Crangon crangon in the Sylt Rømø bight in 2014@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（North Sea）与瓦登海（Wadden Sea）的温度格局发生显著变化，2007年正式启动叙尔特-勒姆湾（Sylt Rømø Bight，简称SRB）鱼类调查项目，计划至少持续十年。 本项目旨在调查瓦登海的鱼类区系，重点关注其洄游行为、物种组成与摄食习性的动态变化。 在SRB内部共设置7个采样站位，每月开展一次系统采样。另设2个对照站位：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。 采样采用总长17米的小型底拖网：拖网开口宽度7米、高度3米，网翼网目尺寸为36毫米，中部网目尺寸16毫米，囊网（cod end）网目尺寸6毫米。每个站位分别采集水体层与海底层的拖网样品，单次拖网作业时长15分钟，航行速度约2节。 本项目所获调查数据，将有助于更全面细致地刻画瓦登海内部的食物链结构与能量流动机制。