Sprattus sprattus in the Sylt Rømø bight in 2013@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持续变化，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。本项目旨在调查瓦登海鱼类区系，重点关注其洄游行为、物种组成与摄食习性的变化。在湾内共设置7个采样站位，每月开展一次采样；另增设2个对照站位：1个位于湾外，1个毗邻丹麦边境，每年采样4次。采样作业采用小型底拖网，该拖网总长17米，网口张开宽度7米、高度3米，网翼网目尺寸为36毫米，中部网身16毫米，囊网（cod end）网目尺寸为6毫米。每个站位分别开展一次水层拖捕与一次底层拖捕作业，作业时长均为15分钟，拖曳速度约2节。本项目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。