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by
Muthuswamy NARAYANAN |
Total Records (
1 ) for
Muthuswamy NARAYANAN |
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Rajamanickam VINODHINI
and
Muthuswamy NARAYANAN
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Accidental industrial spills may lead to a high concentration of toxic metals
in the aquatic environment, as well as affecting freshwater ecosystems with acute
and chronic toxicity. Of all aquatic species, fish are particularly sensitive
to waterborne contamination and are recognized as bioindicators for water quality
monitoring. The objective of the present study was to evaluate the biochemical
changes of the enzymatic defense systems in fresh water fish, the common carp
(Cyprinus carpio L.) , when they are exposed to a heavy metal contaminated aquatic
system. The fish were systematically exposed to heavy metal solutions such as
cadmium, lead, nickel, and chromium at a sub-lethal level for a period of 32 days.
The analytical result indicates that heavy metal toxicity in fish organs gradually
increases during the exposure period and slightly decreases at the 32nd day. The
activity of the antioxidant enzymes, superoxide dismutase (SOD), catalase (CAT),
glutathione peroxidase (GPx), and glutathione-S-transferase (GST), in the fish
were increased. This observation clearly indicates the defensive nature and the
adaptive mechanism of cells against free radical induced toxicity. All the results
were statistically significant at P < 0.001. |
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