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Título: | Acute toxicity to herbicides to Oreochromis niloticus |
Título(s) alternativo(s): | Toxicidade aguda de herbicidas a tilápia (Oreochromis niloticus) |
Autor: | Botelho, Rafael Grossi Santos, J. B. Oliveira, Taciane Almeida de Braga, Renan Rodrigues Byrro, Eliza Catharina Mota |
Palavras-chave: | Oreochromis Niloticus Salmonidae |
Data do documento: | 2009 |
Revista: | Planta Daninha |
É parte de: | Volume 27, Número 3, Pags. 621-626 |
Abstract: | Two assays were carried out to evaluate Oreochromis niloticus sensitivity to different herbicides. In the first experiment, atrazin concentrations (0; 2.5; 5; 10 and 20 mg L-1) were evaluated aiming to determine lethal concentration (LC50) to O. niloticus. In the second assay, the effects of the herbicide mixtures alachlor + atrazin (5.33 + 5.33 mg L-1), diuron + MSMA (5.33 + 2.13 mg L-1), paraquat (1.33 mg L-1) and 2,4-D + picloran (1.28 + 0.34 mg L-1), were evaluated on O. niloticus survival after 96 h of exposure. In the first assay, a sharp decrease in fingerlings survival was observed from 3 mg L-1 of atrazin with CL50 value of 5.02 mg L-1 and a high biomass decrease due to herbicide presence. In the second assay, a greater negative effect was observed on fingerlings by alachlor + atrazin.. After 72 h of incubation, intoxication rate showed a reduction in the number of individuals of 17.4% for paraquat, 2,4 D + picloram and diuron + MSMA, and of 100% for alachlor + atrazin. It was concluded that CL50 obtained for atrazin is inferior to that listed as toxic to trouts and that the alachlor + atrazin mixture can be characterized as a risk to O. niloticus, even when applied at commercially recommended rates. |
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