The copepod Caligus rogercresseyi is an ectoparasite of several salmonid species. The pumping activity of filter-feeding molluscs could reduce the abundance of copepod dispersive larval stages in the water column. In this research, nauplius II and copepodid larvae of C. rogercresseyi were exposed to filtering mussels (Mytilus chilensis) of different sizes. These mussels were able to filter both larval stages, although they were more efficient in catching nauplius II. The fact that nauplius II were ingested more efficiently could be explained by their smaller size, lower swimming velocity (escape) and longer resting times between movements, when they were exposed to the influx of water around the inhalant area of the mussels. Larger mussels were more effective filtering C. rogercresseyi larvae due to their larger inhalant area and the related water influx. Additionally, the results suggest that larvae captured by the mussels can be incorporated into pseudofaeces or ingested and then released as part of the faeces. Thus, high concentrations of M. chilensis surrounding salmon farms may act as biological barriers, reducing the density of copepod dispersive larval stages and, thus, salmon infestations.

中文翻译：

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以滤食为食的双壳类Mytilus chilensis捕获了罗格斯esse鱼的上层阶段：海虱鱼寄生虫的潜在控制者。

pe足类Caliger rogercresseyi是几种鲑科鱼类的外寄生虫。滤食性软体动物的泵送活动可以减少co足类幼虫在水柱中的丰度。在这项研究中，罗非鱼的无节幼体II和足类幼虫暴露于不同大小的过滤贻贝（Mytilus chilensis）中。这些贻贝能够过滤两个幼体阶段，尽管它们在捕获无节幼体II方面效率更高。当无节幼体II暴露于贻贝吸入区域周围的水流中时，其较小的尺寸，较低的游泳速度（逃逸）和两次运动之间的较长休息时间可以解释其吸收效率更高的事实。贻贝越大，过滤C越有效。rogercresseyi幼虫由于其较大的吸入面积和相关的水涌入。此外，结果表明，贻贝捕获的幼虫可以掺入假粪便中或摄入后作为粪便的一部分释放。因此，鲑鱼养殖场周围高浓度的M. chilensis可能会成为生物屏障，从而降低pe足类幼虫分散幼虫阶段的密度，从而减少鲑鱼的侵扰。