A tube-feeding model for administering microplastic (MP, Ø=30 μm) spheres to fish larvae was employed to quantify the uptake of hydrophobic organic contaminants (HOCs) into the larval body through a single administration of MP. Polychlorinated biphenyl-153 (PCB-153) was used as a representative HOC that can be sorbed to MP in the sea. Atlantic herring (Clupea harengus) larvae (34-51 days post-hatching) were selected as the animal model. The herring larvae were tube-fed a single load of up to 200 polystyrene or polyethylene MP spheres spiked with ¹⁴C-labelled PCB-153, and the control larvae were tube-fed an isotonic solution without MP. At the time of sampling (24 h post feeding), some larvae had evacuated all MP spheres from the gut, while others still had MP remaining in the gut. In larvae with a significant number of MP spheres still present in the gut, whole-body scintillation counting (including the MP in the gut lumen) showed elevated levels of the tracer compared to those in the control fish larvae. For larvae in which all or almost all MP had been evacuated by the time of sampling, the tracer levels of the whole body were not significantly different compared to those for the control fish larvae. These data indicate that there was no significant transfer of PCB-153 from contaminated MP into fish larvae within a gut-transit time of <24 h. This study suggests that the vector role of MP in HOC uptake and absorption may be minor compared to that of other HOC uptake pathways.

采用给鱼幼虫施用微塑性（MP，Ø= 30μm）球体的管饲模型，通过一次施用MP来量化幼虫体内对疏水性有机污染物（HOC）的吸收。多氯联苯153（PCB-153）被用作代表性的HOC，可以被海洋中的MP吸附。选择大西洋鲱鱼（Clupea harengus）幼虫（孵化后34-51天）作为动物模型。鲱鱼幼虫单管喂食最多200个聚苯乙烯或聚乙烯MP球，掺入^14个将C标记的PCB-153和对照幼虫通过管饲喂入无MP的等渗溶液。采样时（喂食后24小时），一些幼虫从肠道中抽出了所有MP球，而其他幼虫中仍有MP留在肠道中。在肠道中仍然存在大量MP球的幼虫中，与对照鱼幼虫相比，全身闪烁计数（包括肠道内腔中的MP）显示出较高的示踪剂含量。对于在取样时已将所有或几乎所有MP抽空的幼虫，与对照鱼幼虫相比，整个体内的示踪剂水平没有显着差异。这些数据表明，在小于24小时的肠道转运时间内，没有将PCB-153从受污染的MP转移到鱼幼体中。