الفهرس 
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Abstract
The excessive algal growth to the aquatic ecosystems at North Delta region is a common phenomenon, and its occurrence is a function of the environmental conditions and the resource requirements of the algae. The results were obtained revealed that the physicochemical properties of water samples showed remarkable local variations, while, physicochemical characters of soil sediment showed remarkable local variations and very limited seasonal variations, which led to the appearance of certain algal species at each location of the studied area throughout the investigation period. The most common algae were Chlorella, Cladophora, Ulva, Spirulina and Oscillatoria. Changes in the standing crop of algal organisms are governed by the seasonal variations as well as man made effect. The data obtained from the biochemical and biocontrol analyses revealed the ability of these natural resources to exploit in agricultural as biofertilizer or as animal fodder or as biocontrol agent, thus to avoid the problems resulted from this phenomenon.