الفهرس 
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Abstract
The main target of this work is to estimate the eutrophication status
and how At is related to the physico-chemical conditions, phytoplankton
community structure, including spatial and monthly distribution,
chlorophyll-g biomass and diversity of community in the area of behind
Kayet Bey to El-Silsila region. Also this work comprised laboratory
culture experiments of some planktonic species (Navicula cryptocephala
Kutz. and Melosira varians Ag.) isolated from the area of investigation to
study, the effect of sewage water and some of its individual components
(nutritive elements) on the growth of the two organisms.
The investigated area located at the western part of Alexandria
coastal waters extends from the eastern part to El-Silsila region about
(12km2), it includes the main sewer of Kayet Bey which discharges
minimally treated wastewater (93 MLD) directly to the sea through a 700
meter sea outfall discharge, also it comprises discharged minimally
treated wastewater off El-Silsila (58 MLDAnother source of water pollution is caused by the fishing boats.