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Revista Brasileira de Zoologia

Print version ISSN 0101-8175

Rev. Bras. Zool. vol.16 no.2 Curitiba June 1999 



Evaluation of the haematological parameters in Piaractus mesopotamicus Holmberg (Osteichthyes, Characidae) with Argulus sp. (Crustacea, Branchiura) infestation and treatment with organophosphate



Marcos Tavares-DiasI; Maurício Laterça MartinsI; Sérgio do Nascimento KronkaII

ILaboratório de Patologia de Organismos Aquáticos, Centro de Aqüicultura, Universidade Estadual Paulista. Rodovia Carlos Tonanni Km 05, 14870-000 Jaboticabal, São Paulo, Brasil
IIDepartamento de Ciências Exatas, Universidade Estadual Paulista. Rodovia Carlos Tonanni Km 05, 14870-000 Jaboticabal, São Paulo, Brasil. Pesquisador do CNPq




Haematological parameters as erythrocytes, leukocytes and plasma glucose in Piaractus mesopotamicus Holmberg, 1887 were analyzed. Fish were parasitized with Argulus sp. (Crustacea, Branchiura) and treated with 0.4 mg of thriclorphon 500/L water. The effects of parasitism and the action of the treatment were evaluated. Parasitized fish showed greater number of monocytes (P>0.05) and special granulocitic cells (P<0.01) in the peripheric blood than the unparasitized (control) fish. Parasitized fish showed lower number of thrombocytes (P>0.05). Organophosphate treatment presented significantly reduction (P>0.05) in red blood cells (RBC) and hemoglobin.

Key words: Piaractus mesopotamicus, Argulus, parasitism, haemathology



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ACKNOWLEDGMENTS. We would like to thank MSc. Paulo C.F. Carneiro (Centro de Aqüicultura, UNESP, Jaboticabal) for the correction of the translation of the manuscript.



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Recebido em 19.XII.1997; aceito em 29.III.1999.

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