Sprattus sprattus in the Sylt Rømø bight in 2011@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.针对北海与瓦登海的温度格局变化，研究团队于2007年在叙尔特-勒姆湾（Sylt Rømø Bight, SRB）启动了一项至少持续十年的鱼类调查。本调查旨在研究瓦登海鱼类区系，重点关注洄游行为、物种组成与摄食习性的动态变化。叙尔特-勒姆湾内部共设7个采样站位，每月开展一次采样；另设2个对照站位：1个位于该海湾外侧，另1个紧邻丹麦国境线，每年开展4次采样。采样采用小型底拖网，其总长度为17米，网口开度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。每个站位分别开展1次水层拖捕与1次底层拖捕，作业时长均为15分钟，拖曳速度约2节。本调查所获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。