Survey of contaminant bacteria on Oreochromis niloticus and lates niloticus at Elmourda fish market

Abstract

This study tend to determine the microbial load on fresh and chilled fish and to identify some contaminant bacteria. The fish were divided into two groups (one was put in a container and mixed with ice ratio 1:1, layer of ice and layer of fish for 48 hours. The second group was treated as fresh. Samples were taken from three regions of fish muscles; these are caudal, middle and anterior region. Finally, the whole samples were analyzed. The result obtained revealed that the bacterial count in fresh fish in Oreochromis niloticus and lates niloticus is 4.69×105±1.35×105 and 3.69×105±0.89×105 and in chilled fish of Oreochromis niloticus and lates niloticus is 5.65×105±1.88×105and 3.81×105 ±1.22×105cfu/g respectively. The result analyzed show that there was highly significant difference in total bacterial count (P < 0.05) between chilled Oreochromis niloticus and Lates niloticus while there was no significant difference between fresh Oreochromis niloticus and lates niloticus. In addition, the result indicates that Staphylococcus and E.coli were isolated as contaminant bacteria, while Salmonella was not isolated from both fresh and chilled Oreochromis niloticus and lates niloticus.