Survey : GEBL/P/1929 (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 05/10/1929 and 12/10/1929 on GBligh

Equipment used during this survey :

- GRANTON VD TRAWL WITH COD END

Survey operations were undertaken on 12 stations

0 different species were caught on this survey

本次调查由Cefas（前身为渔业管理局）发起，作为CEFAS历史调查的一部分，旨在收集自1902年以来在英国周边海域（尤其是北海）进行的研究调查中的站点和生物数据。与当前的国际底拖网调查（IBTS）不同，这些调查的捕捞数据并非按网格系统系统排列，而是在北海的南部和中部地区广泛分布。由于该系列数据的历史长期性，设备和协议并未在整个调查过程中实现标准化。调查在每个季节都进行。两次世界大战期间的资料缺失。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、鳎鱼和鲭鱼）。值得注意的是，某些调查针对特定物种（尤其是比目鱼）。1929年10月5日至12月12日，在GBligh号上进行了调查。本次调查使用的设备包括：- 格兰特恩VDT型拖网（末端为鲭鱼）。调查在12个站点进行。本次调查共捕获了0种不同的物种。