Rashed M N
Chemistry Department, Faculty of Science, Aswan, Egypt.
Environ Int. 2001 Jul;27(1):27-33. doi: 10.1016/s0160-4120(01)00050-2.
Lake ecosystems are, in particular, vulnerable to heavy metal pollution. Tilapia nilotica is one of the aquatic organisms affected by heavy metals. Therefore, heavy metals Co, Cr, Cu, Fe, Mn, Ni, Sr and Zn were determined in different tissues of T. nilotica (ages 1, 1.5, 2, 2.5 and 3 years), which include the muscle, gill, stomach, intestine, liver, vertebral column and scales, to assess the fish pollution with heavy metals. In addition, the study was extended to determine these elements in the aquatic plant (Najas armeta), sediment and water of Khor E1-Ramel in Nasser Lake (Egypt). The study showed that of all the fish parts, fish liver accumulated the highest levels of Cu and Zn. Manganese presented in the intestine and stomach in the highest concentration. Scales exhibited the highest levels of Co, Cr, Ni and Sr, while the gill and vertebral column contains the lowest level of the studied elements. Heavy metals in different parts of T. nilotica differ with the fish growth and extraction rate of these elements from sediment, aquatic plant and lake water. Heavy metals under study in the edible parts of the investigated fish were in the safety permissible levels for human uses.
湖泊生态系统尤其容易受到重金属污染的影响。尼罗罗非鱼是受重金属影响的水生生物之一。因此，对尼罗罗非鱼（年龄分别为1、1.5、2、2.5和3岁）的不同组织（包括肌肉、鳃、胃、肠、肝脏、脊柱和鳞片）中的重金属钴、铬、铜、铁、锰、镍、锶和锌进行了测定，以评估鱼类受重金属污染的情况。此外，该研究还扩展到测定埃及纳赛尔湖科尔·埃尔-拉梅尔的水生植物（阿梅塔茨藻）、沉积物和水中的这些元素。研究表明，在鱼类的所有部位中，鱼肝中铜和锌的积累水平最高。锰在肠和胃中的浓度最高。鳞片中钴、铬、镍和锶的含量最高，而鳃和脊柱中所研究元素的含量最低。尼罗罗非鱼不同部位的重金属含量随鱼类生长以及这些元素从沉积物、水生植物和湖水中的摄取率而有所不同。所调查鱼类可食用部位中所研究的重金属含量处于人类食用的安全允许水平。
