Merlangius merlangus in the Sylt Rømø bight in 2015@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）的温度格局发生变化，叙特-勒默湾（Sylt Rømø Bight，简称SRB）的鱼类调查于2007年启动，计划持续至少十年。本次调查旨在研究瓦登海的鱼类区系，重点关注其洄游行为、物种组成与摄食习性的动态变化。在该湾内共设置7个采样站位，每月开展一次采样作业。另增设2个对照站位：1个位于湾外海域，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：该拖网开口宽度7米、高度3米，网翼网目尺寸为36毫米，中部网目为16毫米，囊网（cod end）网目尺寸为6毫米。每个站位均完成两次采样作业：一次在水体中拖网采样，一次在海底拖网采样，单次拖曳时长15分钟，拖曳速度约为2节。本次调查获取的数据将有助于更细致地刻画瓦登海内部的食物链结构与能量流动格局。