Planktivorous pelagic fish are susceptible to accumulating microplastics (MP), which have the same size range as their prey and accumulate in their feeding and spawning grounds. We analyzed stomach contents of pelagic fish (European sardine, horse mackerel, anchovy, chub mackerel, Atlantic mackerel, and bogue) from Atlanto‐Iberian waters to investigate the relationship between MP ingestion, their diet composition and select a potential bioindicator. We found significant differences between diet of the studied fish species in terms of prey type and size. MP ingestion was significantly related to diet composition. Species with diets that include smaller prey (European sardine, chub mackerel, and bogue) had lower MP concentration in the stomachs than fish depending on larger mesozooplanktonic prey. Horse mackerel had the highest proportion of larger prey (> 1000 μm) and the highest MP abundance in the stomachs, and thus are a suitable bioindicator for MP monitoring in the pelagic Iberian ecosystem.

中文翻译：

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浮游鱼类的微摄入和饮食结构

浮游性中上层鱼类容易积聚微塑料（MP），其大小范围与猎物相同，并会在其觅食和产卵场中积聚。我们分析了来自大西洋-伊比利亚水域的远洋鱼类（欧洲沙丁鱼，竹荚鱼，an鱼，鱼，大西洋鲭鱼和鲍格鱼）的胃内容物，以研究MP摄入与其饮食组成之间的关系，并选择潜在的生物指示剂。我们发现，在猎物类型和大小方面，所研究鱼类的饮食之间存在显着差异。MP摄入与饮食组成显着相关。饮食中包括较小猎物的物种（欧洲沙丁鱼，鲭鱼和博格）与鱼类相比，胃中的MP浓度要低，这取决于较大的中渗动物。 μ m）和最高MP丰度胃，并因此可用于MP在浮游伊比利亚生态系统监测合适的指示生物。