In this survey the impacts of the Emarat fish farm, with the capacity of production rate of ???????????? metric tones per annum, on the water quality of Gahar River from January ???????????????? to January ???????????????? was carried out. A total of ???? stations were selected. First station was located in ???? km before the Emarat Site and second one was located exactly in the inlet of the site and the third one located in the outlet of the complex and fourth one was located ????km after the site. The samples collected from all stations on monthly basis throughout the year and analyzed for their quality characteristics such as temperature, total hardness, calcium, magnesium, electrical conductivity, pH , phosphate, chlorine, BOD????, DO, TDS, TSS, SS, NTU. Due to the meaningful differences in the results at the levels of ???? to ????, it can be concluded that the Emarat affects ecological characteristics of the Gahar River.