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首页> 外文期刊>Environmental Monitoring and Assessment >Assessment of heavy metals in water samples and tissues of edible fish species from Awassa and Koka Rift Valley Lakes, Ethiopia
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Assessment of heavy metals in water samples and tissues of edible fish species from Awassa and Koka Rift Valley Lakes, Ethiopia

机译：埃塞俄比亚Awassa和Koka Rift Valley Lakes的水样和食用鱼类组织中重金属的评估

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摘要

The Ethiopian Rift Valley Lakes host populations of edible fish species including Oreochmmis nilo-ticus, Labeobarbus intermedius and Clarias gariepinus, which are harvested also in other tropical countries. We investigated the occurrence of six heavy metals in tissues of these fish species as well as in the waters of Lake Koka and Lake Awassa. Both lakes are affected by industrial effluents in their catchments, making them ideal study sites. Mercury concentrations were very low in the water samples, but concentrations in the fish samples were relatively high, suggesting a particularly high bioaccu-mulation tendency as compared with the other investigated metals. Mercury was preferentially accumulated in the fish liver or muscle. It was the only metal with species-specific accumulation with highest levels found in the predatory species L. intermedius. Lower mercury concentrations in O. niloticus could be attributed to the lower trophic level, whereas mercury values in the predatory C. gariepinus were unexpectedly low. This probably relates to the high growth rate of this species resulting in biodilution of mercury. Accumulation of lead, selenium, chromium, arsenic and cadmium did not differ between species, indicating that these elements are not biomagnified in the food chain. Values of cadmium, selenium and arsenic were highest in fish livers, while lead and chromium levels were highest in the gills, which could be related to the uptake pathway. A significant impact of the industrial discharges on the occurrence of metals in the lakes could not be detected, and the respective concentrations in fish do not pose a public health hazard.
机译：埃塞俄比亚的裂谷湖拥有许多可食用鱼类，其中包括尼古拉O麦，中间拉贝巴和加里亚皮乌斯，这些鱼类也在其他热带国家收获。我们调查了这些鱼类的组织以及科卡湖和阿瓦萨湖水域中六种重金属的含量。两个湖泊都受到其流域工业废水的影响，使其成为理想的研究场所。水样品中的汞浓度非常低，但鱼样品中的汞浓度相对较高，这表明与其他研究金属相比，其生物累积趋势特别高。汞优先聚集在鱼肝或肌肉中。它是在掠食性中间L. intermedius中发现的唯一一种具有特定物种积累和最高水平的金属。尼罗罗非鱼中较低的汞浓度可归因于较低的营养水平，而掠食性加里氏梭菌中的汞值出乎意料地低。这可能与该物种的高生长速率有关，从而导致了汞的生物稀释。物种之间铅，硒，铬，砷和镉的积累没有差异，表明这些元素在食物链中并未被生物放大。鱼肝中镉，硒和砷的含量最高，而g中的铅和铬含量最高，这可能与摄取途径有关。无法检测到工业排放对湖泊中金属的产生的重大影响，鱼中各自的浓度也没有对公众健康构成危害。

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  • 来源
    《Environmental Monitoring and Assessment》 |2013年第4期|3117-3131|共15页
  • 作者

    Larissa Dsikowitzky; Mesfin Mengesha; Elias Dadebo; Carlos Eduardo Veiga de Carvalho; Sven Sindern;

  • 作者单位

    Leibniz Center for Tropical Marine Ecology (ZMT),FahrenheitstraBe 6,28359 Bremen, Germany,Institute of Geology and Geochemistry of Petroleum and Coal, RWTH Aachen University,LochnerstraBe 4-20,52056 Aachen, Germany;

    University of Bremen, BibliothekstraBe 1,28359 Bremen, Germany;

    College of Natural and Computational Science,Department of Biology, Hawassa University,P.O. Box 5, Hawassa, Ethiopia;

    CBB, Laboratorio de Ciencias Ambientais,Universidade Estadual do Norte Fluminense,Avenue Alberto Lamego, 2000,Campos, RJ 28013-602, Brazil;

    Institute of Mineralogy and Economic Geology,RWTH Aachen University,Wuellnerstrasse 2,52056 Aachen, Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    ethiopian rift valley lakes; heavy metals; bioaccumulation; fish organs; inland fisheries; food safety;

    机译：埃塞俄比亚纵谷湖泊;重金属;生物蓄积鱼器官;内陆渔业;食品安全;

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