Acute toxicity test of agricultural pesticides on silver catfish (Rhamdia quelen) fingerlings

Ciência Rural

Luiz Carlos Kreutz²  Leonardo José Gil Barcellos¹  Tális Oliveira Silva²  Deniz Anziliero²  Daiana Martins²  Monique Lorenson²  Ariane Marteninghe²  Leonardo Bolognese Da Silva¹ 

[1] ,Universidade de Passo Fundo Faculdade de Agronomia e Medicina Veterinária Hospital VeterinárioPasso Fundo RS ,Brasil

关键词: bioassay;    toxicity;    pesticides;    LC50;    Rhamdia quelen;    bioensaio;    toxicidade;    pesticidas;    CL50;    Rhamdia quelen;   

DOI  :  10.1590/S0103-84782008000400022

来源: SciELO

【 摘 要 】

Toxicity risks of agricultural pesticides to fishes are pivotal. Currently, many questions remain unsolved regarding to the toxicity of commonly used pesticides to silver catfish (Rhamdia quelen), a South American catfish. The present studies have been designed to investigate the acute toxicity and the lethal concentration (LC50) of four herbicides, two fungicides and two insecticides to silver catfish fingerlings. All experiments were carried out in triplicates, in a static bioassay system, using commercially available pesticides. The data was analyzed through the Trimmed Spearman-Karber method available from the Environmental Protection Agency. The 96hLC50 and 95% lower and upper confidence limits, respectively, for the following pesticides were determined: glyphosate (7.3mg L-1; 6.5-8.3), atrazine (10.2mg L-1; 9.1-11.5), atrazine+simazine (10.5mg L-1; 8.9-12.4), mesotrione (532.0mg L-1; 476.5-594), tebuconazole (5.3mg L-1; 4.9-5.7), methylparathion (4.8mg L-1; 4.3-5.3), strobulurin and triazol (9.9mg L-1; 8.7-11.2). Diflubenzuron was also tested and caused no fish mortality up to 1g L-1. The toxic concentration of these pesticides to silver catfish fingerlings fell above the concentration used for application in the field and, except following accidental application or misplacing of empty recipients, it should not cause fish mortality. Nonetheless, the data obtained will be useful to study the long-term effect of these products on the hematological, biochemical, hormonal and immunological parameters of silver catfish and related fish species in South Brazil.

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