BIOACCUMULATION OF HEAVY METALS IN SOME FISH SAMPLES FROM OGUTA LAKE, IMO STATE, NIGERIA

N. Mgbemena, G. A. Obodo

Abstract


This study is focused on the bioaccumulation of heavy metals in some fresh water fish species in Oguta Lake. Four species of Fish namely Tilapia (Oreochromis niloticus), Eel (Auguilla rostratra), cat(Claries gariepinus) and channa (Channa arous) were got from Oguta Lake. These fish species were analysed for heavy metals namely, Arsenic, chromium, copper, cadmium, lead and mercury. The results showed the concentrations of the metals in the fishes in the order below; for Arsenic, Channa 0.049mg/kg, Eel 0.039 mg/kg, catfish 0.029 mg/kg, tilapia 0.04 mg/kg. For Chromium Eel 0.12mg/kg, Tilapia 0.11mg/kg, cat 0.10mg/kg, Channa 0.09mg/kg. For copper, Tilapia 0.68mg/kg, channa 0.53mg/kg, cat 0.42mg/kg, Eel 0.36mg/kg; Cadmium, Cat 0.064mg/kg, Eel 0.063mg/kg, Channa 0.063mg/kg, Tilapia 0.060, Lead, Channa 23.1mg/kg, Cat 12.00, Eel 0.96mg/kg and Tilapia 0.76mg/kg and Mercury, Cat 0.09mg/kg, Channa 0.068, Tilapia 0.065 and Eel 0.065.   The result was compared with the standards of  WHO and FAO and  were found to be lower than their permissible levels  except for Pb that was higher than the permissible levels in all the fishes and mercury that was also higher in catfish and channa fish.

Keywords: Bioaccumulation, concentrating, fish species, toxic.


Full Text:

PDF

Refbacks

  • There are currently no refbacks.


Chemical Society of Nigeria