الفهرس 
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Abstract
The studies which made on the free living marine Protozoa in the Egyptian waters, specially in the Suez Canal are low comparing to the studies which done in the freshwaters, or those which done on the zooplankton.
Protozoa has important value in the food chain, as it is an important food item for zooplankton and some fish larvae because of its richness in protein and aminic acids.
Pollution considered a very important problem in the industrial societies, so the need for simple and rapid experiments is necessary to study the effect of pollutant on the zooplankton and phytoplankton.
Protozoa were chosen for these experiments because it has rapid reproduction rates and their hfe cycles are short (may be few hours).
The study sites were chosen on the western side of the Great Bitter Lake in
the Suez Canal, these sites are exposed to pollution sources from the sewage and agriculture drainage.
The lake considered one of the old lakes of the Suez Canal, it was found before the digging of the canal itself. The Great Bitter Lake is about 24-Km long and 13-Km width, with maximum depth of about 20-m.
The Lake contains the largest quantity of the canal’s water.
It has a unique situation like the high salinity as a result of the salt domes on the floor, and the high evaporation rate.
Beside, there is no entrance of freshwater except through the agricultural drainage and the sewage product.