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首页> 外文期刊>ICES Journal of Marine Science >Comment on 'Salmon lice-induced mortality of Atlantic salmon post-smolt during migration in Norway' by Johnsen et al. (2021)
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Comment on 'Salmon lice-induced mortality of Atlantic salmon post-smolt during migration in Norway' by Johnsen et al. (2021)

机译：Johnsen等人在挪威挪威迁移期间大西洋三文鱼患者的“三文治典型的死亡率”评论。 （2021）

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Johnsen et al. (2021) present a model that predicts lice-induced mortality of virtual post-smolt (VPS) Atlantic salmon migrating from 401 Norwegian salmon rivers. An important feature of this model is that the source of lice is farmed salmon. The model predicts lice-induced mortalities exceeding 30% for VPS from 82 rivers, 10-30% for 140 rivers, and less than 10% for 179 rivers. These are high numbers and have contributed to mandatory reductions in the production of farmed salmon in two of the 13 management areas in Norway. In this comment, the model used by Johnsen et al. (2021) is evaluated. Mortality estimates from observed lice numbers on post-smolts caught by trawling in outer fjord areas are compared with the model predicted mortalities for VPS migrating from rivers draining into the corresponding fjords. It is found that Johnsen et al. (2021) systematically overestimates lice-induced mortality for VPS compared to estimates from trawled smolt from corresponding fjords. The present analysis thus contradicts the concluding remark in Johnsen et al. (2021), that: "The estimated lice level on modelled post-smolts is shown to coincide with the level observed on captured wild post-smolt".
机译：约翰森等人。 （2021）展示了一种模型，预测虱子诱导的虚拟后（VPS）大西洋鲑鱼从401挪威鲑鱼河流迁移的大西洋鲑鱼。该模型的一个重要特征是虱子来源是养殖三文鱼。该模型预测虱子诱导的死亡率超过82条河流超过30％，140条河流10-30％，179条河流少于10％。这些都是高的，有助于在挪威的13个管理领域的两名管理领域生产养殖鲑鱼的强制性减少。在此评论中，Johnsen等人使用的模型。 （2021）评估。通过拖拉在外峡湾地区捕获的液体后液体的虱子数量的死亡率估计与预测从河流迁移到相应的峡湾中的VPS迁移的模型预测的死亡率。发现约翰逊等人。 （2021）与来自相应的峡湾的拖拉的喷射的估计系统系统地高估了VPS的虱子诱导的死亡率。因此，目前的分析与约翰逊等人的结论性相矛盾。 （2021），即：“模型后熔渣的估计虱子水平显示在捕获的野生后面观察到的水平相一致”。

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