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In this study, 20 physicochemical parameters were measured mountly in 2007 and seasonaly in 2008 and 2009 on Akpınar Stream, which is located within the borders of Denizli and has 13 trout production facility. The data obtained were evaluated according to the fresh water fish directive which was agreed by the Commision of European Union (EC Directives) and Water Pollution Control Regulation Criteria. We determined that, the measured parameters on the first station do not constitute any risk for Salmonids and Cyprinids according to EC Directives and in the second station, the values of biological oxygen demand and nitrite were high enough to adversely affect the health offish. There is not a significant difference between two stations for the parameters of oxygen, nitrate, total nitrogen, pH, chemical oxygen demand, acid binding capacity, total hardness and chlorine. The parametes of total suspended solids, ammonium, nitrite, secondary phosphate, total phosphorus, organic matter, ammonia, biological oxygen demand, turbidity, temperature and flow rate were significantly high in second station (p<0.05). The reason of high levels of the parameters especially origin of organic pollution in the secod station is fish feces and feed wastes which directly given into the water. Settling ponds should be used properly and controls should be provided to increase for more healty production. [ABSTRACT FROM AUTHOR]

Gediz River is the largest river flowing into Izmir Bay. It has got seasonally fluctuating regime. It's annual mean flowing rate was measured as 21,64 ± 3.02 m³/s during the period of 2004-2005 in which the seasonal samplings for the study have been carried out. Special attention was paid for the coverage of low (November) and high (February) flow periods. Its total suspended solids (TSS) concentrations were compared with those of Izmir Bay, and the TSS loads through the mouth of the river were calculated. Many researchers reported so far that "Gediz River is a pollution source for Izmir Bay", however there was no any mathematical explanation based on measurements showing a volume estimation as a pollution source and/or indicating any time pattern. This study has been presenting some answers to these questions. [ABSTRACT FROM AUTHOR]