الفهرس 
acknowledgmentOnly 14 pages are availabe for public view
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Abstract
on the fringe of the Nile Delta and just adjacent to the Mediterranean Sea lie four large depressions of relativ protected brackish and shallow water bodies known as the northern Delta Lakes. These lakes were periodically flooded by the Nile water. Except for Lake Mariut, which is land-locked, these lakes are connected with the Mediterranean Sea through narrow termed Boughaz. They receive drainage water through agricultural drains as well as fresh water from the Nile. As a proximate reservoirs to the Nile and drain waters before they flow to the Mediterranean Sea, these lakes are the sit- es of the last Egyptian uses of Nile water. Such lagoons are of great economical importance to Egypt. The shallowness of these lakes and the rich food supply they contain render them excellent feeding and breeding grounds for many fish species. According to statistics of the Ministry of the total fish catch landed from these lakes constil- uted about of the total fish yield of the country. Tt has also been estimated that with improved fishing methods and fishery management practices, the fish yield from these lakes would be doubled. Up to fresh water and sediments were brought into the Delta lakes primarily by the Nile River. Since the comp