not significant; the carbon-nitrogen ratio showed a downward trend in the bottom.


Flocculation effect:Bacillus has good flocculation effect, and the flocculation effect of composite Bacillus strain is better than that of single Bacillus strain.


Nitrification:NO 3-under the action of Bacillus, NO2-,NO, n-2 are reduced to N2, that is, Bacillus is aerobic bacterium and facultative anaerobic bacterium, taking molecular oxygen as carrier, in the time and space of insufficient oxygen supply, nitrate can be used to generate NO2--N and N2 for the final electron carrier, which can play the role of denitrification and remove nitrate out of the system to improve pH.


  1. Application efficacy of Bacillus subtilis in feed addition


Maintain intestinal ecological balance:Promote the growth of beneficial anaerobic bacteria in intestinal tract, reduce the number of Escherichia coli, Vibrio and bacillosis, enhance anti-stress ability and reduce the occurrence of diseases.


Promoting growth:It can produce organic acids, various enzymes (amylase, lipase, protease, etc.), B vitamins, promote digestion and absorption, and improve feed conversion rate.


Regulating immunity:Stimulate the growth and development of animal immune organs, enhance disease resistance and improve survival rate, which can replace or reduce the use of antibiotics and prevent the generation of drug-resistant bacteria.


Optimize the breeding environment:Decompose animal residues, degrade feces and slurry, and eliminate odor; Reduce the concentration of harmful gases in the House, reduce the emission of pathogenic bacteria, and significantly purify the water quality and environment.

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