Survey : EHOLT/01/1957 (part of Historic Arctic Survey Series)

This survey was undertaken by Cefas as part of the Historic Arctic Survey
Series;

*Gadus morhua* (Atlantic Cod) stocks in the Barents Sea are currently at
levels not seen since the 1950s. Causes for the population increase last
century, and understanding of whether such large numbers will be maintained in
the future, are unclear. To explore this, we digitised and interrogated
historical cod catch and diet datasets from the Barents Sea. Data includes
temporal and spatial information, cod catch data and length distributions, and
hydrographic data.

Survey took place between 26/02/1957 and 30/03/1957 on Ernest Holt

Equipment used during this survey :

- Otter Trawl 78ft Granton with shrimp netting cover

Survey operations were undertaken on 28 stations

34 different species were caught on this survey

此次调查由Cefas负责，作为历史北极考察系列的一部分；大西洋鳕鱼（Gadus morhua）在巴伦支海的种群数量目前处于自20世纪50年代以来未曾见过的水平。关于上百年间种群数量增加的原因，以及对未来能否维持如此庞大数量的理解尚不明确。为此，我们数字化并分析了巴伦支海历史上的鳕鱼捕捞和食性数据集。数据包括时间、空间信息，鳕鱼捕捞数据和长度分布，以及水文数据。调查于1957年2月26日至3月30日在Ernest Holt号上进行；此次调查所使用的设备包括：78英尺格兰顿式鳕鱼拖网，配备虾网覆盖；调查在28个站点进行；共捕获34种不同的物种。