Survey : CIRO/09/1973 (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 02/11/1973 and 12/11/1973 on Cirolana

Equipment used during this survey :

- Otter Trawl 78ft Granton no cover

Survey operations were undertaken on 19 stations

20 different species were caught on this survey

本调查由Cefas（原渔业局）实施，作为其历史调查项目的一部分。Cefas自1902年以来在围绕英国的海域（尤其是北海）进行了研究调查，收集了站点和生物数据。与当前的国际底拖网调查（IBTS）中系统排列成网格的捕捞作业不同，这些调查的捕捞作业分布广泛，尤其在北海的南部和中部地区。由于该系列数据的长期性质，装备和协议并未在整体上标准化。调查在每年的每个季节进行。两次世界大战期间的资料缺失。在某些时期（例如20世纪初），记录了所有捕获的物种，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，一些调查针对特定物种（尤其是比目鱼）。1973年11月2日至12月12日，在Cirolana进行了调查。此次调查使用的设备包括：- 78英尺长的格兰顿无盖奥特拖网。调查在19个站点进行，捕获了20种不同的物种。