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Revista Brasileira de Zoologia

Print version ISSN 0101-8175

Rev. Bras. Zool. vol.14 no.2 Curitiba  1997

https://doi.org/10.1590/S0101-81751997000200007 

Haematological characteristics associated with parasitism in mullets, Mugil platanus Günther, from the estuarine region of Cananéia, São Paulo, Brazil

 

 

María José Tavares Ranzani-PaivaI; Carlos Massatoshi IshikawaI; Benedicto do Espírito-Santo de CamposII; Augusta Cocuzza das EirasI

ISeção de Aquicultura, Divisão de Pesca Interior, Instituto de Pesca, CPA, SAA. Avenida Francisco Matarazzo 455, 05031-900 São Paulo, São Paulo, Brasil
IIInstituto de Zootecnia, CPA, SAA. Rua Heitor Penteado 56, Caixa Postal 60, 13460-000 Nova Odessa, São Paulo, Brasil

 

 


ABSTRACT

This study involved 344 Mullets, Mugil platanus Günther, 1880, captured in the estuarine region of Cananeia, São Paulo, Brazil (25º00'S, 47º55'W). The following data were recorded for each fish: total weight, total length, haemoglobin ratio (Hb), haematocrit (Ht), erythrocyte count (Er), differential leucocyte count (lymphocytes, monocytes, neutrophils, basophils and "other cells") and haematometric indices; MCV, MCH, and MCHC. The sex and stage of gonadal maturity (undifferentiated, juvenile, resting, maturing, mature, and spent) were determined by macroscopical inspection of the gonads. Parasitological inspections revealed the following infestations: Gills - Trichodinidae, Monogenea, Copepoda, and Hirudinea. Liver: cysts of Digenea. Intestine: Nematoda, Digenea and Acanthocephala. Blood: Trypanosoma sp. and Haemogregarina sp. Analysis of variance was done to evaluate how far blood and gill parasitism had any effect on total length, total weight, the biological condition factor or the measured blood parameters. Significant differences were found for the haematocrit (infested versus noninfested by Trichodinidae) and for MCHC (infested versus noninfested by Trichodinidae and Copepoda). No differences were found with regard to leucocytes.

Key words: Mugil platanus, hematology, parasitism, mullet, estuarine region


 

 

Full text available only in PDF format.

Texto completo disponível apenas em PDF.

 

 

ACKNOWLEDGEMENTS. Thanks go to laboratory technicians Jose Plaza and Helio Sanches Mariscal, for their valuable collaborations in the collections of the fish and to graphic artist Regina Celia Barbosa da Silva, who drew the graphs. An IP-SAA/SECIRM joint project.

 

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Recebido em 30.XI.1995; aceito em 10.VI.1997.

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