In recent years, reports of plastic debris in the gastrointestinal (GI) tract of fish have been well documented in the scientific literature. This, in turn, increased concerns regarding human health exposure to microplastics through the consumption of contaminated fish. Most of the available research regarding microplastic toxicity has focused on marine organisms through direct feeding or waterborne exposures at the individual level. However, little is known about the trophic transfer of microplastics through the aquatic food chain. Freshwater zooplankton Daphnia magna (hereafter Daphnia), and the fathead minnow Pimephales promelas (FHM), are well-known model species used in standard toxicological studies and ecological risk assessments that provide a simple model for trophic transfer. The aim of this study was to assess the tissue translocation, trophic transfer, and depuration of two concentrations (20 and 2000-part ml⁻¹) of 6 μm polystyrene (PS) microplastics particles between Daphnia and FHM. Bioconcentration factors (BCF) and bioaccumulation factors (BAF) were determined. Fluorescent microscopy was used to determine the number of particles in the water media and within the organs of both species. Throughout the five days of exposure, PS particles were only found within the GI tract of both species. The BCF for Daphnia was 0.034 ± 0.005 for the low concentration and 0.026 ± 0.006 for the high concentration. The BAF for FHM was 0.094 ± 0.037 for the low concentration and 0.205 ± 0.051 for the high concentration. Between 72 and 96 h after exposure all microplastic particles were depurated from both species. The presence of food had a significant effect on the depuration of microplastic particles from Daphnia but not for FHM. Based on the low BCF and BAF values for both species, rapid depuration rates, and null translocation of microplastic particles to organs and tissues from the GI tract, there is a low probability that microplastics will bioconcentrate and bioaccumulate under environmental conditions.

近年来，科学文献中已对鱼的胃肠道（GI）中的塑料碎片进行了充分的记录。反过来，这又增加了人们对食用受污染的鱼类对人体健康的微塑料暴露的关注。关于微塑性毒性的大多数可用研究都集中在个体层面上通过直接进食或水源暴露对海洋生物的影响。但是，关于微量塑料通过水生食物链的营养转移知之甚少。淡水浮游动物Daphnia magna（以下简称Daphnia）和黑头min鱼Pimephales promelas（FHM）是在标准毒理学研究和生态风险评估中使用的众所周知的模型物种，为营养传递提供了简单的模型。这项研究的目的是评估两种浓度（20和2000份ml ^-1的组织移位，营养转移和净化））中的水蚤和FHM之间有6μm的聚苯乙烯（PS）微塑料颗粒。确定了生物富集因子（BCF）和生物富集因子（BAF）。荧光显微镜用于确定两种物质在水介质中和器官中的颗粒数量。在整个暴露的五天中，仅在两个物种的胃肠道内发现了PS颗粒。水蚤的BCF在低浓度时为0.034±0.005，在高浓度时为0.026±0.006。低浓度的FHM BAF为0.094±0.037，高浓度的BAF为0.205±0.051。暴露后72至96小时之间，从这两种物种中纯化了所有微塑料颗粒。食物的存在对水蚤中微颗粒的纯化有显着影响，但对FHM却没有影响。