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Haematological characteristics of freshwater-reared and wild mullet, Mugil platanus Günther (Osteichthyes, Mugilidae)

Abstract

Mullets, Mugilplalanus Günther, 1880. were obtained from the estua-rine area of CananÉia (São Paulo, Brazil) and from freshwater tearing tanks. For each fish the body weight, body length, gonad weight and gonad maturation stage were recorded and the allometric index (K) was calculated. Blood was collected for hematocrit (Ht), hemoglobin level (lib), total cell count (Er), and the determination of hematological indices (MCV. MCH, MCHC), as well as the differential leukocyte count (lymphocytes, monocytes, neutrophils, basophils and '"other cells"). The averages of the hematological analyses, hematological indeces, condition factor and leukocytes percentage of the specimens acclimated to fresh water were significantly higher than those of the specimens from the estuary.

Mugil plalanus; haematology; mullet; freshwater rearing


Haematological characteristics of freshwater-reared and wild mullet, Mugil platanus Günther (Osteichthyes, Mugilidae)

Maria José T. Ranzani-Paiva; Carlos M. Ishikawa

Seção de Aquicultura, Divisão de Pesca Interior, Instituto de Pesca (CPA-SAA). Avenida Francisco Matarazzo 455, 05031-900 São Paulo, São Paulo, Brasil

ABSTRACT

Mullets, Mugilplalanus Günther, 1880. were obtained from the estua-rine area of CananÉia (São Paulo, Brazil) and from freshwater tearing tanks. For each fish the body weight, body length, gonad weight and gonad maturation stage were recorded and the allometric index (K) was calculated. Blood was collected for hematocrit (Ht), hemoglobin level (lib), total cell count (Er), and the determination of hematological indices (MCV. MCH, MCHC), as well as the differential leukocyte count (lymphocytes, monocytes, neutrophils, basophils and '"other cells"). The averages of the hematological analyses, hematological indeces, condition factor and leukocytes percentage of the specimens acclimated to fresh water were significantly higher than those of the specimens from the estuary.

Key words:Mugil plalanus, haematology, mullet, freshwater rearing

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ACKNOWLEDGMENTS. The authors thank the technicians José Plaza and Hélio Sanches Mariscal, for collaborating with the collection of specimens, biologist Augusta Cocuzza das Eiras and graphic artist Regina Célia for drawing the graphs, and the Instituto Oceanográfico, Universidade de São Paulo, for the use of the laboratory in Cananéia.

Recebido em 07.VI.1996; acelto em 22.X.1996.

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Publication Dates

  • Publication in this collection
    13 July 2009
  • Date of issue
    1996

History

  • Accepted
    22 Oct 1996
  • Received
    07 June 1996
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