probiotics for aquaculture

Probiotics, also known as probiotics, probiotics or living bacteria preparation, refers to maintain intestinal microecological balance of microorganisms and their metabolic products, its can be introduced into and through the digestive tract of engraftment in host, promote the intestinal beneficial microbial breeding, inhibit the growth of harmful microbes, regulating SuSheng intestinal flora balance, so as to improve the health of the host.

The effect of probiotics on the host belongs to the category of biological repair. Therefore, probiotics should meet the following conditions :(1) they must be harmless to the host, (2) after being ingested by the host, they can be implanted into the digestive tract and function, and (3) they must improve the resistance of the host in the experiment of artificial infection

1. The mechanism of probiotics

1, secretion: by secreting bacteriocin, extracellular enzymes and other substances, inhibit or kill harmful bacteria.

2. Competitive effect: inhibit the growth and reproduction of harmful bacteria by secreting inhibitory substances, competing nutrients, competing host colonization sites or by the principle of competitive exclusion;

3. Improve the immunity of aquatic animals: activate the body's humoral and cellular immune system to improve the immune capacity of the host by improving antibody level and macrophage activity

4, purification and improvement of water environment: through direct or indirect decomposition and use of organic substances in aquaculture water, reduce the content of ammonia, nitrite, inhibit the breeding of harmful bacteria, improve the water environment, promote the healthy growth of aquatic animals

2 Application of probiotics in Aquaculture Aquatic animals living in the water environment, their microbial composition is not only affected by their own internal factors, but also easily changed with the invasion of microorganisms from the external environment and food. In order to effectively prevent and control aquatic animal diseases, probiotics can be used to improve the living environment of aquatic animals, balance the composition of microbial community in the body, enhance the resistance of aquatic animals to pathogenic bacteria, and improve the success rate of aquaculture

In the process of aquaculture, probiotics are often used as growth promoters, immune promoters, therapeutic agents and water quality improvers for practical application. According to different species of bacteria, the commonly used probiotics include photosynthetic bacteria, bacillus, lactic acid bacteria, yeast, bdellovibrio and nitrifying bacteria