Comparative Studies of Delthametrin Acute Toxicity in Exotic and Brazilian Fish
DOI:
https://doi.org/10.5132/jbse.2007.02.002Palavras-chave:
fish, deltamethrin, Danio rerio, H. bifasciatus, G. brasiliensis, O. niloticus, acute toxicityResumo
Deltamethrin (2,2-dimetil-3-(2,2-dibromovinil)-ciclopropilcarboxilate alpha-cianofenoxibenzilo), a type II pyrethroid, is used in agricultural applications such as fruits and vegetables plantations, and as maidservants in the combat to fleas, ticks and mange on pets. In the present study, tests of acute toxicity were performed with this pesticide in commercial formulation for the species Danio rerio, Hyphessobricon bifasciatus, Geophagus brasiliensis and Oreochromis niloticus with the objective of determining the values of lethal concentration 50% (LC50), 48h. The tests demonstrated similar toxicity to the pesticide for D. rerio and H. bifasciatus. The values of LC50;48h is 0.078 μg L–1 to D. rerio and 0.082 μg L–1 for H. bifasciatus with 95% confidence limits 0.05-0.11 μL–1 for both. The tests performed with the species G. brasiliensis presented values of LC50;48h of 0.594 μg L–1 with 95% confidence limits 0.33-0.94 μg L–1. The species O. niloticus presented in the tests the largest values of LC50;48h among the used species, 0.954 μg L–1 with 95% confidence limits 0.71-1.22 μg L–1. The tests demonstrated a great toxicity of the pesticide for all tested species of the fishes, demonstrating that the contamination of aquatic environmental can cause great fish slaughter in a short period of time, indicating the require of special attention in relation to its use.
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