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Bioaccumulation of heavy metals in some pelagic and benthic fish species in selected wetlands in oil-bearing communities of the Niger Delta

Ogwu Chukwudi, Ideh Victor, Imobighe Mabel

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Int. J. Biosci.20(6), 128-139, June 2022

DOI: http://dx.doi.org/10.12692/ijb/20.2.1-20

Certification: IJB 2022 [Generate Certificate]


This study focused on the determination of heavy metals content of three fish species: Clarias spp, Chana obscura and Tilapia zilli, in the wetlands of 5 Niger Delta oil-producing communities. The samplings which were carried out with the assistance of artisanal fishermen lasted for 6 months from March to September 2021. The samples collected were bulked, composites taken and stored in ice-cool boxes for analysis. The analytical standards adopted were USEPA and APHA and the analytical instrument deployed for the determination of the heavy metals were Agilent ICP-MS7900 and Agilent atomic absorption spectrophotometer model 240A. The mean results obtained are as follows: V ranged from 0.42 µg/g to 0.61 µg/g with a mean of 0.53 µg/g, Mn, concentration ranged from 2.37 µg/g to 5.28 µg/g with a mean of 3.57 µg/g, Cd concentrations of 0.04 µg/g to 0.07 µg/g has a mean of 0.05 µg/g, Ni concentration is between 0.07 µg/g to 0.08 µg/g with a mean concentration of 0.06 µg/g, while As the concentration of 0.25 µg/g to 1.99 µg/g  and has a mean concentration of 1.43 µg/g. The aggregate mean concentrations of the heavy metals were further subjected to a test of significance with ANOVA with SPSS model 21 at a 0.05 level of significance. The p-value is 0.021, thus rejecting Ho. The study recommends that oil companies operating in the Niger Delta should adopt the world’s best practices in the oil industry. Aquaculture and fisheries should be discontinued in the wetlands and remediation should be carried out.


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