Pholis gunnellus in the Sylt Rømø bight in 2015

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.

受北海与瓦登海水温格局变化影响，研究团队于2007年启动了叙尔特-勒默湾（Sylt Rømø Bight，SRB）鱼类调查项目，计划持续至少十年。本项目旨在调查瓦登海鱼类区系，重点关注鱼类洄游行为、物种组成及摄食习性的动态变化。该海湾内共设7个采样站位，每月开展一次采样；另增设2个对照站位，分别位于海湾外侧及临近丹麦边境区域，每年采样4次。采样作业采用小型底拖网，该拖网总长度17米，网口张开尺寸为7米（宽）×3米（高）；网翼、中部及囊网（cod end）的网目尺寸分别为36毫米、16毫米及6毫米。每个站位分别在水体中层与海底各完成一次拖网采样，拖曳时长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。