Onyidoh et al Greener Journal of Agricultural Sciences Vol. 8 (1), pp. 012-021, January 2018. ISSN: 2276-7770 Research Article Manuscript Number: 110217163 (DOI: http://doi.org/10.15580/GJAS.2018.1.110217163) Risk Assessment of Heavy Metals in Wild and Farmed Clarias gariepinus (Burchell, 1822) in Zaria, Kaduna State, Nigeria Onyidoh Henry Eric, Ismail Falalu Muhammad, Muhammad Ahmad Muhammad & Idris Jaafar Abdullahi Department of Biology, Faculty of Life Sciences, A.B.U, Zaria Abstract The likely health risks developed as a result of human contamination by heavy metal through fish consumption was assessed in this study. The analysis of wild and farmed fish for heavy metals was determined and an assessment of the risk limits was evaluated through daily intake of metal and health risk index. Heavy metals accumulations varied in concentrations in the various tissues/organs (skin, muscle, gills, liver, intestine, kidneys, brain, and bones) across the groups of farmed and wild fish species (Clarias gariepinus). A post-hoc multi-comparison (Duncan Multiple Range Test) showed that there were significant differences ( < 0.05) across analysed samples. The analysis of heavy metals concentrations, in the investigated tissues of Clarias gariepinus, showed levels of heavy metals accumulations in the order: Fe>Hg>Pb>Cd>Ni and were all below the recommended safety limits outlined by FAO/WHO. Furthermore, the consumer’s health risk with the consumption of fish muscles tissues shows that there are very negligible tendencies for cadmium, lead, and mercury exposure. Also the ingestion of Clarias gariepinus with heavy metal concentrations indicated in this study is within the FAO/WHO safety daily intake limits (also specified in the study) and would not result in accumulation of heavy metals at intolerable concentrations, thus health complications arising from accumulation of heavy metals are rare Keywords: Daily intake of Metals, Health risk index, Heavy metals, Risk assessment Return to Content View [Full Article – PDF] [Full Article – HTML] [Full Article – EPUB] Post-review Rundown View/get involved, click [Post-Review Page] References Abubakar A, Uzairu A; Ekwumemgbo PA and Okunola OJ (2015). Risk Assessment of Heavy Metals in Imported Frozen Fish Scomber scombrus Species Sold in Nigeria: A Case Study in Zaria Metropolis. Advances in Toxicology, Vol. 2: 1-12 Ali M and Soltan M (1996). The Impact of Three Industrial Effluents on Submerged Aquatic Plants in the River Nile, Egypt. Hydrobiologia, Vol. 340 (1-3): 77- 83. 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