Survey : GEBL/M/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 09/09/1936 and 14/09/1936 on GBligh

Equipment used during this survey :

- Historic Granton otter trawl

Survey operations were undertaken on 25 stations

0 different species were caught on this survey

本调查由Cefas（原渔业局）发起，作为其历史调查项目的一部分。自1902年以来，Cefas在英国周边海域（主要在北海）进行了多次研究调查，收集了站点和生物数据。这些调查的捕捞作业并非如当前国际底拖网调查（IBTS）那样以网格形式系统布置，而是广泛分布于北海的南部和中部区域。由于数据系列具有长期性，因此装备和协议并未在整个过程中标准化。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（如20世纪初），记录了捕获的所有物种，而在其他时期（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（特别是比目鱼）进行。1936年9月9日至9月14日，在GBligh号船上进行了调查。本次调查使用的设备包括：历史悠久的格兰顿海狸拖网。调查在25个站点进行。本次调查共捕获了0种不同的物种。