Abstract
There are no specific formulations of diflubenzuron for the treatment of ectoparasities in freshwater fishes. Many therapeutics protocols of untested efficacy, environmental impact and unknown hematological effects have been introduced in Brazilian aquaculture. The aim of this study was evaluate the diflubenzuron effect on the hematological parameters (total number of erythrocytes, hematocrit, total number of leucocytes and differential count of leucocytes) of “Jundias” (Rhamdia quelen) infected by Lernaea cyprinacea. Four groups of jundias were exposed to a 24 hour immersion bath containing diflubenzuron in concentrations: 0.0 mg.L-1, 0.01 mg.L-1, 0.1 mg.L-1 and 1.0 mg.L-1. These concentrations of diflubenzuron did not show any significant difference in the basal parameters of hematology (Tukey test p < 0.05) of Jundias. More studies about the effect of diflubenzuron on the hematology of infected fishes exposed to a long period of treatment are needed to test chronic effects.
Highlights
O uso indiscriminado de fármacos na aqüicultura, para tratamento de enfermidades, é uma realidade preocupante
O emprego do diflubenzuron na aqüicultura e os impactos ambientais atribuídos à sua alta toxicidade sobre organismos zooplanctônicos já foram discutidos por Mabilia et al (2004a)
Especialmente, para fases de vida mais jovens e que dependem do zooplâncton como fonte de alimento
Summary
O uso indiscriminado de fármacos na aqüicultura, para tratamento de enfermidades, é uma realidade preocupante. Não há trabalhos que investiguem o efeito do diflubenzuron sobre o número total de eritrócitos, o número total de leucócitos, o hematócrito e a contagem diferencial de leucócitos em peixes durante o tratamento de ectoparasitas.
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