期刊论文详细信息
Planta Daninha
Acute toxicity to herbicides to Oreochromis niloticus
Oliveira, T.A.1  Byrro, E.C.M.1  Santos, J.B.1  Universidade Vale do Rio Doce, Governador Valadares1  UFVJM, Diamantina1  Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina1  Braga, R.R.1  Instituto Nacional de Pesquisas da Amazônia, Manaus1  Botelho, R.G.1 
关键词: alachlor;    atrazin;    2;    4-D;    diuron;    paraquat;    picloram.;   
DOI  :  10.1590/S0100-83582009000300024
学科分类:农业科学(综合)
来源: Sociedade Brasileira da Ciencia das Plantas Daninhas (S B C P D) / Brazilian Society of Herb Science
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【 摘 要 】

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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