Marine Pollution Department, Environmental Division, National Institute of Oceanography and Fisheries, Alexandria, Egypt.
J Environ Sci Health B. 2013;48(5):402-9. doi: 10.1080/03601234.2013.742719.
The study was undertaken to assess the accumulation of some heavy metals (Cr, Co, Cu, Ni, Zn, Pb and Cd) in different tissues (muscle, gills, heart, liver, brain, bone and skin) of Tilapia nilotica. It is one of the most edible fish species in Egypt and was collected from a commercial fish farm in order to evaluate their potential risk to fishermen and consumers. This fish farm is fed with discharged water containing agricultural, industrial, sewage and domestic wastes. The length-weight relation and condition factor calculation of Tilapia nilotica samples showed a significant linear regression (r(2) = 0.920) and an average condition factor of 4.1 g/cm(3). This indicated that the health status for the studied fish samples was good. Metal pollution index (MPI) values for the determined heavy metals in the different tissues reflected that the muscle was the only tissue that had the lowest content. Provisional Tolerable Weekly Intake (PTWI) values for the investigated heavy metals were lower than those reported for the permissible limits. The data were evaluated by using ANOVA statistical analysis. For appraising the human health risk effects of heavy metals in fish muscle, estimated dietary intake (EDI) and hazard quotient (HQ) were determined. HQ levels indicated that Cr and Co were the only heavy metals among the determined ones that had values more than unity. Also, their relative contributions in fish consumptions were Cr> Co> Pb> Ni> Cu> Cd> Zn. The highest average HQ value of chromium determined in this study referred to the possible adverse effects of Cr on human health. Accordingly, the potential public health risks from dietary exposure to hazardous contaminants in fish species from fish farms must be continually subjected to research, regulation and debate.
本研究旨在评估尼罗罗非鱼不同组织（肌肉、鳃、心脏、肝脏、脑、骨骼和皮肤）中一些重金属（Cr、Co、Cu、Ni、Zn、Pb 和 Cd）的积累情况。它是埃及最常食用的鱼类之一，从商业养殖场中采集，以评估其对渔民和消费者的潜在风险。该养殖场以含有农业、工业、污水和生活废物的排放水为食。尼罗罗非鱼样本的体长-体重关系和条件系数计算显示出显著的线性回归（r²=0.920），平均条件系数为 4.1 g/cm³。这表明研究鱼类样本的健康状况良好。不同组织中确定重金属的金属污染指数（MPI）值表明，肌肉是唯一重金属含量最低的组织。所研究重金属的暂定每周可耐受摄入量（PTWI）值低于报告的允许限值。数据通过方差分析（ANOVA）统计分析进行评估。为了评估鱼类肌肉中重金属对人体健康的风险影响，确定了估计膳食摄入量（EDI）和危害商数（HQ）。HQ 水平表明，Cr 和 Co 是在所确定的重金属中唯一 HQ 值大于 1 的重金属。此外，它们在鱼类消费中的相对贡献为 Cr>Co>Pb>Ni>Cu>Cd>Zn。本研究中 Cr 的平均 HQ 值最高，表明 Cr 对人体健康可能存在不利影响。因此，必须持续对养殖场鱼类中有害污染物的膳食暴露对公众健康的潜在风险进行研究、监管和辩论。
