Liver oxidative stress of the grey mullet Mugil cephalus presents seasonal variations in Ennore estuary

Abstract

The objective of this study was to determine the liver oxidative stress status of grey mullets living in heavy-metal-rich polluted Ennore estuary compared with unpolluted Kovalam estuary. Fish were collected from both estuaries during the monsoon and summer seasons from October 2004 to September 2006. Fish liver homogenate (N = 20 per group) was prepared for evaluating oxidative stress parameters. Fish living in the polluted estuary had significantly higher lipid oxidation products, conjugated dienes (0.346 ± 0.017 vs 0.141 ± 0.012 ∆A 233 /mg protein), lipid hydroperoxides (0.752 ± 0.032 vs 0.443 ± 0.03 nmol/mg protein), and lipid peroxides (3.447 ± 0.14vs 1.456 ± 0.096 nmol MDA/mg protein) than those of the unpolluted estuary during the summer. In contrast, significantly lower levels of superoxide dismutase (20.39 ± 1.14 vs 53.63 ± 1.48 units/mg protein) and catalase (116 ± 6.87vs 153 ± 8.92 units/mg protein) were detected in the liver of fish from the polluted estuary (Ennore) compared to fish from the unpolluted estuary (Kovalam) during the summer. Variations in most of the oxidative stress parameters were observed between the summer and monsoon seasons, indicating the importance of seasonal variation for estuaries and their inhabitants.

Oxidative stress biomarkers in Senegal sole, Solea senegalensis, to assess the impact of heavy metal pollution in a Huelva estuary (SW Spain): Seasonal and spatial variation

“…Values were higher in the warmer season. Padmini et al (2008), Padmini and Vijaya Geetha (2009) also observed in Mugil cephalus an oxidative stress (LPO) was more severe during summer than the monsoon (cold season) in polluted estuary fish, but no significant difference in the results was observed between the seasons in unpolluted estuary fish. Same response in LPO was observed by Aras et al (2009) in three species of Salmo trutta where values of LPO were higher in autumn than spring.…”

A biomonitoring study: Using the biomarkers in Cyprinus carpio for the evaluation of water pollution in Sapanca lake (Sakarya, Turkey)

“…Karadağ et al (2014) determined that increased CAT activity in carp samples were taken from the polluted area by untreated wastewaters, when compared to the relatively clean areas of Ataturk Dam Lake, Turkey. Padmini et al, (2008) determined the liver oxidative stress status of grey mullets living in heavy-metal-rich polluted Ennore Estuary compared with unpolluted Kovalam Estuary. CAT was significantly decreased in polluted estuary fish compared with unpolluted estuary fish.…”

Physiological Adaptations of Stressed Fish to Polluted Environments: Role of Heat Shock Proteins

“…Wilhelm Filho et al (2001) studied the influence of pollution on the antioxidant defenses of the cichlid Geophagus brasiliensis and suggested that the use of biochemical indicators in environmental pollution studies is of high toxicological relevance and oxidant-mediated responses are useful indices of environmental quality. There are also cases of a negative correlation having been established between oxidative stress and both antioxidant defense status and the activities of detoxification enzymes, in polluted environments (Padmini and Vijaya Geetha 2007c;Padmini et al 2008a. Lipid peroxidation and subsequently reduced antioxidant defense, noted under cytotoxic conditions, support the use of such parameters as biomarkers of toxicity (Cossu et al 2000;Telli Karakoc et al 1997).…”