Survey : TELL/05/1973 (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 13/04/1973 and 18/04/1973 on Tellina

Equipment used during this survey :

- Otter trawl Codend catch

Survey operations were undertaken on 20 stations

21 different species were caught on this survey

本调查由Cefas（前身为渔业局）发起，作为其历史调查计划的一部分。自1902年以来，Cefas在英国周边海域（尤其是北海）开展了一系列研究调查，收集了站点和生物数据。这些调查的捕捞作业并非如当前国际底拖网调查（IBTS）那样系统性布局成网格状，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，工具和方法并未实现标准化。调查在各个季节均有所开展，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），仅系统性地记录了关键商业物种（例如鳎鱼、比目鱼和鳕鱼）。值得注意的是，某些调查针对特定物种（尤其是鳎鱼）进行。1973年4月13日至4月18日，在Tellina进行了调查。本次调查所使用的设备包括海獭拖网和网囊捕捞。调查在20个站点进行，共捕获了21种不同的物种。