Sciades herzbergii oxidative stress biomarkers: an in situ study of an estuarine ecosystem (São Marcos' Bay, Maranhão, Brazil)

Authors

  • Raimunda Nonata Fortes Carvalho-Neta Universidade Estadual do Maranhão; Biotecnologia Programa de Pós-Graduação; Rede Nordeste de Biotecnologia
  • Ana Lúcia Abreu-Silva Universidade Estadual do Maranhão; Biotecnologia Programa de Pós-Graduação; Rede Nordeste de Biotecnologia

DOI:

https://doi.org/10.1590/S1679-87592010000800003

Keywords:

glutathione S-transferase, catalase, gonadosomatic index, catfish, marine pollution

Abstract

In order to study the effects of environmental contamination on wild fish, sites were sampled in São Marcos' Bay. The first is located near the ALUMAR/ALCOA port, a potentially contaminated area. The second, located near the Coqueiro beach, was used as a reference area. The activity of antioxidant defence catalase (CAT) and glutathione S-transferase (GST) in S. herzbergii was compared with the biometric data and gonadosomatic index (GSI). The result showed that GSI decreased significantly in females (p<0.05) at the contaminated site. The activity of CAT was higher in fish caught at the contaminated site. A significant difference was observed in GST activity in the liver of S. herzbergii in the comparison between fish from the contaminated site and those from the reference site (p<0.05). GSI provides new insights into the nature of the detoxification response in this catfish species because it is not correlated with the enzymes at the potentially contaminated site. We are, therefore, in a position to suggest that the elevated GST/CAT activity might well be related to the reproduction of the animals at the reference site but not at the potentially contaminated site. If that be the case, one may conclude that GST/CAT and GSI are useful biomarkers of aquatic contamination.

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Published

2010-01-01

How to Cite

Carvalho-Neta, R. N. F., & Abreu-Silva, A. L. (2010). Sciades herzbergii oxidative stress biomarkers: an in situ study of an estuarine ecosystem (São Marcos’ Bay, Maranhão, Brazil). Brazilian Journal of Oceanography, 58(spe4), 11-17. https://doi.org/10.1590/S1679-87592010000800003

Issue

Section

naodefinida