Microplastics (MPs) are a ubiquitous contaminant worldwide, damaging the environment and human health. These particles have been identified in important seafood species, which are a possible source of contamination for humans and must be investigated. This study therefore aimed to identify the concentrations of microplastics in four important species of bivalves commercialized in Brazilian markets. The presence of microplastics was identified in all bivalves, with an average concentration of 1.64 MPs/g and 10.69 MPs/ind. We concluded that bivalves are a source of microplastics for the Brazilian population. However, further studies must evaluate other species sold in different regions of the country, estimating microplastics ingested by this population through bivalves. Finally, this contamination must be controlled by regulations such as mandatory depuration, in which can effectively minimize this problem.

微塑料 (MPs) 是世界范围内普遍存在的污染物，破坏环境和人类健康。这些颗粒已在重要的海产品中发现，它们可能是人类污染的来源，必须进行调查。因此，本研究旨在确定在巴西市场商业化的四种重要双壳类动物中微塑料的浓度。在所有双壳贝类中都发现了微塑料的存在，平均浓度为 1.64 MPs/g 和 10.69 MPs/ind。我们得出的结论是，双壳贝类是巴西人口的微塑料来源。然而，进一步的研究必须评估在该国不同地区销售的其他物种，估计该种群通过双壳类摄入的微塑料。最后，