Rare fish species in the Sylt Rømø bight in 2020@en

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. 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水温格局发生变化，锡尔特勒姆湾（Sylt Rømø Bight, SRB）鱼类调查项目于2007年启动，计划至少持续十年。本调查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。该调查在SRB内部布设7个采样站位，每月开展一次采样；另增设2个参考站位，分别位于湾外及丹麦边境附近，每年采样4次。采样采用小型底拖网：总长度17米，拖网开口宽度7米、高度3米，其中网翼网目尺寸为36毫米，中部网目为16毫米，拖网囊网（cod end）网目为6毫米。每个站位分别开展一次水层拖曳采样与一次底层拖曳采样，作业时长15分钟，拖曳速度约为2节。本调查所得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。