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Fish Physiology and Biochemistry

, Volume 34, Issue 1, pp 61–69 | Cite as

Bioaccumulation of cadmium and its biochemical effect on selected tissues of the catfish (Clarias gariepinus)

  • Samuel O. Asagba
  • George E. Eriyamremu
  • Mabel E. Igberaese
Article

Abstract

The present study examines the pattern of accumulation of cadmium (Cd) and its biochemical effects on selected tissues of a variety of African catfish (Clarias gariepinus), after exposure to various doses of Cd. The results obtained indicate that at the end of 21 days of exposure, the total tissue organ cadmium concentration followed the pattern kidney > gill > liver > muscle for each of the exposure concentrations. The levels of Cd in these organs were higher than those in ambient water. Moreover, while the rate of uptake of Cd increased with time in the kidney, liver and muscle, it decreased in the gill. Superoxide dismutase (SOD) was significantly elevated only in the kidney of catfish treated with 0.2 and 0.4 ppm of Cd for 7 days compared with the control. Conversely, gill SOD was significantly decreased in the same concentrations of Cd-treated catfish relative to the control. Statistically similar levels of SOD were observed in the liver, brain and muscle with all the treatments after the same duration of treatment. In the fish exposed for 21 days, SOD activity was significantly decreased in the kidney with a corresponding increase in lipid peroxidation (LPO), but it manifested only with the 0.2- and 0.4-ppm Cd treatment relative to the control. In the liver, however, Cd exposure significantly increased SOD in the 0.2- and 0.4-ppm treatments of the same duration. In conclusion, the present study indicates that the accumulation of Cd and its effect on SOD and LPO in C. gariepinus is dependent on concentration, tissue and time

Keywords

Cadmium accumulation Catalase Clarias gariepinus Lipid peroxidation Superoxide dismutase 

Abbreviations

Cd

Cadmium

CAT

Catalase

LPO

Lipid peroxidation

MDA

Malondialdehyde

SOD

Superoxide dismutase

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Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  • Samuel O. Asagba
    • 1
  • George E. Eriyamremu
    • 2
  • Mabel E. Igberaese
    • 1
  1. 1.Department of BiochemistryDelta State UniversityAbrakaNigeria
  2. 2.Department of BiochemistryUniversity of BeninBenin CityNigeria

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