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Ogunwole et al  

Full Length Research Paper


Illegal Dumpsites and it Impact on Groundwater and Fish Resources (Clarias gariepinus and Oreochromis niloticus)

 

*Ogunwole, G.A.1, Abiya, S. E1 and Otitoloju, A.A2

 

1Department of Biology, Federal University of Technology, Akure. P.M.B 704, Ondo state, Nigeria.
2Department of Zoology, University of Lagos, Akoka. Lagos State, Nigeria..

Corresponding author email:  gaogunwole@futa.edu.ng

Received January 28, 2019; Accepted April 17, 2019

ABSTRACT

The study evaluated the impact of the dumpsite leachate on groundwater at varying horizontal distances from the dumpsite and its biochemical toxicity in two tropical fishes, Clarias gariepinus and Oreochromis niloticus. Heavy metal concentration and physiochemical analysis of the leachate inferred that the dumpsite is at the anaerobic acid phase with its impact on groundwater distance depended. Level of heavy metals such as Cd in well 1- 3 (0.004 – 0.009mg/L) and Zn in well 2 (4.10 mg/L) exceeded the World Health Organization (WHO) permissible level. Computed 96-hour lethal concentration data showed that leachate was 1.26 times more toxic to O. niloticus (11.69 % v/v) than C. gariepinus (14.37 % v/v). In chronic exposure, fishes were exposed to sub-lethal concentrations of the respective 96 hr. LC50 data of the test animals for 30 days, and a control group. In the exposed animals, the activities of the enzyme Superoxide dismutase and catalase was significantly inhibited in C. gariepinus when compared to the control group. In O. niloticus, the enzyme activities of catalase, lipid peroxidation and glutathione S-transferase in the exposed fishes were significantly inhibited when compared to the control group. However, the SOD activity in O. niloticus was significantly inducted when compared with control.


Keywords: Dumpsite; Leachate; groundwater; Clarias gariepinus; Oreochromis niloticus; anti-oxidant.

 

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