الفهرس 
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Abstract
Because of the economic importance of bivalves and their promising aquaculture development in Egypt, this study focused on types of bacteria that can cause diseases to this group of marine organisms represented by the national Gandofly (Tapes decussatus) grown in different marine environments in Egypt.
Bivalves feed by filtration of the surrounding water, which leads to the accumulation of large amounts of suspended pollutants including pathogenic microorganisms. These include a variety of bacterial strains such as those belonging to the genera Vibrio, Aeromonas, Staphylococcus, Salmonella, which represent potential threats to human, as well as other marine organisms that feed on bivalves. For improved public health protection and for secure assessment of bivalve fisheries ant their official approval, it is important to investigate the microbial pathogenic flora in such marine environments. In this research, clams samples were collected monthly (for one year) from six locations in three cities that represent bivalve fisheries in Egypt. These included Alexandria (EL-Max, El-Kashafah club and the area of National Institute of Oceanography and Fisheries), Damietta (Ezbet Elborg) and Ismailia (Temsah Lake in two different locations.