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The aim of this study was to investigate the effect of wastewater fish farms on planktonic communities of the Gar-Gar River. This study was carried out from seven stations at February to December (2014-2015), in Gar-Gar branch, Karoon river and wastewater farms. The most abundant phytoplankton class was Bacillariophyceae and the most dominant being cyclotella genus. The high presence of Cyanophyceae in the summer was characterized by high levels of organic material load on the Gar-Gar River and the relationship between phytoplankton diversity and pollution of the Gar-Gar River, which indicates the semi-polluted part of the river. The Palmer index evaluation shows exception station 1, other stations have an organic pollution. saprobic index of all stations also shows a moderate pollution with the origin of organic matter. There is no significant correlation between saprobic index and physical and chemical factors of water Gar-Gar River. The overall results indicated that the station 1 in the upstream and before splitting the Karoon into two branches, was non-polluted. However, with the flow of water from the Gar-Gar branch of Shushtar (Station 2), the biological indices represent a moderate pollution. Because of the source of the pollution in station 2 were the organic matter in waste water Shushtar city, and the similarity of stations two and seven from pollution index, highlight the fact that the fish waste water did not increase water River pollution. Published |
