Gelatinous Zooplankton in Gotland, Sweden, 2022

Video footage from seagrass meadows around Gotland, originally collected in 2022 to study seagrass-associated fish, was reanalyzed to estimate jellyfish (Aurelia aurita) abundance. Footage was obtained at six sites using a GoPro HERO 5 Black camera towed horizontally over seagrass-dominated soft bottoms at depths of 2.1–6.9 m. The camera, positioned 80–100 cm above the seafloor, captured transects 55 m in length during morning and evening sessions. Sixty transects were recorded, 10 transects per site, with video durations averaging 4 minutes. Jellyfish abundance was estimated by calculating the volume of water filmed, modeled as a triangular prism based on the camera’s field of view and orientation (perpendicular or tilted 70°). Additional measurements included surface and bottom temperatures, as well as wind speed and direction, retrieved from external sources. Full calculation details are provided in the associated paper, Luskow et al 2025.

2022年最初为研究海草伴生鱼类而收集的哥特兰岛周边海草草甸视频素材，被重新分析以估算海月水母（Aurelia aurita）的丰度。研究人员使用GoPro HERO5 Black相机在六个站点获取视频：相机于水深2.1–6.9米处沿海草主导的软底水平拖行，距海底80–100厘米，在早晚时段拍摄长度为55米的样线（transect）。共记录60条样线，每个站点10条，视频平均时长4分钟。水母丰度通过计算拍摄的水体体积来估算，该水体基于相机视野及方向（垂直或倾斜70°）建模为三棱柱。其他测量数据包括表层与底层温度、风速及风向，均来自外部数据源。详细计算方法见相关论文Luskow et al 2025。