Survey : GEBL/E/1939 (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 09/03/1939 and 12/03/1939 on GBligh

Equipment used during this survey :

- Otter trawl Codend catch

Survey operations were undertaken on 8 stations

12 different species were caught on this survey

本调查由Cefas（原渔业局）发起，作为CEFAS历史调查的一部分。自1902年以来，Cefas在英国周边海域（主要在北海）进行了研究调查，收集了站点和生物数据。调查的渔获物并非以网格系统有系统地排列，如当前的国际底拖网调查（IBTS）那样，而是在（尤其是）北海南部和中部广泛分布。由于数据系列的长期性质，设备和协议并未在整个调查过程中标准化。调查在每年的每个季节进行。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（特别是比目鱼）。1939年3月9日至3月12日，在GBligh号上进行调查。本次调查使用的设备包括：- 海獭拖网和网囊渔获物。调查在8个站点进行，共捕获12种不同的物种。