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Os objetivos deste trabalho foram calcular a CL (I) 50-96h do inseticida organofosforado paration metilico e do biopesticida azadiractina para alevinos e juvenis de pacu ( P. mesopotamicus). Tambem pretendeu-se avaliar o efeito do peso corporeo sobre a toxicidade aguda do paration metilico e do neem para o pacu, bem como classificar o risco ambiental do uso de paration metilico e do neem para o controle de parasitas e patogenos de pacu. Foram realizados dois experimentos, em condicoes laboratoriais, para a determinacao da concentracao letal (CL (I) 50-96h). A CL (I) 50-96h calculada do paration metilico foi de 3,97 mg/L para os alevinos e de 9,89 mg/L para os juvenis. Para a azadiractina foi de 1,20 mg/L para os alevinos e de 1,18 mg/L para os juvenis. As concentracoes de 1,0 mg/L de paration metilico para os alevinos e de 7,5 mg/L para os juvenis e as de 0,29 e 0,59 mg/L de azadiractina nao provocaram mortalidade nos animais expostos e podem ser utilizadas como referencia em estudos de controle de parasitas em pacu . O paration metilico foi menos toxico para os alevinos e para os juvenis de pacu do que a azadiractina, indicando a necessidade de cuidados com a utilizacao de extratos aquosos de neem no ambiente aquatico. ACUTE TOXICITY OF THE INSECTICIDE METHYL PARATHION AND OF THE BIOPESTICIDE AZADIRACHTIN FROM NEEM LEAVES (Azadirachta indica) TO ALEVINE AND JUVENILE PACU (Piaractus mesopotamicus) Abstract The objectives of the present study were: to calculate the lethal concentration LC (I) 50-96 h of methyl parathion and of the biopesticide azadirachtin to alevine and juvenile pacu ( P. mesopotamicus). Also to determine the effect of body weight on acute toxicity of methyl parathion and of neem for pacu, as well as to classify the environmental risk of the methyl parathion and neem uses for the control of pacu parasites and pathogens. Two experiments were performed under laboratory conditions for the determination of the LC (I) 50-96 h. The LC (I) 50-96 h of methyl parathion was 3.97 mg/L for alevine and 9.89 mg/L for juvenile fish. The LC (I) 50-96 h of azadirachtin was 1.20 mg/L for alevine and 1.18 mg/L for juvenile pacu. Concentrations of 1.0 and 7.5 mg/L of methyl parathion and of 0.29 and 0.59 mg/L of azadirachtin for alevine and juvenile pacu, respectively, did not cause mortality in the exposed animals and can be used as references in studies on the control of parasites in pacu. Methyl parathion was less toxic to alevine and juvenile pacu than azadirachtin, indicating the need for careful utilization of aqueous neem extracts in aquatic environments.

pesticidas

TOXICIDADE AGUDA DO INSETICIDA PARATION METÍLICO E DO BIOPESTICIDA AZADIRACTINA DE FOLHAS DE NEEM (Azadirachta indica) PARA ALEVINO E JUVENIL DE PACU (Piaractus mesopotamicus)