Survey : PLAT/05/1946 (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 21/05/1946 and 24/05/1946 on Platessa

Equipment used during this survey :

- Otter trawl Codend catch

Survey operations were undertaken on 25 stations

16 different species were caught on this survey

此次调查由Cefas执行，作为CEFAS历史调查项目的一部分；Cefas（前身为渔业局）自1902年起在英国周边海域（尤其是北海）进行了多次研究性调查，收集了站点和生物数据。与当前国际底拖网调查（IBTS）中按网格系统进行的调查不同，这些调查的捕获物分布广泛，尤其是在北海的南部和中部区域。由于该系列数据长期存在，工具和方法并未统一标准化。调查在每年的各个季节进行。两次世界大战期间的数据缺失。在某些时期（如20世纪初），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（例如，鲽鱼、鳎鱼和鳕鱼）。值得注意的是，一些调查针对特定物种（特别是鲽鱼）。1946年5月21日至5月24日，在Platessa进行了调查。本次调查使用的设备包括：

- 水獭拖网网囊捕获物

调查在25个站点进行。本次调查共捕获了16种不同的物种。