International Journal of Science and Technology

International Journal of Science and Technology>> Volume 7, Number 2, February 2017

International Journal of Science and Technology

Investigation of Selected Trace and Heavy Metals in two Tropical Fish Species from the Coastal Waters of Ghana

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Author Elvis Nyarko, Bennet Atsu K. Foli, Daniel G. Achel, Benjamin Osei Botwe, Theodosia Adom, Joseph Richmond Fianko, Shiloh Dede Osae
On Pages 40-47
Volume No. 3
Issue No. 1
Issue Date January, 2013
Publishing Date January, 2013
Keywords Chloroscombrus chrysurus; fish; heavy metals; public health; Sardinella maderensis; sublethal effects; trace elements


Cadmium (Cd), copper, (Cu), Iron (Fe), lead (Pb), and zinc (Zn) burdens were determined by atomic absorption spectrophotometry (AAS) in two tropical fish species (Chloroscombrus chrysurus and Sardinella maderensis) from the western coast of Ghana. Trace elements and heavy metal concentrations in both species followed the order Fe>Zn>Cu while Cd and Pb were below detection limits. High levels of Fe were detected in the fish samples with concentration ranges of 13.05-376.4 g/g dw. Levels of Cu recorded during particular sampling periods were above FAO maximum recommended limits of 30 g/g in fish while Zn burdens were below FAO recommended limit of 40 g/g. S. maderensis and C. chrysurus, can be considered safe for human consumption with respect to Cd, Pb and Zn contaminations. However, Cu will require further monitoring to protect public health. Hazard quotients and hazard indices computed indicate that metal exposure from consumption of the two fish species will not result in any appreciable health risk. Levels of Cu and Zn recorded may however pose threats to physiological functioning of fish since levels were high enough to cause sublethal effects to fish. Metal burdens studied provide background information prior to the commercial exploitation of oil in Ghanas marine waters.

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