Physicochemical parameters and heavy metal content of the Cross River at Afikpo North Local Government Area were determined using standard analytical methods. Four sampling stations were selected along the river and sampled during March to October, 2004. Parameters determined include chloride, conductivity, salinity, ammonium ion, turbidity, pH, dissolved oxygen (DO), biological oxygen demand (BOD5) and total hardness as well as concentration of some heavy metals (Fe, Pb, Cd, Cu, Ni and Zn) in both water, fish and sediment samples. Concentration of heavy metals was determined by atomic absorption spectrophotometry while Na and K were estimated by flame photometry. The river was slightly acidic in Station 1 (pH 6.80) and slightly alkaline in Station 4 (pH 7.47). Turbidity ranged from 16 FTU (in Station 4) to 22.0 FTU (in Station1) with a mean value of 19.250 FTU. The dissolved oxygen range of 5.16 (Station 2) to 8.0 (Station 4) ensures the survival of aquatic organisms. Iron was the most abundant metal both in sediment (99.78 mg/kg), fish (11.45 mg/kg) and water (4.85 mg/L). Cadmium had the lowest concentration in water (0.19 mg/kg) while Zn and Ni had the lowest concentrations in fish (0.18 mg/kg) and sediment (1.55 mg/kg), respectively. Generally the heavy metals had significantly higher (p
We present the concentrations of heavy metals (Zn, Cu, Fe, Cr and Cd) estimated in fish species (Nemipterus japonicas and Sardinella longiceps) collected from Ennore, Chennai coast during post monsoon and pre monsoon 2006. Fe and Zn showed the high accumulation in gills of the two fish species during pre monsoon seasons. The concentrations of the five metals were increased during pre monsoon season and decreased during post monsoon season. Heavy metal levels in the analyzed fish species were below the permissible limits and are acceptable for human consumption.