Not logged in
PANGAEA.
Data Publisher for Earth & Environmental Science

Ólafsdóttir, Anna H; Pampoulie, Christophe (2020): Fish and invertebrate trawl sampling south and west of Iceland in July 2019. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.918336 (dataset in review)

Show MapGoogle Earth

Abstract:
This data set has trawl catch weight and biological measurements from the 2nd leg of the Icelandic part of the International Ecosystem Summer Survey in Nordic Seas (IESSNS) conducted in July 2019. The survey area was from the coast, over the shelf edge and into the deep-water basins south and west of Iceland, defined as IESSNS strata 5, 6, and 12, and stratum boundaries (black solid line) are displayed on attached map "IESSNS 2019.png". The survey period is July 16 - 28 2019, and samples were collected at 34 trawl stations (blue symbol on attached map). A specifically designed scientific trawl, called Multpelt832 (ICES, 2013a-b, Valdemarsen et al 2014) with cod-end mesh size of 50 mm, was used at all 34 stations. Trawl depth ranged from surface (trawl headline in surface) to 370 m depth. All trawl catch was identified to lowest possible taxonomic level, total weight of each species recorded and length of 20-50 specimen per species measured.
For blue whiting (Micromesistius poutassou) more biological measurements are provided such as weight, sex, maturity, age, and stomach weight. For age determination, the otolith was extracted whole from the blue whiting at sea and read whole under a dissecting microscope on land by an experienced age reader part of the ICES framework. Gonad maturity stage was visually estimated at sea during sampling by an experienced technician. The maturity stages are 1-7, where 1 is immature, 2 is beginning to mature or beginning to recovering from previous spawning event, 3 is maturing, 4 is maturing, 5 is getting fully mature, 6 is spawning, and 7 has finished spawning.
In total, measurements are provided for 857 specimen. Each specimen is one row in the dataset file. Ten specimen, at eight stations (352, 354, 361, 366, 375, 383, 388, 391) were not length measured but are included and total weight of catch per taxon or species per station is provided. Information for three pelagic fish species is excluded from the data set and these species are mackerel (Scomber scombrus), herring (Clupea harengus) and lump fish (Cyclopterus lumpus). For detailed information about the survey, see the survey report (in English): https://www.hafogvatn.is/is/midlun/utgafa/haf-og-vatnarannsoknir/results-of-the-icelandic-part-of-the-international-ecosystem-summer-survey-in-nordic-seas-iessns-in-2019-on-rv-arni-fridriksson-hv-2019-57. Various information is provided about the trawling operation, weather, position, date and time. The data are provided by the Marine and Freshwater Research Institute (MFRI) in Reykjavik, Iceland.
Keyword(s):
biological measurements; IESSNS; July 2019; mesopelagic fish; mesopelagic invertebrates; Northeast Atlantic; trawl catch
Related to:
International Council for the Exploration of the Sea (ICES) (2013): Report of the Working Group on Improving Use of Survey Data for Assessment and Advice (WGISDAA). Marine Institute, Dublin, Ireland. ICES CM 2013/SSGESST:07, 22 pp., http://ices.dk/sites/pub/Publication%20Reports/Expert%20Group%20Report/EOSG/2018/WGISDAA/WGISDAA%20Report%202018.pdf
International Council for the Exploration of the Sea (ICES) (2013): Report of the Workshop on Northeast Atlantic Mackerel monitoring and methodologies including science and industry involvement (WKNAMMM). ICES Headquarters, Copenhagen and Hirtshals, Denmark. ICES CM 2013/SSGESST:18, 33 pp., http://www.ices.dk/sites/pub/Publication%20Reports/Expert%20Group%20Report/SSGESST/2013/WKNAMMM13.pdf
Ólafsdóttir, Anna H; Pampoulie, Christophe (2020): Fish and invertebrate trawl sampling south and west of Iceland in July 2018. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.915969
Ólafsdóttir, Anna H; Pampoulie, Christophe (2021): Fish and invertebrate trawl sampling south of Iceland and in southern Irminger Sea in July 2020. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.930437
