Myoxocephalus scorpius 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.

受北海与瓦登海（Wadden Sea）水温动态格局变化影响，研究团队于2007年在叙尔特-勒姆湾（Sylt Rømø Bight，以下简称SRB）启动了一项鱼类调查项目，预设研究时长至少十年。本项目旨在调查瓦登海鱼类区系，重点关注鱼类洄游行为、物种组成与摄食习性的动态变化。自2021年起，项目新增了拖网样品中底上栖生物（epibenthic species）的评估环节。SRB海域内共设置7个采样站位，每月开展一次采样；另设2个对照站位，分别位于湾外及邻近丹麦边境的区域，每年采样四次。采样采用小型底拖网：总长度17米，网口跨度7米、高度3米，网翼网目尺寸为36毫米，网身中部网目尺寸为16毫米，拖网囊网（cod end）网目尺寸为6毫米。每个站位分别完成一次水层拖网与一次底拖网采样，单次拖网时长15分钟，作业航速约2节（knot）。本项目采集的数据将有助于更细致地刻画瓦登海海域的食物链与能量流动格局。