Evaluation Of The Effects Of Rainbow Trout Fish Farms On Qala-Rodkhan River Water Using Physicochemical Parameters - Gilan Province

The effect of rainbow trout fish farms effluent on the physical and chemical components of Qala Rudkhan river water was investigated. 6 study stations were selected along the river 2 stations from Foshe branch (as control stations) and 4 stations from Qala Rudkhan branch). The parameters were measured every 30 days for 9 months from October 2014 to June 2015. The evidence shows that there is no significant difference between the water physical parameters (water temperature, dissolved oxygen and flow rate) of the control station and other stations (p>0.05). At the same time, in terms of water chemical parameters (nitrite, nitrate, phosphate, and ammonium), a significant difference was found between station 1 of Qala Rudkhan (Effluent exit location) and the control station (p<0.05). Also, no significant difference was found between station 4 of Qala Rudkhan and the control station, except for the nitrate component. The results showed that, in the conditions of this research, during the sampling period, the river of Qala Rudkhan has a suitable self-purification capability in the downstream stations.