Rare fish species in the Sylt Rømø bight in 2014

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（Wadden Sea）的水温格局发生变化，研究团队于2007年在叙尔特-勒姆湾（Sylt Rømø Bight，缩写SRB）启动了一项至少持续十年的鱼类调查项目。本调查旨在探究瓦登海鱼类区系，重点关注其洄游行为、物种组成及摄食习性的变化。该海湾内共布设7个采样站位，每月开展1次采样。另设2个参照站位：1个位于海湾外侧，另1个毗邻丹麦边境，每年开展4次采样。采样采用小型底拖网：该拖网总长度17米，网口宽7米、高3米，网翼网目尺寸为36毫米，网身中部网目16毫米，拖网囊网（cod end）网目6毫米。每个站位分别完成1次水层拖网采样与1次底拖网采样，拖曳时长15分钟，拖曳速度约2节。本调查所获数据将有助于更全面细致地解析瓦登海内部的食物链与能量流动格局。