Gasterosteus aculeatus in the Sylt Rømø bight in 2022

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.

鉴于北海与瓦登海（Wadden Sea）的温度格局持续变化，研究团队于2007年在叙尔特-勒姆湾（Sylt Rømø Bight，简称SRB）设立鱼类调查项目，计划至少持续10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，项目新增了对拖网采集样品中的底上生物（epibenthic species）进行评估的环节。SRB湾内共设7个采样站点，每月开展一次采样；另增设2个参照站点：1个位于湾外，另1个紧邻丹麦边境，每年采样4次。采样采用小型底拖网：整机总长17米，拖网开口宽7米、高3米，网翼部分网目尺寸为36毫米，中部网目尺寸为16毫米，囊网（cod end）网目尺寸为6毫米。每个站点需完成两次采样作业：一次为水层拖网，一次为底拖网，每次拖曳时长15分钟，拖速约2节。本项目采集的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全貌。