Larval drift is a key process for successful fish recruitment. We used Norwegian spring-spawning herring (Clupea harengus) as model species to investigate the relationship between larval drift and recruitment. Larval drift indices were derived from simulations based on survey observations between 1993 and 2016. We show that forward simulated larval drift indices have an important positive relation to recruitment success. The relationship demonstrates elevated recruitment when larvae relocate rapidly northwards towards the Barents Sea. Negative or low larval drift indices coincide with only weak recruitment emphasizing limited survival in years with enhanced larval retention. Hence, with this work we combine drift model outcomes refined with survey data indicating that more extensive larval drift is an important component in population dynamics for high-latitude small pelagic fishes. However, larval displacement alone represents only one among many controlling factors but may offer possible predictions of the probability of higher or lower recruitment in the short term. The applicability of the drift indices is adaptable in all world oceans and all marine organisms that occupy planktonic life stages exposed to dynamic ocean currents. The study demonstrates how larval drift indices help to identify larval transport or retention to be crucial for population replenishment.

中文翻译：

---

漂移指数证实，幼体的快速移位对于高纬度海洋的成功招募至关重要

幼虫漂流是成功招募鱼类的关键过程。我们使用挪威春季产卵鲱鱼（Clupea harengus）作为模型物种，以研究幼虫漂移和募集之间的关系。幼虫漂移指数是根据1993年至2016年的调查观测结果从模拟中得出的。我们表明，向前模拟的幼虫漂移指数与招聘成功具有重要的正相关关系。这种关系表明，当幼虫迅速向北移向巴伦支海时，新兵的募集量增加。幼虫漂移指数为负或低，仅与较弱的募集相吻合，强调了在幼虫保留力提高的年份中有限的生存。因此，通过这项工作，我们将漂移模型的结果与调查数据进行了改进，表明更广泛的幼体漂移是高纬度小中上层鱼类种群动态的重要组成部分。但是，仅幼体位移仅代表许多控制因素中的一种，但可能提供短期内更高或更低招募概率的可能预测。漂移指数的适用性适用于所有世界海洋以及在动态海流中处于浮游生命阶段的所有海洋生物。该研究表明，幼体漂移指数如何帮助确定幼体的运输或保留对于补充人口至关重要。单独的幼虫位移仅代表许多控制因素中的一个，但可以提供短期内更高或更低招募概率的可能预测。漂移指数的适用性适用于所有世界海洋以及在动态海流中处于浮游生命阶段的所有海洋生物。该研究表明，幼体漂移指数如何帮助确定幼体的运输或保留对于补充人口至关重要。单独的幼虫位移仅代表许多控制因素中的一个，但可以提供短期内更高或更低招募概率的可能预测。漂移指数的适用性适用于所有世界海洋以及在动态海流中处于浮游生命阶段的所有海洋生物。该研究表明，幼体漂移指数如何帮助确定幼体的运输或保留对于补充人口至关重要。