Metal accumulation and antioxidant enzyme activity in C. gariepinus, Catfish, and O. mossambicus, Tilapia, collected from lower Mguza and Wright dams, Zimbabwe
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Date
2009-08
Journal Title
Journal ISSN
Volume Title
Publisher
Springer Science+Business Media, LLC
Abstract
The aim of this study was to measure antioxidant
enzyme activities as biological indicators of pollution in
tissues of two species of fish. Five Clarius gariepinus and
three Oreochromis mossambicus were collected from Umguza
Dam (polluted dam) whilst seven C. gariepinus and
eight O. mossambicus were collected from Wright Dam
(relatively pristine dam). Diphosphotriphoshodiaphorase
and catalase activities were consistently lower (42 ± 2%
and 78 ± 20%, respectively) in liver whilst malondialdehyde
levels were two times higher in muscles of both species
of fish collected from Umguza Dam. However, seleniumdependent
glutathione peroxidase (Se-GPX) activity was
elevated four-fold in liver and gills of O. mossambicus collected
from Umguza Dam. Metal levels were two to five
times higher in muscles of both species of fish collected from
Umguza Dam. Fish from Umguza Dam seem to have
responded to pollution by increasing Se-GPX specific
activity in an effort to detoxify peroxides produced as a result
of metal induced oxidative stress.
Description
Keywords
Antioxidant enzymes, Heavy metals, mossambicus, gariepinus
Citation
Siwela, a H., Nyathi, C.B. & Naik, Y.S., 2009. Metal accumulation and antioxidant enzyme activity in C. gariepinus, catfish, and O. mossambicus, tilapia, collected from Lower Mguza and Wright Dams, Zimbabwe. Bulletin of environmental contamination and toxicology, 83(5), pp.648–51.