[01] Haram Hassan Abass Bakhiet, Department of Fisheries and Wildlife Science College of Animal Production Science and Technology, Sudan University of Science and Technology Khartoum North, Sudan.

The aim of this study is to determine levels of some heavy metals contaminating White Nile water and their bioaccumulation in various organs of Tilapia species (Oreochromisniloticus). Water and fish samples were taken from two stations in Khartoum city, both of them located on the White Nile River.The first station is Adobaseen Brigade area near the sewage bonds exit and the second station is Jebal awllia dam. Lead (Pb), cadmium (Cd) and copper (Cu) were analyzed quantitatively using Perking Elmer Atomic Absorption Spectrophotometer. The water of the first station contain high level of lead concentration ranging from 0.140 ± 0.02 mg/L compare to the second station Pb range 0.037 ± 0.01 mg/L. Cd concentration in the first station water ranges of 0.049± 0.012 while in the second station ranges between0.0110 ± 0.002 mg/L. Copper concentration in the first station was 0.040±0.009 while in the second station was 0.0151±0.002.Studies on thedifferent parts )muscle, liver gills, and kidney) of the fish revealed higher concentration ranges between0.602 to 0.576mg/g dw in the gills followed by liver ranges between 0.519¬_0 203mg/g dw, and 0.409_0.307 mg/g dw in kidney while the muscle recorded low level ranges between 0.307_0.247mg/g dw Pb. The highest concentration ranges between0.455_0.188 mg/g Cd was detected in the gills, lowestconcentration with a value ranges between0.113_0.121 mg/g dw in the muscle. Also results indicated highest concentration ranges between 0.874 to 702mg/g dw cu was detected in the gills followedby range between 0.673_0.358 mg/g dw. In the kidney range is between 0.603 and 0.457 mg/g dw, and 0.418 to 0.369 mg/g dw in liver and muscle respectively. The results indicated that Adobaseen station contained the highest concentrationof all the detected heavy metals, except (Pb) in liver and (Cu) in gills. Muscle tissues appeared to be the least preferred site for the bioaccumulation of metals as the lowest metalconcentration. This suggests that the fish samples could be used to monitor Pb, Cd and Cu pollution levels in the White Nile River.

Heavy Metals, White Nile, Tilapia Species

[01] Alabaster, J.S. and D.R. LLOY, 1994.Water quality criteria for fresh waterfish. Moscow, pp: 25. [02] BENDICHO, C. and LAVILLA, I. 2003. Ultrasound-assisted metal extractions. Encyclopedia of Separation Science 3: 4421-4426. [03] BoletinOficial Del Estado (1991). Separates delBoletinOficial del Estado Espanol No. 195. Gaceta de Madrid, P: 27154. In: Schumacher, M. and Domingo, J. L. (1996). [04] Bols, N.C., J.L. Brubacher, R.C. Ganassin, L.E.J. Lee, 2001.Ecotoxicology and innate immunity in fish. Dev. Comp. Immunol., 25(8): 853-873 [05] BOYLE, J.F., ROSE, N.L., APPELBY, P.G. and BRIKS, H.J.B. 2004. Recent Environmental Change and Human Impact on Svalbard: The Lake-Sediment Geochemical Record. Journal of Paleolimnology 31: 515-530. [06] Burden VM, Sandheinrich CA, Caldwell A. 1998 Effects of lead on the growth and alpha amino levulinic acid dehydrates activity of juvenile rainbow trout, Oncorhynchusmykiss. Environmental Pollution 101: 285-289. [07] Egbal O. Ahmed, Determination of Cadmium and Lead in Fish Tissues and Water from Khartoum City Sudan Research Journal of Fisheries and Hydrobiology, 5(1): 39-43, 2010 [08] Egyptian Organization for Standardization and Quality Control (EOSQC). 1993. Maximum residue limits for heavy metals in food. Ministry of Industry.No. 2360/1993.PP. 5. [09] FAO, 1975. Biological effects of pollution, reports and studies Vol. 3 No 187, pollution and fisheries. Rome, Italy [10] FAO/WHO (1992) Food Monitoring and Assessment Programmed, WHO, Geneva 5, UNEP, Nairobi. 52. Report of the Third Meeting of the GEMS/Food [11] Marouf HA, Dawoud AS. 2006. Evaluation of heavy metals content in fresh water Crayfish in Damietta. Journal l of Veterinary Medical Association, Egypt 66:217-225. [12] Nevo E, Noy R, Lavie B, Beiles A, Muchtar S.1986.Genetic diversity and resistance to marine pollution. Biological Journal of the Linnean Society 29: 139-144. [13] Nimmo DR, Rigby RA, Bahner LH, Sheppard JM. 1978. The acute and chronic effects of cadmium on the estuarine mysid Mysidopsisbahia. Bulletin of Environmental Contamination and Toxicology 19: 80–85. [14] Seddek AS, Salem DA, El-Sawi NM, Zaky ZM. 1996. Cadmium, lead, nickel, copper, manganese and flourine levels in River Nile fish. Assiut Veterinary Medical Journal, Egypt 35: 95-102. [15] Waldorn HA, Stofen S. 1974. Sub-clinical lead poisoning. Academic Press, New York, pp: 1-224 [16] World Health Organization (WHO). 1984. Guidelines for drinking water quality. WHO, Geneva, No.111. [17] World Health Organization, 1973.The hazard to health and ecology effects of present substance in the environmental ICP/CEP, 101(3).