Lead and Zinc Concentrations in the Gill, Liver and Parasito-Fauna of Sarotherodon melanotheron iIn Makoko Lagoon, Lagos State, Nigeria

Abstract

Morphometric and meristic features, metal accumulation and chemical composition of Sarotherodon melanotheron and its intestinal parasites were investigated in August, 2013. The Standard length of Sarotherodon melanotheron range between 13.10-21.50 cm with Mean ± SD of 16.15 ± 1.97, (p<0.001) and Head length range from 1.50-2.70 with Mean ± SD of 2.15 ± 0.28, (p<0.001). Heavy metal concentrations were determined in water, sediment, intestinal parasites, gills and liver of Sarotherodon melanotheron were analysed using Atomic Absorption Spectrophotometry to determine concentration of Pb and Zn. Metals in the water, sediment and parasites were above WHO level. The concentration of Lead and Zinc were higher in the sediment (Pb-18.82 and Zn-21.52) than the water (Pb-2.66 and Zn-15.41). The liver accumulated highest concentration of Lead and Zinc than the gill and parasite. The trend of lead accumulation was; gill (0.86)

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尼日利亚拉各斯州Makoko泻湖黑齿龙鳃、肝脏和寄生动物群中的铅和锌浓度

2013年8月对黑素异齿沙罗齿(Sarotherodon melanotheron)及其肠道寄生虫的形态计量学、分分体特征、金属积累和化学成分进行了研究。标准长度为13.10 ~ 21.50 cm，平均±SD为16.15±1.97，(p<0.001);头长为1.50 ~ 2.70 cm，平均±SD为2.15±0.28，(p<0.001)。采用原子吸收分光光度法测定水体、沉积物、肠道寄生虫、鱼鳃和肝脏中的重金属含量。水中、沉积物和寄生虫中的金属含量高于世界卫生组织的水平。沉积物中铅和锌的浓度(Pb-18.82和Zn-21.52)高于水体(Pb-2.66和Zn-15.41)。肝脏累积的铅和锌浓度高于鳃和寄生虫。铅积累趋势为;鳃(0.86)<寄生(0.98)<肝脏(3.54)。这种积累在锌样品中也有类似的趋势，锌的平均浓度;寄生虫;(锌)(毫克/升);3.39, p<0.01，鳃;(锌)(毫克/升);肝脏0.72,p<0.01;(锌)(毫克/升);11.04, p < 0.01。鱼类寄生虫，特别是肠道棘头虫和绦虫，积累的重金属浓度明显高于鱼组织或环境中的浓度;因此，它们可以作为重金属污染的生物指标。重要的是继续监测马科泻湖水域、沉积物和鱼类中的重金属浓度，以便评估该地区重金属行为的趋势。

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