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Abstract Lake Mariut (Maryout, LM), area 17,000 acres (Fig 1.1) is a brackish water lentic ecosystem. Currently it is a remenant part of the ancestor Lake Maryotis, which extended as an elongated basin behind a coastal barrier or limestone ridge called Abosir Ridge separating the lake from the Mediterranean Sea (Fig 1.1). Its main basin, one of the four sub-basins, 6000 acres was a victim of uncontrolled urbanization appeared in its usage as a receptor for the agricultural drainage waters of both Alexandria and Bohaira Provinces and sewage and industrial wastewater effluents of Alexandria City along the last fifty years (1960). This has led to conversion of the main basin (LMMB) from best productive and fertile aquatic habitat in 1960s to the most polluted one not only among the other basins of LM but also among the other Egyptian lakes and lagoons (El-Hawary, 1960; Salah, 1960 and 1961; Wahby, 1961; Samaan, 1966; Aleem and Samaan, 1969 a and b; El-Zarka et al., 1970; Samaan and Aleem, 1972 a and b; Samaan and Abdallah, 1981; Saad et al., 1984; Aziz, 1987; Khalil et al., 2013, Shreadah et al., 2014 a and b, and 2015). |