Southern mullets (Chelon richardsonii) as a potential biological indicator for mercury pollution in the Walvis Bay lagoon, Namibia

IF 1.1 4区 环境科学与生态学 Q3 MARINE & FRESHWATER BIOLOGY
V. K. Kapula, H. Ndjaula, Stephanus Hamutenya, J. Iitembu
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引用次数: 2

Abstract

Southern mullet Chelon richardsonii is one of the important fish species found in the Walvis Bay lagoon (WBL) that is commercially exploited for local consumption. The southern mullet is, however, exposed to mercury (Hg) found in sediments, which forms part of its diet. This study evaluated the Hg concentration in muscles, stomach content, liver, and gills of C. richardsonii over two years. The Hg concentration was higher in the liver (0.005 mg kg−1) and relatively lower in the gills (0.001 mg kg−1). There were temporal variations in Hg concentration among the tissues; a positive correlation between mean Hg concentration and fish sizes (total length and total weight) was documented in the gills; and a negative correlation for size versus Hg concentration was recorded in the livers, stomach contents, and the muscles of southern mullets. The Hg concentrations of all tissues were below the World Health Organisation (WHO) limit for fish (0.5 mg kg−1), which indicates that it does not pose a human health risk at the current levels. This study’s findings form a baseline for using southern mullets as biological indicators of Hg pollution in WBL. The study also highlights the need for regular monitoring programmes to protect and maintain the ecological characteristics of WBL as per Namibia’s mandates under the Ramsar Convention.
南鲻鱼(Chelon richardsonii)作为纳米比亚沃尔维斯湾泻湖汞污染的潜在生物指标
南部乌鱼Chelon richardsonii是在沃尔维斯湾泻湖(WBL)发现的重要鱼类之一,该泻湖被商业开发用于当地消费。然而,南部的乌鱼暴露在沉积物中的汞中,而汞是其饮食的一部分。这项研究评估了两年来毛滴虫肌肉、胃内容物、肝脏和鳃中的汞浓度。肝脏的汞浓度较高(0.005 mg kg−1),鳃的汞浓度相对较低(0.001 mg kg−2)。组织间汞浓度存在时间变化;鳃中的平均汞浓度与鱼的大小(总长度和总重量)呈正相关;在南方乌鱼的肝脏、胃内容物和肌肉中记录到大小与汞浓度呈负相关。所有组织的汞浓度均低于世界卫生组织(世界卫生组织)对鱼类的限值(0.5 mg kg−1),这表明在目前的水平下,汞不会对人类健康造成风险。这项研究的发现为使用南方乌鱼作为WBL中汞污染的生物指标提供了基线。该研究还强调,根据纳米比亚根据《拉姆萨尔公约》的授权,有必要制定定期监测计划,以保护和维持WBL的生态特征。
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来源期刊
African Journal of Aquatic Science
African Journal of Aquatic Science MARINE & FRESHWATER BIOLOGY-
CiteScore
3.90
自引率
7.10%
发文量
31
审稿时长
>12 weeks
期刊介绍: The African Journal of Aquatic Science is an international journal devoted to the study of the aquatic sciences, covering all African inland and estuarine waters. The Journal publishes peer-reviewed original scientific papers and short articles in all the aquatic science fields including limnology, hydrobiology, ecology, conservation, biomonitoring, management, water quality, ecotoxicology, biological interactions, physical properties and human impacts on African aquatic systems.
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