Probiotic can act as Anti Pathogenous Bacterial Agent....

1. Function of Probiotic...

Knowledge of probiotic has been increased, recently we know that probiotic can act as anti- pathogens bacterial agent. The following way they work....
- Modifying intestinal microbiota ( Microbiota: itself microorganism, make barrier for pathogenic bacteria)
-Secreting antibacterial substances like: Bacteriocine ( proteins), Enzymes ( Proteases) and organic acid.
- Fight for space and food necessary for pathogens bacteria
- Modulating immune system of fish

2. Gut probiotic...

 Including above 4 functions Gut probiotic has another function like
-  Improve/increase intestinal villous/projection which absorb nutrients transfer to blood cell and formation of tissue
- Normalize the intestinal pH (in high pH  different pathogenous bacteria
 E. coli, Salmonellae) formed .

 3. Function of Red yeast...

Yeast ( saccharomyces ) is fungi. Red yeast has several function
-  Pigmentation ( coloring) of fish muscles cell
- Strong defense system
- improve liver function 

4. Function of Antioxidant:  
Antioxidants are compounds that inhibit oxidation. Oxidation is a chemical reaction that can produce free radicals, that may damage the cells of organisms. Antioxidants like- Ascorbic acid and Malic acid stop free radicals production.