Effect of different sources and levels of some dietary biological additives on: IV-immunity and haematology of Nile Tilapia, Oreochromis niloticus

This study aimed to investigate the effect of dietary graded levels of three pre-and probiotics on the immunity and haematology of all-males mono-sex Nile tilapia fish. The experimental period was 16 weeks after 2 weeks adaptation period. In the pathogenicity test, dietary inclusion of Aqua Superzyme at 0.01% of the diet, Garlen Allicin at 0.01% of the diet, and Diamond V (XPC) at 0.5% of the diet, generally reduced the mortality rate (%) and therefore increased the survival rate (%). Yet, the only significant (P 0.05) positive effect was due to Aqua Superzyme at 0.01% of the diet in general and after 48h whereas the other supplements did not significantly (P 0.05) affect the pathogenicity. The comparisons among substances and their levels clear that the best survival was occurred in the treatment 1:1, i.e the fish group fed Aqua Superzyme (at 0.01% of the diet) diet. The haematological parameters values increased significantly (P 0.05) by using Aqua Superzyme, particularly at 0.01% of the diet; Garlen Allicin, particularly at 0.01% of the diet; and Diamond V (Original XPC), particularly at 0.4% of the diet). Yet, the overall significantly (P 0.05) best valus for all tested parameters among additives and their levels was that contained Aqua Superzyme at 0.02% of the diet. So, it is recommended to supply Nile tilapia s diet with the prebiotic Aqua Superzyme at 0.01-0.02% of the diet to improve the immunity system of the fish.