Survey : CORE/03/1973 (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 31/01/1973 and 12/02/1973 on Corella

Equipment used during this survey :

- Historic Granton otter trawl

Survey operations were undertaken on 7 stations

11 different species were caught on this survey

本项调查由Cefas（前身为渔业局）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）开展了多次研究调查，收集了相关的站点和生物数据。这些调查的渔获量并非以网格形式系统排列，如当前的国际底拖网调查（IBTS）所采用的布局，而是广泛分布于北海的南部和中部区域。由于该系列数据的长期性质，设备和协议并未在整个调查过程中标准化。调查在每个季节均有所进行，两次世界大战期间的资料缺失。在某些时期（如20世纪初），所有捕获的物种均被记录，而在其他时期（如1920年代至1930年代），仅对关键的商业物种（例如鳎鱼、鳕鱼和鲽鱼）进行了系统记录。值得注意的是，部分调查专门针对特定物种（尤其是鳎鱼）。在1973年1月31日至2月12日间，对Corella进行了调查。此次调查所使用的设备包括：历史性的Granton海豹拖网。调查在7个站点进行，共捕获了11种不同的物种。