The Impact of Rainbow Trout Farm Effluents on Water Physicochemical Properties of Daryasar Stream

In order to study the effect of aquaculture activities in a rainbow trout breeding and cultivation farm on water physicochemical properties of Daryasar Stream (North of Iran), 5 sampling sites were selected inside the stream. The first station located at 35 m before the outlet was selected as the reference station and others were at the distance of 35, 125, 400 and 750 m after the outlet (50 m before the adjacent farm). A 15-day sampling intervals was selected and sampling survey was conducted in summer 2011. Physicochemical parameters including temperature, pH, EC, TDS, turbidity, DO, NO , NO , TAN and PO were measured. The results showed 3 2 4 that farm activities caused no significant changes in physical parameters of the water (P>0.05) while the difference of nitrogen and phosphorous compounds between before and after the outlet was significant (P<0.05). The latter compounds showed increasing trend at stations located near the outlet while indicated a downward trend at other stations implicating self-purification capacity of the stream for the pollutants.

Aquaculture Effects Water Pollution Water Physicochemical Properties Rainbow Trout Daryasar