ОЦІНКА ТОКСИЧНОСТІ ВОДИ РИБОГОСПОДАРСЬКИХ ВОДОЙМ ЗА ДОПОМОГОЮ БІОТЕСТУВАННЯ НА DAPHNIA MAGNA STRAUS
The article presents the results of toxicity fishery waters using biological testing on Daphnia magna Straus. As test objects were used crustaceans - Daphnia (Daphnia magna Straus). When determining the acute toxicity criterion was the mortality of the test organisms relative to control. Accounting dafny, survivors were conducted after 1, 6, 24, 48, 72 and 96 hours. The conclusion about the presence of chronic actions made on the basis of establishing the reliability of differences between survival rates or fertility in the control and test water samples. In the experiments on daphnia determined that the analyzed water samples from the fishery waters had not expressed acute toxic effects. In all cases, the survival rate was on the level of control, but in the water sample No. 5 recorded the lowest value of the absolute number of survival of daphnia. Therefore, for a more detailed analysis of water samples it is advisable to spend a long biotesting, which allows to determine the chronic toxicity of water by reducing their survival and fertility. In the water sample No. 5 was reduced fecundity of daphnia. Thus, the fecundity of crustaceans accounted for 70 %, and in other samples deviations from concontrol was not significant. Within the period of testing in experimental daphnia was not observed in pathological deviations - abortive eggs, stillborn and youth with disabilities.