Northern shrimp (Pandalus borealis) in the Norwegian Deep and Skagerrak, 1984-2017

The survey data consist of: 1) one time series from 1984-2002 (October/November) using R/V Michael Sars and the Campelen-trawl; 2) a point estimate for 2003 (October) as R/V Michael Sars was taken out of service and substituted with R/V Håkon Mosby, whose winches at that time were not powerful enough for the Campelen-trawl, resulting in the survey being conducted with the Shrimp trawl 1420; 3) a start of a potential new time series as the survey in both 2004 and 2005 was conducted in May/June with R/V Håkon Mosby using the standard Campelen trawl; and 4) one time series from 2006 until present (January/February), using R/V Håkon Mosby and the Campelen trawl. From 2017 R/V Håkon Mosby has been substituted with R/V Kristine Bonnevie. In 2016, there were technical problems with the survey trawl (unequal wire lengths of the trawl gear) and this year’s data are considered to be non-representative of the stock status.本调查数据集包含以下四部分：1）1984年至2002年（10月/11月）的一套时间序列数据，调查使用“迈克尔·萨斯号（R/V Michael Sars）”科研调查船与坎普伦拖网（Campelen-trawl）开展；2）2003年（10月）的单点估算数据，因“迈克尔·萨斯号（R/V Michael Sars）”退役，由“哈康·莫斯比号（R/V Håkon Mosby）”接替，但该船当时的绞车功率不足以适配坎普伦拖网，故本次调查改用1420型虾拖网（Shrimp trawl 1420）完成；3）潜在新时间序列的起始阶段：2004年与2005年的调查均于5月/6月开展，使用“哈康·莫斯比号（R/V Håkon Mosby）”与标准坎普伦拖网；4）2006年至今（1月/2月）的一套时间序列数据，使用“哈康·莫斯比号（R/V Håkon Mosby）”与坎普伦拖网开展。2017年起，“哈康·莫斯比号（R/V Håkon Mosby）”由“克里斯汀·博纳维号（R/V Kristine Bonnevie）”接替。2016年，调查拖网出现技术故障（拖网装备的钢缆长度不均），该年度的数据被认为无法反映种群资源现状。