Survey : CORE/12/1973 (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 04/08/1973 and 28/08/1973 on Corella

Equipment used during this survey :

- Historic Granton otter trawl

Survey operations were undertaken on 43 stations

34 different species were caught on this survey

本次调查由英国海洋渔业科学研究所（Cefas，原名渔业局）开展，作为Cefas历史调查项目的一部分。自1902年起，Cefas在环绕英国的海域（尤其是北海区域）进行了多次研究调查，收集了站点和生物数据。与当前的国际底拖网调查（IBTS）不同，调查所获的捕获物并未按照网格系统进行系统性排列，而是广泛分布，尤其在北海的南部和中部地区。由于该数据系列具有长期性，因此在整个调查过程中，所使用的设备和协议并未实现标准化。调查在每年的每个季节都进行了，但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的商业物种（如比目鱼、鳎鱼和鳕鱼）。值得注意的是，某些调查针对特定的物种（尤其是比目鱼）。1973年8月4日至28日，在Corella进行了调查，使用了以下设备：

- 历史悠久的格兰顿海獭拖网

调查操作在43个站点进行，共捕获了34种不同的物种。