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Speciation of heavy metals in fish species in the wetlands of oil-bearing communities of the Niger Delta

Ogwu Chukwudi, Imobighe Mabel, Okofu Sabastina, Attamah Fidelia

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Int. J. Biosci.21(2), 169-178, August 2022

DOI: http://dx.doi.org/10.12692/ijb/21.2.169-178


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This study investigated the heavy metals concentration in 3 fish species: Tilapia zilli, Clarias spp, and Chana obscura in the wetlands of oil-producing states of the Niger Delta. In carrying out this study, 5 oil-bearing communities were randomly selected from 5 randomly selected Niger Delta states and fish samples were randomly collected from the wetlands with the assistance of artisanal fishermen. The samples from each wetland were bulked and composites drawn and preserved in the ice-cooled box at -20°C and taken for laboratory analysis. The analytical standards adopted were ASTM and APHA and the analytical instruments deployed are Marek VI standard reagent Australia and Agilent ICP-MS 7900. The results obtained were: Hg range from 0.19µg/l to 0.34 µg/l with a mean of 0.29 µg/l, Cr range from 0.26 µg/l to 0.72 µg/l with a mean of 0.46 µg/l, Pb range from 0.43 µg/l to 0.49 µg/l and the mean  0.48 µg/l and the concentration of V range from 0.73 µg/l to 0.59 µg/l with a mean of 0.67 µg/l  while Cd range was 0.15 µg/l to 0.50 µg/l with a mean of 0.36 µg/l. The results were subjected to a test of significance with ANOVA SPSS model 21 at a 0.05 level of significance. The p-value is 0.41, thus rejecting Ho. The study recommends that fisheries and aquaculture activities should be suspended forthwith. Clean-up and remediation should be commissioned and the Environmental Monitoring Agencies should ensure that oil companies adopt global best practices in doing their businesses in the region.


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Speciation of heavy metals in fish species in the wetlands of oil-bearing communities of the Niger Delta

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