Histopathological changes in two potential indicator fish species from a hyper-eutrophic freshwater ecosystem in South Africa: a baseline study

  • MJ Marchand
  • JC van Dyk
  • IEJ Barnhoorn
  • GM Wagenaar

Abstract

Histopathological changes were identified in selected target organs from two freshwater fish species,Clarias gariepinus and Oreochromis mossambicus, inhabiting the hyper-eutrophic Roodeplaat Dam near Pretoria. A histology-based fish health assessment protocol was used, including a semiquantitative histopathological assessment of the gills, liver, ovaries, testes, kidney and heart. Water quality analyses showed selected variables to be above the recommended levels, including pH, ammonia, nitrogen, chloride and phosphorus. A number of histopathological alterations were identified in the target organs of both species, with the highest number being in the liver. Species differences were identified in terms of the severity of the alterations within all the organs, with most alterations being regressive in nature. This study provided valuable baseline data that could be useful for future biomonitoring studies.

Keywords: biomonitoring, Clarias gariepinus, histology, Oreochromis mossambicus, Roodeplaat Dam

African Journal of Aquatic Science 2012, 37(1): 39–48

Author Biographies

MJ Marchand
Department of Zoology, University of Johannesburg, PO Box 524, Auckland Park, Johannesburg 2006, South Africa
JC van Dyk
Department of Zoology, University of Johannesburg, PO Box 524, Auckland Park, Johannesburg 2006, South Africa
IEJ Barnhoorn
Andrology, Department of Urology, University of Pretoria, PO Box 667, Pretoria 0001, South Africa
GM Wagenaar
Department of Zoology, University of Johannesburg, PO Box 524, Auckland Park, Johannesburg 2006, South Africa
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Articles

Journal Identifiers


eISSN: 1727-9364
print ISSN: 1608-5914