A preliminary study (120 days) was conducted on African catfish (initial body weight 90 g) to evaluate the beneficial effects of a new patent local probiotic (T-Protphyt 2000) when added to their diet (25% crude protein) at graded levels (0, 1, 2 and 3 g kg-1 diet). The diet containing 1 g kg-1 (T2) reflected the best growth and feed utilization parameters. Increasing the probiotic level increased fish carcass protein, fat and energy contents, as well as RBCs, WBCs, platelets and A/G ratio but decreased blood proteins. Also, T2 treatment led to improvement of most histometric characteristics of the dorsal muscles of African catfish compared with the control (T1) and other treatments (T3 and T4). The bacterial activity of this probiotic was tested in vitro against nine of pathogenic strains of Gram-negative bacteria (Aeromonas hydrophilla, Pseudomonas aeruginose, Pseudomonas fluorescent, Vibrio sp., Klebsiella sp., Shigella sp., Salmonella sp., Proteus sp. and Escherichia coli) at two concentrations (120 and 240 μg) compared with oxytetracycline (OTC 30 and 60 μg). The results showed positive effect of the probiotic at the two concentrations against all the tested bacteria.
A.M. Abdelhamid, A.I. Mehrim, M.I. El-Barbary, S.M. Ibrahim and A.I. Abd El-Wahab, 2009. Evaluation of a New Egyptian Probiotic by African Catfish Fingerlings. Journal of Environmental Science and Technology, 2: 133-145.