Survey : GEBL/82/1924 (part of CEFAS Historic surveys)

This survey was undertaken by Cefas as part of the CEFAS Historic surveys;

Station and biological data collected during research surveys carried out by
Cefas (formerly Directorate of Fisheries) in seas around the UK, mostly in the
North Sea, since 1902. The survey hauls are not laid out systematically as a
grid, as in current International Bottom Trawl Surveys (IBTS) and are widely
distributed over (especially) southern and central North Sea areas. Gears and
protocols were not standardised throughout, due to the long term nature of the
series. Surveys took place in each season. Data are lacking for the periods of
both World Wars. In some periods (e.g. the early 1900s), all species caught
were recorded, whereas in other periods (e.g. 1920s-30s), only the key
commercial species (e.g., Plaice, Sole and Cod) were recorded systematically.
Note that some surveys targeted particular species (notably Plaice).

Survey took place between 16/05/1924 and 22/05/1924 on GBligh

Equipment used during this survey :

- Grimsby style otter trawl Codend with mesh 6.8cm

Survey operations were undertaken on 11 stations

21 different species were caught on this survey

本调查由Cefas（前身为渔业局）实施，作为CEFAS历史调查的一部分。自1902年以来，Cefas在英国周边海域（尤其是北海）进行了研究调查，收集了站点和生物数据。调查的渔获物并非如当前国际底拖网调查（IBTS）那样系统性地布置成网格状，而是广泛分布于北海的南部和中部地区。由于该系列数据的长期性，工具和方法并未实现标准化。调查在各个季节均有所进行。两次世界大战期间的数据缺失。在某些时期（如20世纪初），记录了所有捕获物种，而在其他时期（如1920年代至1930年代），仅系统性地记录了关键商业物种（例如比目鱼、鳎鱼和鳕鱼）。请注意，某些调查针对特定物种（尤其是比目鱼）。1924年5月16日至22日，在GBligh号上进行了调查。本次调查使用的设备包括：- 格里姆斯比式海狸拖网，网眼尺寸为6.8厘米。调查在11个站点进行。本次调查共捕获了21种不同的物种。