Determination of heavy metal levels in Oreochromis niloticus and Chrysichthys nigrodigitatus from Ogun River, Nigeria

O. Fafioye, R. Oladunjoye, T. Bamidele, T. Ige
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引用次数: 5

Abstract

Comparison of heavy metal levels in Oreochromis niloticus and Chrysichthys nigrodigitatus caught in Ogun River (Nigeria) was carried out to reveal the potential health risks associated with fish consumption from the river. Concentrations of copper, lead and cadmium were determined in the gills, eyes, bone, flesh, liver and stomach of the fish species. Ten fish of each species were obtained commercially and analyzed for the metals using Atomic Absorption Spectrophotometer. Data obtained were subjected to one-way analysis of variance (ANOVA) at 5% significant level. The highest concentrations of Cu were observed in the gills of O. niloticus and the eyes followed by liver of C. nigrodigitatus, while the lowest concentrations were detected in the eyes of O. niloticus and bone of C. nigrodigitatus. Lead concentrations were higher in the liver of O. niloticus and gills of C. nigrodigitatus, while the lowest concentrations were detected in stomach of O. niloticus and C. nigrodigitatus respectively. Also, in proximate analysis, composition of dry matter, crude protein, crude fat, ash and carbohydrate contents recorded high in C. nigrodigitatus and O. niloticus and significantly differs. All the metals studied exceeded standard permissible limit for human consumption. Therefore, monitoring of the river is highly recommended, while adequate information, education and training should be strengthened to control further pollution.   Key words: Freshwater fish, Africa, contamination, Nile tilapia, catfish.
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奈及利亚奥贡河尼罗鱼和黑影蝶鱼重金属含量测定
对在奥贡河(尼日利亚)捕获的尼罗鱼和黑digitatus Chrysichthys中的重金属含量进行了比较,以揭示与食用该河鱼类有关的潜在健康风险。测定了鱼鳃、眼睛、骨头、肉、肝和胃中铜、铅和镉的浓度。每种鱼各10条,用原子吸收分光光度计分析其金属含量。所得数据在5%显著水平下进行单因素方差分析(ANOVA)。铜含量最高的部位为黑爪螯蟹的鳃和眼睛,其次为肝脏,最低的部位为黑爪螯蟹的眼睛和骨骼。其中,尼罗螯虾肝脏和黑趾螯虾鳃的铅浓度最高,胃和鳃的铅浓度最低。在近似分析中,黑芝麻干物质、粗蛋白质、粗脂肪、灰分和碳水化合物含量均高于黑芝麻,且差异显著。所有被研究的金属都超过了人类消费的标准允许限度。因此,强烈建议对河流进行监测,同时应加强充分的信息、教育和培训,以控制进一步的污染。关键词:淡水鱼,非洲,污染,罗非鱼,鲶鱼
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