Survey : GEBL/77/1924 (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 05/03/1924 and 13/03/1924 on GBligh

Equipment used during this survey :

- Grimsby style otter trawl Codend with mesh 6.8cm

Survey operations were undertaken on 11 stations

10 different species were caught on this survey

本次调查由Cefas发起，作为其历史调查系列的一部分；Cefas（前身为渔业署）自1902年以来在英国周边海域（尤其是北海）进行的科研调查中收集了站点和生物数据。调查的捕捞作业并非如当前国际底拖网调查（IBTS）那样系统性地布局成网格状，而是广泛分布于北海的南部和中部地区。由于数据系列的长期性质，工具和方法并未在整个调查过程中实现标准化。调查在每个季节均有所开展。两次世界大战期间的数据缺失。在某些时期（例如20世纪初），记录了捕获的所有物种，而在其他时期（例如1920年代至1930年代），仅系统地记录了关键的商业物种（例如比目鱼、鳎鱼和鳕鱼）。请注意，某些调查针对特定物种进行（尤其是比目鱼）。1924年3月5日至13日，在GBligh号船上进行的调查中，使用了以下设备：

- 格里姆斯比风格的猎犬式拖网，网目尺寸为6.8厘米。
调查在11个站点进行，捕获了10种不同的物种。