Department of Animal Biology and Conservation Science, School of Biological Sciences, University of Ghana, Accra, Ghana.
Biol Trace Elem Res. 2024 Aug;202(8):3781-3788. doi: 10.1007/s12011-023-03943-2. Epub 2023 Nov 7.
The present study investigated the levels of Manganese (Mn), Cadmium (Cd), Copper (Cu), Zinc (Zn), Lead (Pb) and Iron (Fe) in the tissues of a benthic fish (Clarias gariepinus) and a pelagic fish (Oreochromis niloticus), which are highly consumed in Ghana. The fish were collected from the Weija reservoir, which is an important source of fishery and potable water in Accra, Ghana. The results indicate heavy metal accumulation in all the tissues (gills, liver and muscles) analyzed. The bioaccumulation of all the metals was lowest in the muscles compared to the liver and gills in both species. The bioaccumulation of the metals was generally higher in the tissues of the catfish, except for Fe and Zn. Fe was higher in the gills and liver of the tilapia, and Zn was higher in the liver of the tilapia. The analysis of relationships between metal levels in the different tissues and the size of the fish showed a few significant correlations. The results also showed that all metals showed no potential health risk to consumers, as THQs and TTHQs in tilapia and catfish were less than one, and the metal levels in both species were all below the FAO/WHO maximum permissible limits.
本研究调查了在加纳高度消费的底栖鱼类（克拉里鱼）和洄游鱼类（罗非鱼）组织中的锰（Mn）、镉（Cd）、铜（Cu）、锌（Zn）、铅（Pb）和铁（Fe）水平。这些鱼是从威亚水库收集的，威亚水库是加纳阿克拉重要的渔业和饮用水源。结果表明，所有分析的组织（鳃、肝和肌肉）都存在重金属积累。与肝和鳃相比，所有金属在肌肉中的生物累积量均最低，在两种鱼类中均如此。除铁和锌外，这些金属在鲶鱼组织中的生物累积量通常更高。铁在罗非鱼的鳃和肝中含量更高，而锌在罗非鱼的肝中含量更高。对不同组织中金属水平与鱼体大小之间的关系分析表明存在一些显著相关性。结果还表明，所有金属对消费者均无潜在健康风险，因为罗非鱼和鲶鱼的 THQ 和 TTHQ 均小于 1，并且两种鱼类的金属含量均低于粮农组织/世卫组织的最大允许限量。
