Survey : GEBL/R/1936 (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 09/12/1936 and 11/12/1936 on GBligh

Equipment used during this survey :

- Historic Granton otter trawl

Survey operations were undertaken on 10 stations

14 different species were caught on this survey

本调查由Cefas（原渔业管理局）发起，作为其历史调查项目的一部分；在自1902年以来由Cefas（前渔业管理局）在英国周边海域（特别是北海）进行的研究调查中收集了站点和生物数据。调查捕获物并非如当前国际底拖网调查（IBTS）中所采用的网格状系统布局，而是广泛分布（尤其是在北海南部和中部地区）。由于该系列数据的长期性，设备和协议并未在整个调查过程中标准化。调查在每个季节均有所进行。两次世界大战期间的数据缺失。在某些时期（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（特别是比目鱼）。1936年12月9日至1936年12月11日，在GBligh号船上进行了调查。本次调查使用的设备包括：历史性的格兰顿海獭拖网。调查在10个站点进行。本次调查共捕获了14种不同的物种。