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Abstract
Fifty (50) Nile tilapia (Orechromis niloticus) and 50 Common carp (Cyprinus carpio) were screened for Lactic acid bacteria (LAB) using specific media. The Antibacterial activity of LAB was estimated against pathogenic bacteria (Aeromonas cavie and Pseudomonas fluorescence). The results indicated that the recovered LAB isolates from intestine of Nile tilapia and common carp were 13(26%) and 4(8%), respectively. The isolated species were Lactococcus lactis, lactobacillus animalis, lactobacillus plantarum, lactobacillus fermentum and lactobacillus raffino lactis recovered from Nile Tilapia intestine, whereas Lactococcus lactis, Lactobacillus animalis, Lactobacillus acidophilus were isolated from Common carp. LAB isolates had an antibacterial effect against Pseudomonas fluorescence and Aeromonas cavie.