Trace elements contamination in the aquatic ecosystem is a current and major environmental concern due to their non-degradable nature and toxic effects on human health. Concentrations of arsenic (As), chromium (Cr), cadmium (Cd) and lead (Pb) in fish were estimated to evaluate contamination levels and health risks for Bangladeshi adults. A total of six demersal fish species namely Mystus vittatus, Polynemus paradiseus, Sillaginopsis panijus, Lates calcarifer, Cynoglossus arel and Pseudapocryptes elongates were collected in summer and winter season from the coastal Karnaphuli River, Bangladesh. The analyzed trace elements varied between different species of fish. The concentration of studied trace elements exceed Food and Agriculture Organization/World Health Organization maximum tolerable intake indicating risk to human body. The mean concentration of As, Cr, Cd and Pb were found 2.18, 9.1, 7.2 and 4.38 times higher than the recommended value. Health risks associated with these trace element intakes were evaluated in terms of dietary intake and target hazard quotients (THQs). The THQs value for individual fish species was more than one which was responsible for non-carcinogenic health hazard due to fish consumption. Target Carcinogenic Risk (TR) value for arsenic and lead was also higher than USEPA standard (10⁻⁴) indicated chronic cancer risk to human. From the health point of view, this study showed that the inhabitants who consume these fishes are exposed chronically to trace elements pollution with carcinogenic and non-carcinogenic consequences.

由于其不可降解的性质以及对人类健康的毒性影响，水生生态系统中的微量元素污染是当前和主要的环境问题。估计鱼类中砷（As），铬（Cr），镉（Cd）和铅（Pb）的浓度可评估孟加拉国成年动物的污染水平和健康风险。共有6种水下鱼类，分别是Mystus vittatus，Polynemus paradiseus，Sillaginopsis panijus，Lates calcarifer，Cynoglossus arel和Pseudapocryptes。是在夏季和冬季从孟加拉国卡纳弗利河沿岸收集的。分析的痕量元素在不同种类的鱼类之间变化。研究的痕量元素的浓度超过了粮食及农业组织/世界卫生组织的最大容许摄入量，表明对人体有危害。发现As，Cr，Cd和Pb的平均浓度比推荐值高2.18、9.1、7.2和4.38倍。根据饮食摄入量和目标危害商（THQs）评估了与这些微量元素摄入量有关的健康风险。单个鱼类的THQs值大于一个，这是由于食用鱼类造成非致癌健康危害的原因。砷和铅的目标致癌风险（TR）值也高于USEPA标准（10 ^-4）表示对人类具有慢性癌症风险。从健康的角度来看，这项研究表明，食用这些鱼类的居民长期暴露于痕量元素污染，并具有致癌和非致癌性。