Microplastic (MP) leads to widespread pollution in the marine ecosystem. In addition to the physical hazard posed by ingestion of microplastic particles, concern is also on their potential as vector for transport of hydrophobic contaminants. We experimentally studied the single and interactive effects of microplastic and pyrene, a polycyclic aromatic hydrocarbon, on the swimming behaviour and predatory performance of juvenile barramundi (Lates calcarifer). Juveniles (18+ days post hatch) were exposed to MPs, or pyrene (100 nM), or combination of both, and feeding rate and foraging activity (swimming) were analysed. Exposure to MPs alone did not significantly influence feeding performance of the juveniles, while a dose-effect series of pyrene showed strong effect on fish behaviour when concentrations were above 100 nM. In the test of combined MP and pyrene exposure, we observed no effect on feeding while swimming speed decreased significantly. Thus, our results confirm that short-time exposure to pyrene impacts the performance of fish juveniles, while additional exposure to microplastic at the given conditions influenced their activity only and not their feeding rate. Further studies of the combined effects of microplastics and pollutants on tropical fish behaviour are encouraged.

微塑料（MP）导致海洋生态系统中的广泛污染。除了摄入微塑料颗粒带来的物理危害外，人们还关注它们作为疏水性污染物运输媒介的潜力。我们通过实验研究了塑料和and（一种多环芳烃）对少年澳洲肺鱼（Lates calcarifer）的游泳行为和掠食性行为的单一和相互作用的影响。）。将幼鱼（孵化后18天以上）暴露于MPs或（（100 nM）或两者的组合下，并分析其摄食率和觅食活动（游泳）。单独暴露于MP并不会显着影响幼鱼的摄食性能，而当浓度高于100 nM时，一系列剂量效应of对鱼的行为表现出强烈影响。在MP和pyr联合暴露测试中，我们观察到游泳速度没有明显降低，但对摄食没有影响。因此，我们的结果证实，短时间暴露于s会影响鱼类幼鱼的性能，而在给定条件下额外暴露于微塑料只会影响其活性，而不会影响其摄食率。鼓励进一步研究微塑料和污染物对热带鱼行为的综合影响。