Survey : CORE/16/1973 (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 06/11/1973 and 18/11/1973 on Corella

Equipment used during this survey :

- Historic Granton otter trawl

Survey operations were undertaken on 14 stations

17 different species were caught on this survey

本调查由Cefas（前身为渔业管理局）发起，作为其历史调查项目的一部分；在1902年以来对英国周边海域，尤其是北海地区进行的科研调查中，收集了站点和生物数据。与当前的国际底拖网调查（IBTS）不同，调查捕获物并非按照网格系统有系统地布置，而是广泛分布于北海的南部和中部区域。由于系列数据的历史性质，工具和方法并未在整个调查过程中实现标准化。调查在每个季节都会进行。两次世界大战期间的数据缺失。在某些时期（例如20世纪初），捕获的所有物种都被记录下来，而在其他时期（例如1920年代至1930年代），仅对关键的商业物种（例如鳎鱼、鳎鱼和鳕鱼）进行了系统记录。请注意，某些调查针对特定的物种进行（特别是鳎鱼）。1973年11月6日至1973年11月18日，在Corella进行了调查。本次调查使用的设备包括：

- 历史性的格兰顿海狸拖网

调查在14个站点进行。本次调查共捕获17种不同的物种。