The aim ,of this study was to assess the potential impact of trout farm effluents on water quality of Koohrang river （Chaharmahal va Bakhtiary province-Iran） where seven trout farms are localized and to determine th...The aim ,of this study was to assess the potential impact of trout farm effluents on water quality of Koohrang river （Chaharmahal va Bakhtiary province-Iran） where seven trout farms are localized and to determine the some physico-chemichal parameters of the farms. Monthly samples were taken from inflow, outflow and 1,500 meter lower than these farms have been measured and avaluated during 6 months. Measured physico-chemical water quality parameters were DO, BOD5, PO4, NO3, NO2, NH3, TH, PH, TDS, TSS. Monthly data were converted to mean values （-4- standard error） for comparison. Data on water quality parameters of inflow and outflow water and 1,500 meters lower than trout farms are given. Amount of outflow BOD5 in farms has significant difference with inflow water and again has been decreased in 1,500 meters, DO amount in outflow rather than inflow water decreased and in distance of 1,500 meters significant statistically increased （P 〈 0.01）. TSS amount between inflow and outflow of farms has not difference but in 1,500 meters distance has been increased （P 〈 0.01）. PH in inflow and outflow and 1,500 meters lower has not so statistical difference. TH in outflow rather than inflow has been increases and in 1,500 meters distance, its amount has been higher than outflow, too. But this difference has not been significant （P 〉 0.01）. Ammonia in farms outflow rather than inflow has been significant difference （P 〈 0.01）. In flow-through aquaculture systems like raceways and tanks, effluents are discharged to the environment with enhanced concentrations of nutrients and solids. Such effluents may have a serious negative impact on the quality of the receiving water when discharged untreated. The results of this study indicated that trout farm effluents had a impact on the water quality of Koohrang river, but in 1,500 meters distance these parameters modified and suitable for fish farming, as river self purified the environment.展开更多
文摘The aim ,of this study was to assess the potential impact of trout farm effluents on water quality of Koohrang river （Chaharmahal va Bakhtiary province-Iran） where seven trout farms are localized and to determine the some physico-chemichal parameters of the farms. Monthly samples were taken from inflow, outflow and 1,500 meter lower than these farms have been measured and avaluated during 6 months. Measured physico-chemical water quality parameters were DO, BOD5, PO4, NO3, NO2, NH3, TH, PH, TDS, TSS. Monthly data were converted to mean values （-4- standard error） for comparison. Data on water quality parameters of inflow and outflow water and 1,500 meters lower than trout farms are given. Amount of outflow BOD5 in farms has significant difference with inflow water and again has been decreased in 1,500 meters, DO amount in outflow rather than inflow water decreased and in distance of 1,500 meters significant statistically increased （P 〈 0.01）. TSS amount between inflow and outflow of farms has not difference but in 1,500 meters distance has been increased （P 〈 0.01）. PH in inflow and outflow and 1,500 meters lower has not so statistical difference. TH in outflow rather than inflow has been increases and in 1,500 meters distance, its amount has been higher than outflow, too. But this difference has not been significant （P 〉 0.01）. Ammonia in farms outflow rather than inflow has been significant difference （P 〈 0.01）. In flow-through aquaculture systems like raceways and tanks, effluents are discharged to the environment with enhanced concentrations of nutrients and solids. Such effluents may have a serious negative impact on the quality of the receiving water when discharged untreated. The results of this study indicated that trout farm effluents had a impact on the water quality of Koohrang river, but in 1,500 meters distance these parameters modified and suitable for fish farming, as river self purified the environment.
