Clupeidae larvae 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）的温度动态格局发生改变，研究团队于2007年启动叙特-勒姆湾（Sylt Rømø Bight，SRB）鱼类长期调查项目，计划至少持续十年。本项目旨在研究瓦登海鱼类区系（fish fauna），重点关注鱼类洄游行为、物种组成及摄食习性的动态变化。叙特-勒姆湾内设有7个采样站位，每月开展一次常规采样；另增设2个参照站位，分别位于湾外及丹麦边境附近，每年采样四次。本次调查采用小型底拖网（mini bottom trawl）开展采样：该拖网总长度17米，网口有效宽度7米、高度3米，网翼部分网目尺寸为36毫米，中部网身网目尺寸为16毫米，拖网囊网（cod end）网目尺寸为6毫米。每个站位需完成两次采样：一次为水层拖曳采样，一次为底拖曳采样，单次拖曳时长均为15分钟，作业速度约为2节。本项目采集的调查数据，将有助于更精准地刻画瓦登海内部的食物链结构与能量流动过程。