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Pesticides use in paddy rice is a common practice to avoid yield losses due to weeds, insects and diseases. However, not much information is available about the environmental impact of these pesticides in the aquatic systems. The objective of this research was to determine the LC 50; 48h of some herbicides and insecticides comonly used in paddy rice and to estimate the risk coefficient (deterministic analysis), classifying the pesticides toxicity using the fish Danio rerio as a test organism . The following pesticides were evaluated: 2,4-D, metsulfuron-methyl, carfentrazone-ethyl, bentazon, quinclorac, clomazone, oxadiazon, oxyfluorfen, bispyribac-sodium, pyrazosulfuron-ethyl, betaciflutrin, carbofuran, fipronil and lambdacialotrin and the L C 50; 48h value (mg a.i.L -1 ) were: 237.1; >100.0; 2.5; 1150.0; 300.0; 13.8; 3.9; 1.2; >100.0; 67.56; 0.004; 1.3; 0.2 and 0.002, respectivelly. The results suggest that the herbicides oxyfluorfen, oxadiazon and clomazone and the insecticides l ambdacialotrin , betaciflutrin, carbofuran and fipronil are the chemicals with the highest ecological impact risk to the bioindicator D. rerio . Herbicides metsulfuron, pyrazosulfuron, bispyribac, bentazon and quinclorac present low to light risk to the fish D. rerio.

TOXICIDADE AGUDA DE ALGUNS HERBICIDAS E INSETICIDAS UTILIZADOS EM LAVOURAS DE ARROZ IRRIGADO SOBRE O PEIXE <i>Danio rerio</i>