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Heavy metals are natural elements present in the environment (Wegwu et al., 2010). They are usually present in trace amounts in natural waters but many of them are toxic even at very low concentrations (Herawati et al., 2000). The accumulation of metals in an aquatic environment has a direct impact on the sustainability of the ecosystem. The bioavailability of any particular metal in the aquatic organisms or fish that are being ARTICLE INFO ABSTRACT Article History: Received: March 1, 2020 Accepted: March28, 2020 Online: April 1, 2020

egyptian journal of aquatic biology and fisheries

Assessment of metallothionein expression in Biomphalaria alexandrina snails and Oreochromis niloticus Fish as a biomarker for water pollution with heavy metals.