journal of kerbala university

This study aimed to determine the effect of the insecticide Abate in some Biological characters on water flea Daphnia magna. Using a series of concentrations namely (0.25 – 0.5 – 0.75 – 1- 1.25) µg/L the experiments carried on different environmental conditions (absent of oxygen , present of oxygen , addition of some suspension particles),in order to study the effect of these particles on the studying characters . The results indicated that the mortality percentage has a positive relationship with the utilizing concentrations , the LC50 for Abate on Daphnia magna was 0.99 µg/L but when the suspension particles were used this value raised to (1.19 – 1.16) for bentonite and clay as sequence at a period of continuous exposure. The results of Abate treatment at a period of chronic exposure on some reproduction indicators ( number of broods for each female and the juveniles number rate for each brood). And the results showed that using of this insecticide leaded to significant reduce in both parameters on all cases of treatments (absent of oxygen , present of oxygen , addition of some suspension particles) . as well as these results effected on life tables of Daphnia magna because it cased reduced in the values of net replacement rate (RO) and the intrinsic rate of increase (rm).