Survey : CORE/04/1973 (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 20/02/1973 and 05/04/1973 on Corella

Equipment used during this survey :

- Engels trawl codend catch

Survey operations were undertaken on 6 stations

8 different species were caught on this survey

本项调查由Cefas（原渔业署）发起，作为其历史调查项目的一部分；在1902年以来，Cefas（原渔业署）在英国周边海域（主要在北海）进行的科研调查中，收集了站点和生物数据。与当前国际底拖网调查（IBTS）中系统的网格布局不同，这些调查的捕获量分布广泛，特别是在北海南部和中部区域。由于数据系列的长期性质，整个系列中工具和协议并未标准化。调查在各个季节进行。两次世界大战期间的数据缺失。在某些时期（如20世纪初），捕获的所有物种均被记录，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（例如，鳎鱼、鳎鱼和鳕鱼）。请注意，某些调查针对特定物种（特别是鳎鱼）。1973年2月20日至1973年4月5日在Corella进行的调查中，使用了以下设备：

- Engels trawl codend catch

调查在6个站点进行。此次调查共捕获了8种不同的物种。