Pages: (61-66 )
Abstract
This study was designed to investigate the concentration of heavy and trace metals in the gills, liver and kidney of Oreochromis niloticus and Clarias gariepinus obtained from Dandaru, a fish pond at Ibadan Oyo state. The samples were digested using the method described by AOAC, 2005 while the concentration of heavy and trace metals were determined using Atomic Absorption Spectrometer (AAS). The result obtained from the heavy and trace metal analysis of the gill, liver and kidney of O. niloticus from Dandaru pond showed that the value of lead which is a heavy metal ranged from 0.06 to 0.10 μg/g while in C. gariepinus it ranged from 0.06 to 0.90 μg/g. The result obtained showed that the values of the heavy and trace metals determined in the gill, liver and kidney of O. niloticus and C. gariepinus obtained in dandaru pond was higher than values obtained in the control samples, with the exception of mercury which was not detected at all. The highest concentration of metals determined in Dandaru pond was found in the kidney of O. niloticus and C. gariepinus. The result also revealed that the values of manganese, iron, and lead exceeded the WHO permissible limit in Fish. This study clearly showed an implication of heavy metal bioaccumulations occasioned by direct pond pollution in the gills, liver and kidney of the samples, therefore, adequate monitoring of the pond is highly recommended while adequate information, education and training should be introduced to control further pollution.
Keywords: Heavy metals; fish; pollution; dandaru pond and trace metals,