Microplastics (MPs) in the gastrointestinal (GI) tracts of the five fish species from the Kollidam and Vellar rivers of Tamil Nadu, Southern India were evaluated. A total of 315 MPs were isolated from GI tracts of 23 fishes (Chanos chanos, Chanda nama, Chelon macrolepis, Carangoides malabaricus and Gerrus filamentosus) sampled from both rivers. MPs ranged from 109 to 129 μm (119 ± 79.7) and 181 to 284 μm (122 ± 92.6) in size, with fibres (85.7%) and fragments (14.3%) being the most common ones in the fishes from Kollidam and Vellar river, respectively. The colour pattern of ingested MPs was dominated by blue, transparent, red, yellow and black in collected fishes from both rivers. In this study, MPs were higher in fishes with omnivore feeding habits due to their broad diet habits. Moreover, urban wastes, fishing and agricultural activities are the possible primary sources of MPs in both rivers.

对来自印度南部泰米尔纳德邦 Kollidam 和 Vellar 河的五种鱼类胃肠道 (GI) 中的微塑料 (MP) 进行了评估。从两条河流采样的 23 条鱼（Chanos chanos、Chanda nama、Chelon macrolepis、Carangoides malabaricus 和 Gerrus filamentosus）的胃肠道中分离出总共 315 个 MP。MP 的大小范围为 109 至 129 μm（119 ± 79.7）和 181 至 284 μm（122 ± 92.6），其中纤维 (85.7%) 和碎片 (14.3%) 是 Kollidam 和 Vellar 河鱼类中最常见的， 分别。从两条河流收集的鱼中摄入的 MPs 的颜色模式以蓝色、透明、红色、黄色和黑色为主。在这项研究中，MPs 在具有杂食性摄食习惯的鱼类中更高，因为它们的饮食习惯广泛。此外，城市垃圾，