Survey : GEBL/G/1930 (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 24/08/1930 and 29/08/1930 on GBligh

Equipment used during this survey :

- GRANTON VD TRAWL WITH COD END
- peterson young fish trawl

Survey operations were undertaken on 14 stations

27 different species were caught on this survey

本次调查由英国渔业监督局（前身为渔业局）下属的Cefas机构组织实施，作为Cefas历史调查项目的一部分。自1902年起，Cefas在包括北海在内的英国周边海域开展了多次研究调查，其中北海海域的调查尤为集中。与当前国际底拖网调查（IBTS）所采用的网格化系统布局不同，本次调查的捕捞作业并未遵循系统化的网格布局，其分布范围广泛，尤其是北海的南部和中部区域。由于系列数据的长期性，调查过程中使用的设备和协议并未实现标准化。调查活动在各个季节均有开展。两次世界大战期间的数据缺失。在某些时期（例如20世纪初），捕获的所有物种均被记录，而在其他时期（例如1920年代至1930年代），仅对关键商业物种（例如鲽鱼、鳎鱼和鳕鱼）进行了系统的记录。值得注意的是，部分调查针对特定物种（特别是鲽鱼）。1930年8月24日至29日，在GBligh号船上进行的调查中，使用了以下设备：
- GRANTON VD TRAWL WITH COD END
- peterson young fish trawl
调查在14个站点进行，共捕获了27种不同的物种。