Comparison of physicochemical factors for inlet and outlet of trout farms in Tonekabon’s Dohezar river
Subject Areas : New Technologies in Aquaculture Development
Keywords: Keywords: Tonekabon, Dohezar river, Rainbow trout, Physicochemical factors, Inlet and outlet of trout fish farm,
Abstract :
Abstract The aim of the present study was to compare water quality parameters in inlet and outlet of two trout farms, and river water 500 m away from each farm in Tonekabon's Dohezar River. Dissolved oxygen, pH, water temperature, ammonium (NH4-N), nitrite (NO2-N), nitrate (NO3-N) and phosphate (PO4-P) were measured for 150 days in any mentioned sampling places. Water temperature solely showed insignificant difference in sampling places. The outflow water of farm 1 (8.77 mg/l) and farm 2 (8.17 mg/l) had the lowest dissolved oxygen. The rate of BOD5 showeda greatest value (4.85 mg/l) for outflow of farm 2 and it had a significant difference with other sampling area. Ammonium, nitrite, nitrate and phosphate revealed a significant difference in all sampling places (p < /em><0.05). As a conclusion, trout farming with using water of Tonekabon's Dohezar river is still considered sustainable and did not impact on river's ecosystem.
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