Nigeria. Tropical Freshwater Biology, 1991:2: Kotze, P. Du., Preez, H. H. and J. H. J. Van 243 248. Vuren. Bio-accumulation of copper and zinc in – Etim, l., Akpan, E. R and Muller, P. Temporal and Oreochromis mossambicus Clarias trends in heavy metal concentrations in the clam from the Olitants River, gariepinus (Bivalvia: Tellinacea: Mpumalanga, South Africa. Water S.A, 1999: Egeria radiata Donacidae) from Cross River, Nigeria. Revue d’ 25 (1):99-110. Hydrobiologie Tropicale, 1990:24 (4):327-333. United States Environmental Protection Agency FAO / WHO. List of maximum levels (USEPA). Biological indicators of watershed recommended for contaminants by the Joint health. Available at Last http://www.epa.gov/ FAO/WHO modified January, 1987. Codex Alimentarius Commission. Second Series. CAC/FAL, Rome, 1984:3: 1–8. D. S., Becker, C. E. and Smith, A. H. Fleeger, J. W., Carman, K. R. and Nisbet, R. M. Chronic low-level lend exposure: its role in the (2003). Indirect effects of aquatic contaminants pathogenesis of hypertension. Medical in aquatic ecosystem. Sci. Total Environ, Toxicology, 1987: 2: 210-232. 2003:317(1): 207-233 7/17/2015
Nigeria. Tropical Freshwater Biology, 1991:2: 243 – 248. Etim, l., Akpan, E. R and Muller, P. Temporal trends in heavy metal concentrations in the clam Egeria radiata (Bivalvia: Tellinacea: Donacidae) from Cross River, Nigeria. Revue d’ Hydrobiologie Tropicale, 1990:24 (4):327-333. FAO / WHO. List of maximum levels recommended for contaminants by the Joint FAO/WHO Codex Alimentarius Commission. Second Series. CAC/FAL, Rome, 1984:3: 1–8. Fleeger, J. W., Carman, K. R. and Nisbet, R. M. (2003). Indirect effects of aquatic contaminants in aquatic ecosystem. Sci. Total Environ, 2003:317(1): 207-233 Kotze, P. Du., Preez, H. H. and J. H. J. Van Vuren. Bio-accumulation of copper and zinc in Oreochromis mossambicus and Clarias gariepinus from the Olitants River, Mpumalanga, South Africa. Water S.A, 1999: 25 (1):99-110. United States Environmental Protection Agency (USEPA). Biological indicators of watershed health. Available at http://www.epa.gov/ Last modified January, 1987. D. S., Becker, C. E. and Smith, A. H. Chronic low-level lend exposure: its role in the pathogenesis of hypertension. Medical Toxicology, 1987: 2: 210-232. 7/17/2015
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