As new findings emerged, several definitions of Probiotics have been proposed. Fulller gave a precise definition of probiotics which is still widely referred to, i.e., a live microbial feed supplement which beneficially affects the host animal by improving its intestinal balance.

There is an urgent need in aquaculture to develop microbial control strategies, since disease outbreaks are recognized as important constraints to aquaculture production and trade and since the development of antibiotic resistance has become a matter of growing concern. One of the alternatives to antimicrobials in disease control could be the use of probiotic bacteria as microbial control agents. The state of the art of probiotic research in the culture of fish, crustaceans, mollusks, and live food, with an evaluation of the results obtained so far. A new definition of probiotics, also applicable to aquatic environments, is proposed, and a detailed description is given of their possible modes of action, i.e., production of compounds that are inhibitory toward pathogens, competition with harmful microorganisms for nutrients and energy, competition with deleterious species for adhesion sites, enhancement of the immune response of the animal, improvement of water quality, and interaction with phytoplankton. A rationale is proposed for the multistep and multidisciplinary process required for the development of effective and safe probiotics for commercial application in aquaculture.

Disease control in aquaculture industry has been achieved by following different methods using traditional ways, synthetic chemicals and antibiotics. However, the use of such expensive chemotherapeutants for controlling diseases has been widely criticized for their negative impacts like accumulation of residues, development of drug resistance, immunos up pressants and reduced consumer preference for aqua products treated with antibiotics and traditional methods are ineffective against controlling new diseases in large aquaculture systems.

Disease outbreaks are being increasingly recognized as a significant constraint on aquaculture production and trade, affecting the economic development of the sector in many countries. For instance, disease is now considered to be the limiting factor in the shrimp culture subsector.

Accumulation of uneaten feed, excreta, dead plankton creates sludge on the pond bottom and turbid water above. Digestion of sludge by indigenous microorganisms is slow and takes dissolve oxygen away from the crop. In addition,there is a build up of ammonia, nitrates and other toxic inhibitory products. Therefore, to improve the aquatic environment there must be a reduction in accumulation of these substances. It is well known fact that chemical and physical methods are costly and are temporarily beneficial. The reduction of sludge is best possible by bioaugumentation of the exiting microorganisms through regular addition of biologically active seed cultures.

Therefore, alternative methods need to be developed to maintain a healthymicrobial environment in the aquaculture systems there by to maintain the health of the cultured organisms. Use of probiotics is one of such method that is gaining importance in controlling potential pathogens.

So far, conventional approaches, such as the use of disinfectants and antimicrobial drugs, have had limited success in the prevention or cure of aquatic disease. Furthermore, there is a growing concern about the use and, particularly, the abuse of antimicrobial drugs not only in human medicine and agriculture but also in aquaculture. The massive use of antimicrobials for disease control and growth promotion in animals Increases the selective pressure exerted on the microbial world and encourages the natural emergence of bacterial resistance

• It is a product of multi versatile powder Probiotic.
• It act as a good Bioremediant for aqua culture to create a good pond conditions for aqua animals.
• It contains benefited microbial populations that are release chemical substances that have a bactericidal or bacteriostatic effect on other microbial populations, which can alter interpopulation relationships by influencing the outcome of competition for chemicals or available energy. The presence of bacteria producing inhibitory substances in the intestine of the host, on its surface, or in its culture medium is thought to constitute a barrier against the proliferation of (opportunistic) pathogens.They claim to improve gut health by stabilizing gut flora being their effect reflected in a better overall health status, welfare and performance of the animals
• It acts as a source of nutrients and enzymatic contribution to digestion and also enhancement the immune response (the non-specific immune system can be stimulated)
• It contains the nitrifying bacteria it can helps to reducing the Ammonia Nitrate and Nitrites in the pond water
• It contains the benefited microbes that are Influence on water quality; Improved water quality has especially been associated with Bacillus sp. The rationale is that gram-positive bacteria are better converters of organic matter back to CO2 that gram-negative bacteria. During the production cycle, high levels of gram-positive bacteria can be minimizing the build-up of dissolved and particulate organic carbon.
• It create a good environment for aqua animals for their healthy growth and reproduction.

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