Survey : SLAN/10/1956 (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 05/06/1956 and 13/06/1956 on Sir Lancelot

Equipment used during this survey :

- peterson young fish trawl

Survey operations were undertaken on 22 stations

29 different species were caught on this survey

本调查由Cefas（原渔业局）发起，作为其历史调查计划的一部分；该调查收集了自1902年以来Cefas（原渔业局）在英国周边海域，尤其是北海地区进行的科研调查中的站点和生物数据。调查捕获物并非按网格系统有规律地布置，如现行国际底拖网调查（IBTS）所做，而是广泛分布在北海的南部和中部区域。由于该数据系列长期性的特性，工具和方法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数据缺失。在某些时期（例如20世纪初），所有捕获的物种均被记录，而在其他时期（例如1920年代至1930年代），仅对关键商业物种（例如鳎鱼、比目鱼和鳕鱼）进行了系统记录。值得注意的是，某些调查专注于特定物种（尤其是鳎鱼）。1956年5月6日至6月13日，在Sir Lancelot号上进行了一次调查。本次调查使用的设备包括：

- Peterson Young鱼拖网

调查在22个站点进行。本次调查共捕获了29种不同的物种。