This study revealed a previously undocumented association between a teleost and a shark. Atlantic horse mackerel Trachurus trachurus were observed following spiny dogfish Squalus acanthias during 3 consecutive years (2018–2020) on off-shore banks in Kattegat (57°N; 11°E, Sweden). The observations were made by the use of stereo-BRUV (baited remote underwater stereo-video systems). Our findings provide additional information about relationships between sharks and teleosts and suggest that stereo-BRUV can add to the ecological knowledge gained from the commonly deployed trawl surveys in temperate waters such as the Kattegat. With the increasing use of BRUVs in areas where the method has rarely been used before, such as higher latitudes or deeper water, observations as the one described here will likely increase. We urge the growing community of BRUVvers to make use of the methods full potential and to share not only estimations of abundance of different species but also observations of species associations and behaviors. These observations are important for better understanding of the interaction between species and could be important knowledge for targeted management measures.

这项研究揭示了硬骨鱼和鲨鱼之间以前没有记录的关联。在多刺角鲨Squalus acanthias之后观察到大西洋竹荚鱼Trachurus trachurus连续 3 年（2018-2020 年）在 Kattegat（57°N；11°E，瑞典）的离岸银行。这些观察是通过使用立体 BRUV（诱饵远程水下立体视频系统）进行的。我们的研究结果提供了有关鲨鱼和硬骨鱼之间关系的更多信息，并表明立体 BRUV 可以增加从温带水域（如 Kattegat）中普遍部署的拖网调查中获得的生态知识。随着在以前很少使用该方法的地区越来越多地使用 BRUV，例如更高的纬度或更深的水域，此处描述的观测结果可能会增加。我们敦促不断壮大的 BRUVvers 社区充分利用这些方法，不仅分享对不同物种丰度的估计，还分享对物种关联和行为的观察。