Department of Environmental Sciences, Jahangirnagar University, Dhaka, 1342, Bangladesh.
Laboratory of Environmental Health and Ecotoxicology, Department of Environmental Sciences, Jahangirnagar University, Dhaka, 1342, Bangladesh.
Environ Sci Pollut Res Int. 2024 Jun;31(27):39303-39317. doi: 10.1007/s11356-024-33782-0. Epub 2024 May 30.
The aim of this study was to investigate microplastic (MP) exposure by Nile tilapia (Oreochromis niloticus) in laboratory conditions. A total of 150 tilapia fishes were equally distributed randomly in 15 different glass tanks with five experimental conditions. Observed results depicted that the presence of MPs in different organs was mainly accumulated from the fish feed rather than externally added MPs in the culture tanks. It was also revealed that the gastrointestinal tract (GIT) was found to be the most susceptible to MPs accumulation followed by gills and muscles in order. However, muscle contained the least size of MPs followed by GITs and gills. A statistical test showed significant correlations among the average length and weight of fish with MP exposure. A filamentous shape was found to be dominant in both GITs and gills while fragment shape was dominant in muscles. FTIR results revealed a total of 12 different polymers in the fish of which two polymers (polyvinyl alcohol and ethylene vinyl acetate) were not detected in the feed-only tanks. Polypropylene (PP) and polyethylene terephthalate (PET) were found to be dominant polymers in all the experimental GIT, gills, and muscle organs. FESEM results indicated the presence of different textures including cracks, edges, flakes, scratches, grooves, and adhering particles. EDX results exhibited the presence of Na, Si, K, Ni, Cu, Zn, As, and Cd in the analyzed samples that may pose additional health risks. Thus, this study could act as baseline data for laboratory-based studies of aquaculture species in future research.
本研究旨在探究尼罗罗非鱼（Oreochromis niloticus）在实验室条件下暴露于微塑料（MP）的情况。将 150 条罗非鱼平均随机分配到 15 个不同的玻璃缸中，每个缸有 5 个实验条件。观察结果表明，不同器官中 MPs 的存在主要是由鱼饲料积累而来，而不是由养殖缸中额外添加的 MPs 所致。研究还表明，胃肠道（GIT）是最容易积累 MPs 的器官，其次是鳃和肌肉。然而，肌肉中 MPs 的尺寸最小，其次是 GIT 和鳃。统计检验表明，鱼的平均长度和体重与 MP 暴露之间存在显著相关性。研究发现，GIT 和鳃中的 MPs 主要呈丝状，而肌肉中的 MPs 主要呈碎片状。FTIR 结果显示，在所有实验的鱼中总共发现了 12 种不同的聚合物，其中两种聚合物（聚乙烯醇和乙烯-醋酸乙烯酯）在仅投喂饲料的缸中未被检测到。在所有实验的 GIT、鳃和肌肉器官中，聚丙烯（PP）和聚对苯二甲酸乙二醇酯（PET）被发现是主要的聚合物。FESEM 结果表明，存在不同的纹理，包括裂缝、边缘、薄片、划痕、凹槽和附着颗粒。EDX 结果显示，在分析的样本中存在 Na、Si、K、Ni、Cu、Zn、As 和 Cd，这可能会带来额外的健康风险。因此，本研究可为未来水产养殖物种的实验室研究提供基线数据。
