عنوان مقاله [English]
In this study the filtration rate of nitrogen and phosphorus components by Swan mussel Anodonta cygnea in a recirculation system was investigated. The system was built of a 100 liters main tank and 4 recipients of 2.5 liters each (One of these as control) and one tank for returnin of water. Three treatments of different concentrations of nitrogen (80, 100 and 200 mg/l) and phosphorus (20, 40 and 60mg/l) separately were examined. In all treatments, sampling was repeated 3 times. Results showed that in three treatments during thise time, the filtration rates were reduced. Also an increase in Nitrogen concentration caused filtration rates to be increased. Filtration rates in the first treatment increased from 6.53±0/03 to 7.15±0/02 and then to 8.07±0/05 ml. min-1.gr-1 AFDW from the first to the third treatment respectively. The filtration rates in phosphorus treatment has also increased when the concentration increased. This has been changed from 5.61±0/01 to 6.5±0/04 and 7.58±0/09 ml. min-1. gr-1 AFDW from first to third treatment. Results of filtration rate of nitrogen and phosphorus showed that the performance of Anodonta cygnea in the absorption of nitrogen and phosphorus components, is appropriate.
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