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Article Type

Research Article

Subject Area

Aquatic Science

Corresponding Author

Corresponding author. E-mail: m_okbah@yahoo.com

Abstract

Lake Edku is one of the most important lakes in the northern Nile Delta of Egypt. Studying the physicochemical characteristics and nutrient salts is essential for assessing water quality. pH recorded values fell within internationally permitted limits; the temperature was suitable for the growth of fish and living organisms. Electrical conductivity indicates a source of fresh water; salinity indicates that the lake water is brackish; Total Dissolved Solids (TDS) refers to most of the fresh water in the lake. Solid particulate matter occurred within the permissible limits according to WHO, and DO, and some results exceeded the permissible limit. However, BOD5 didn't exceed the permissible limits. In addition, dissolved nutrients (nitrate, ammonium, nitrite, and phosphorus) didn't exceed the permissible limits. The seasonal and regional water quality index (WQI) ranged between good, fair, and poor water quality that was restricted to use for irrigation and industrial purposes. The water pollution index (WPI) fluctuated between impure rank and polluted rank during spring and between heavily polluted rank and polluted rank during summer. The N/P ratio indicates the prevalence of dissolved phosphorus in all parts of the lake. Eutrophication level: chlorophyll ranged between eutrophic and hypertrophic. Nitrates fluctuated between (Oligotrophic and Mesotrophic) and phosphates fluctuated between (Hypertrophic and Eutrophic).

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