Agonus cataphractus in the Sylt Rømø bight in 2022

Due to changing temperature regimes in the North- and the Wadden Sea, a fish survey in the Sylt Rømø bight (SRB) was established in 2007 for at least ten years. The aim is to investigate the Wadden Sea fish fauna with special interest in changes of migration behavior, species composition and feeding habits. Since 2021 an assessment of the epibenthic species in the net hauls was included. Seven stations are sampled monthly inside the SRB. Two additional stations, one outside the bight, one close to the Danish border are sampled as references four times a year. For sampling a mini bottom trawl, total length 17 m, trawl opening 7 m, height 3 m with a mesh size of 36 mm in the wings, 16 mm in the mid part and 6 mm in the cod end is used. At every station one haul in the water column and another at the bottom are sampled, for 15 minutes at a speed of approximately 2 knots. The data will help to give a more detailed picture of food chains and energy flows inside the Wadden Sea.鉴于北海与瓦登海的温度格局出现变化，研究团队于2007年在叙尔特-勒姆湾（Sylt Rømø Bight，简称SRB）启动了一项至少持续十年的鱼类调查项目。本项目旨在研究瓦登海鱼类区系，重点关注其洄游行为、物种组成及摄食习性的变化趋势。自2021年起，调查新增了对拖网样品中底上生物（epibenthic species）的评估环节。SRB内部共设7个采样站位，每月开展一次采样；另设2个参照站位，分别位于海湾外侧与丹麦边境附近，每年采样4次。本次调查使用总长17米的小型底拖网，该拖网开口宽度7米、高度3米，网翼网目尺寸为36毫米，中部网目16毫米，囊网网目6毫米。每个站位需分别在水层和海底各完成一次拖网采样，单次作业时长15分钟，航速约2节。本数据集收录的相关数据将有助于更细致地刻画瓦登海内部的食物链与能量流动格局。