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Water pollution occurs when unwanted substances enter the water and affect water quality (Alrumman et al., 2016) that harm the environment and human health (Briggs, 2003). Such phenomenon is due to domestic and industrial wastewater leaping from water tank leaks, the ocean dumping of radioactive wastes and atmospheric deposition (Khan et al., 2013). In Egypt, 20% of the white animal protein production depends on fish. The most common farmed fish species is Oreochromis niloticus (Elgohary et al., 2020), among ARTICLE INFO ABSTRACT Article History: Received: Nov. 8, 2021 Accepted: Dec. 30, 2020 Online: Feb. 22, 2021

Ecological, Hematological and Parasitological Studies on Oreochromis niloticus Linnaeus 1757 in the Nile Delta Region, Egypt