Liparis liparis in the Sylt Rømø bight in 2022@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. Since 2021 an assessment of the epibenthic species in the net hauls was included. 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（Wadden Sea）温度格局变化影响，2007年针对叙尔特-勒姆湾（Sylt Rømø Bight，简称SRB）设立了一项鱼类调查项目，计划至少开展十年。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变化。自2021年起，项目新增了网采样品中底表生物（epibenthic species）的评估工作。SRB湾内共设7个采样站位，每月开展一次采样；另设2个参照站位：1个位于湾外，另1个毗邻丹麦边境，每年采样4次。采样采用小型底拖网，总长度17米，网口尺寸7米（宽）×3米（高），网翼部网目尺寸为36毫米，中部为16毫米，囊网（cod end）为6毫米。每个站位分别在水体层与海底各进行一次拖网采样，拖曳时长15分钟，拖曳速度约2节。本项目采集的数据将有助于更细致地解析瓦登海内部的食物链与能量流动格局。