Onanuga A.O.,Seboid Properties Ltd |
Ogunbanwo O.A.,Lagos State Polytechnic Ikorodu |
Falaye E.A.,University of Ibadan
European Journal of Scientific Research | Year: 2012
The introduction of metals into the environment resulted to decrease in fishing activities and the quantity of fish caught. The study was conducted to investigate the trace metal contents of the most occurring fish species (Chrysichthys nigrodigitatus) in a Lagoon around Agbara industrial area. Materials and methods. Ologe Lagoon is located in the Western part of a megacity in Nigeria. The Lagoon area is charted between longitudes 2 0 42" to 4 0 42" E and latitude 6 0 22" to 6 0 42" N. The fish analysed were economic species and were bought from the artisanal fishermen in the different sampling locations in Ologe Lagoon. The fish were washed with distilled water and frozen till analysis. The edible muscle of fish was used in the analysis. Wet digestion with 1:1 (v/v) HNO 3 - H 2 O 2 was used in the determination of Fe, Zn, Cd and Pb in the fish samples. Results. Iron (Fe) was detected in very low concentration in fish caught in stations 1, 2, 3, 5, 6, and 7 for dry and wet seasons with exception of Station 4 which had a value of 420 mg/l. Zinc (Zn) with the highest value of 304 mg/l was obtained during the wet season. The cadmium (Cd) value ranged from 0 mg/l (Station 2) in November 2001 to 0.46mg/l (Station 6) in September 2002. The fish caught during the wet season in Station 4 gave an appreciable value of Lead (Pb) (102 mg/l) compared with the value of 2.80 mg/l obtained in the fish caught during the dry season in Station 6. The analysis of variance test conducted on Fe, Zn, Cd, and Pb respectively was significantly different for Zn (p<0.05). Conclusion. The result indicates that the trace metals (Fe, Zn, Cd and Pb) in C. nigrodigitatus caught from the Lagoon are still within the APHA and W.H.O. recommended limits. However efforts should be geared towards the enforcement of government policies as regards the disposition of waste by the industries and fisherfolks around the Lagoon. © 2012 EuroJournals Publishing, Inc.