تعيين غلظت كشنده LC50 96h) ( سم آندوسولفان بر روي بچه بر روي بچه ماهيان سفيد 1تا 3 گرمي ( Rutilus frisii kutum) ، كلمه ( Rutilus rutilus caspicus ) و كپور دريايي (Cyprinus carpio )

Determinating of The Lethal concentrations (LC50/96h) of The toxin Endosulfan on the Caspian kutum( Rutilus frisii kutum ), Volba( Rutilus rutilus caspicus) and Common carp( Cyprinus carpio)

This study were studied the short - term acute toxicity of this toxin on Rutilus frisii kutum, Rutilus rutilus caspicus and Cyprinus carpio fingerlings (1- 3g) In this research, aim to determine the 50% lethal concentration (LC50) in 96 hours.These experiments carried out in static condition and based on TRC,1984 standard method in 4 days, and controlled of the effective water physico - chemical factors that having ranges pH = 6.7 - 8 , DH = 205 mg /I (CaC03), DO = 80% and Temp. = 25 ± 1°C .On the base of obtained results the LC50 value of Endosulfan in 96 hours were 0.002 , 0.00053 and 0.0046 mg/1 on Rutilus frisii kutum, Rutilus rutilus caspicus and Cyprinus carpio respectively, and also MAC(Maximum allowable concentration) value of this toxin were determined 0.0002 ,0.000053 and 0.00046 mg/1 for Rutilus frisii kutum , Rutilus rutilus caspicus and Cyprinus carpio.