Organic pollution of the Buyuk Menderes River, Turkey and effects on aquaculture

Abstract

Water quality was measured at eight stations on the Buyuk Menderes River in Turkey (Adiguzel dam, Yenice regulator, Saraykoy bridge, Feslek regulator, Yenipazar bridge, Aydm bridge, Kocarli bridge, Soke regulator) between 2000 and 2013 in February, April, June, August, October and December. The resulting data were evaluated in terms of biochemical oxygen demand (BOD), chemical oxygen demand (COD), dissolved oxygen (DO), ammoniac-nitrogen (NH3-N), nitrite-nitrogen (NO2-N), nitrate-nitrogen (NO3-N) and orthophosphate (o-PO4) aquaculture. According to the analysis, while river water pollution generally varied during each year, samples from certain measurement points demonstrated high pollution levels throughout the year. In this study, water parameters were classified according to the "Turkish water pollution control regulation." The studied parameters are also compared with TS 266 and WHO guidelines. While levels at Saraykoy station were generally higher than other stations, values at Adiguzel dam were the lowest, giving it the best water quality of the eight stations. The highest values on a yearly basis were obtained in 2007 due to the severe drought in the Menderes basin within which irrigation water levels fell to 4255 m(3)/ha. The BOD, COD levels are the lowest in 2009 and highest in 2007; the DO level is lowest in 2007 and highest in 2009; NH3-N, NO2-N, and NO3-N parameters are the lowest in 2007 and highest in 2009; and the o-PO4 are at the lowest level in 2004 and seen as the highest in 2007. Analysis of the data was performed by SPSS 21 statistics program. One direction ANOVA was applied to the data, which were also subject to Tukey multiple comparison tests. Differences between groups were evaluated at p < 0.05. Box-plot graphs were used to demonstrate the data distribution. In the study, it was analyzed, the effect of fish species and pollution involved in the Buyuk Menderes River so far on fish species.