Bacteriological and Molecular Studies on Some Pathogenic Bacteria

Bacterial diseases are among the most important causes of losses among fish stock. A full understanding of the aetiological agent the pathogenesis biochemistry antigenicity and the inter-relationship of stress-related and environmental factors is essential for successful management and control. On the other hand Nile tilapia (Orechromis niloticus) is considered the most widely cultured freshwater fish in the world. It has been contributing to the world aquaculture since the ancient Egyptian days and remains a major freshwater fish species to be cultured.