الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
The Egyptian northern Nile-Delta lakes adjacent to the Mediterranean Sea are the principal depository for Nile Drainage and wastes before its outflow in the Sea (1). These include Lake Edku, Lake Borollus, Lake Manzala, and Lake Mariut. These Lakes are situated on the Mediterranean Coast of the Delta and cover about 6% of the non-desert surface area of Egypt. These Lakes are an important natural resource for agricultural crops and fish production in Egypt (2). Until 1991, these Lakes have always contributed more than 40% of the country’s total agriculture and fish production, but at present this has decreased to less than 12.22% (3). These lakes receive the agricultural Drainage water and major inputs of municipal and industrial wastes from cities as Cairo, Alexandria and others, in addition to several towns and villages (1). Lake Mariut is one of four shallow lakes in the northern Nile Delta of Egypt. It is the smallest and most polluted of these Lakes, and it is the only one that does not currently have a natural connection to the Mediterranean Sea. It is situated southeast of the city of Alexandria (4). It is found that, Lake Mariut is rich by nutrients, and has been rated as one of the most productive lakes in the world (5), so that Lake Mariut is considered as a highly eutrophic lake which sustains a rich flora of phytoplankton (6, 7).