Avaliação ecotoxicológica do Fluazuron: efeitos sobre a espécie "Eisenia andrei"

Abstract

The great amount of veterinary inputs used in the control of parasitoses and diseases in cattle has as final destination the environmental compartments, including the soil. Among the main products to control ticks in these animals is Acatak®, with the active ingredient (i.a.) fluazuron. Considering that many of these products reach non-target organisms, it is necessary to evaluate the toxic potential of fluazuron acaricide doses on soil fauna through terrestrial ecotoxicological trials. In this sense, two ecotoxicological tests were performed: one analyzing the behavior (leakage test) and the other with views under the reproduction of the organisms in the soil (chronic toxicity test). The organism selected for the trials was Eisenia andrei earthworms because of their high sensitivity to chemicals and because they are standardized by the ISO (International Standart Organization) for use in ecotoxicological tests. In each of these trials, five increasing concentrations of ia fluazuron were evaluated in artificial soil (0, 1.0, 3.0, 6.0, 9.0 and 12.0 (mg kg -1 dry soil). In the behavioral test that the worms avoided the soil containing concentrations from 3.0 mg kg-1, whereas in the chronic toxicity test no significant effects were observed on the reproduction of the oligochaetes, nor in the highest tested dose of In the reproduction test, after 56 days, no significant death of theworms was observed at the highest dose tested. With these results it can be observed that fluazuron had an effect on the behavior, but did not Earthworms at concentrations up to 12.0 mg kg-¹.