Valdemarsen, J W; Jacobsen, J A; Óskarsson, Guomundur J; Utne, Kjell Rong; Einarsson, H A; Sveinbjörnsson, Sveinn; Smith, L; Zachariassen, K; Nøttestad, Leif (2014): Swept area estimation of the North East Atlantic mackerel stock using a standardized surface trawling technique. Working Document (WD) to ICES WKPELA, 14 pp.
Funding:
European Commission (EC), grant/award no. 817806: Sustainable management of mesopelagic resources
Coverage:
Median Latitude: 62.548193 * Median Longitude: -21.056786 * South-bound Latitude: 60.584500 * West-bound Longitude: -30.400500 * North-bound Latitude: 64.216833 * East-bound Longitude: -15.142667
Date/Time Start: 2019-07-16T23:12:00 * Date/Time End: 2019-07-28T16:34:00
Minimum Elevation: -2540.0 m * Maximum Elevation: -116.0 m
Event(s):
A8-2019_350 * Latitude Start: 60.584500 * Longitude Start: -15.665833 * Latitude End: 60.585000 * Longitude End: -15.723833 * Date/Time Start: 2019-07-16T23:12:00 * Date/Time End: 2019-07-16T23:42:00 * Location: Nordic Seas * Campaign: IESSNS_2019 * Basis: Arni Fridriksson * Method/Device: Trawl net (TRAWL)
A8-2019_351 * Latitude Start: 60.697333 * Longitude Start: -18.016167 * Latitude End: 60.682667 * Longitude End: -18.072167 * Date/Time Start: 2019-07-17T07:05:00 * Date/Time End: 2019-07-17T07:35:00 * Elevation Start: -2540.0 m * Elevation End: -2526.0 m * Location: Nordic Seas * Campaign: IESSNS_2019 * Basis: Arni Fridriksson * Method/Device: Trawl net (TRAWL)
A8-2019_352 * Latitude Start: 60.791000 * Longitude Start: -20.417667 * Latitude End: 60.784333 * Longitude End: -20.480500 * Date/Time Start: 2019-07-17T15:01:00 * Date/Time End: 2019-07-17T15:31:00 * Elevation Start: -2318.0 m * Elevation End: -2326.0 m * Location: Nordic Seas * Campaign: IESSNS_2019 * Basis: Arni Fridriksson * Method/Device: Trawl net (TRAWL)
Comment:
MFRI = Marine and Freshwater Research Institute
ASFIS 3A = List of Species for Fishery Statistics Purposes (3-alpha) [Food and Agriculture Organization of the United Nations].
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEventÓlafsdóttir, Anna H
2CountryCountryÓlafsdóttir, Anna H
3Year of observationYeara ADÓlafsdóttir, Anna H
4Cruise/expeditionExpeditionÓlafsdóttir, Anna H
5Station labelStationÓlafsdóttir, Anna H
6CommentCommentÓlafsdóttir, Anna HTrawl station type (Ptrawl = surface, DeepTrawl = watercolumn)
7GearGearÓlafsdóttir, Anna HSampling platform (Vessel name and registration number)
8DATE/TIMEDate/TimeÓlafsdóttir, Anna HGeocode – Trawl in water
9DATE/TIMEDate/TimeÓlafsdóttir, Anna HGeocode – Trawl out of water
10LATITUDELatitudeÓlafsdóttir, Anna HGeocode – Trawl in water
11LONGITUDELongitudeÓlafsdóttir, Anna HGeocode – Trawl in water
12Latitude 2Latitude 2Ólafsdóttir, Anna HTrawl out of water
13Longitude 2Longitude 2Ólafsdóttir, Anna HTrawl out of water
14Depth, bathymetricBathy depthmÓlafsdóttir, Anna HTrawl in water
15Depth, bathymetricBathy depthmÓlafsdóttir, Anna HTrawl out of water
16Species codeSpec codeÓlafsdóttir, Anna HASFIS 3A
17Taxon/taxaTaxaÓlafsdóttir, Anna H
18Towing speedTowing speedknÓlafsdóttir, Anna HAt tow depth
19Trawling timeTrawl tminÓlafsdóttir, Anna HAt tow depth
20Trawling distanceTrawling disnmiÓlafsdóttir, Anna HAt tow depth
21Trawl vertical openingTrawl v openmÓlafsdóttir, Anna HAt tow depth
22Trawl door horizontal openingTrawl door h openmÓlafsdóttir, Anna HAt tow depth
23Trawl headline depthTrawl headline depthmÓlafsdóttir, Anna HTow begins
24Trawl headline depthTrawl headline depthmÓlafsdóttir, Anna HTow ends
25CodeCodeÓlafsdóttir, Anna HFishing gear type (MFRI code)
26Mesh sizeMesh sizemmÓlafsdóttir, Anna HCodend meshsize
27Sweeps lengthSweeps lmÓlafsdóttir, Anna H
28Wire lengthWire lengthmÓlafsdóttir, Anna HWrap wire length
29Wind speedffm/sÓlafsdóttir, Anna H
30Wind directiondddegÓlafsdóttir, Anna H
31Cloud coverageCloud covÓlafsdóttir, Anna HScale 1 - 8
32Temperature, waterTemp°CÓlafsdóttir, Anna HAt 10 m depth from surface
33Temperature, airTTT°CÓlafsdóttir, Anna HAt sea level
34Pressure, atmosphericPPPPhPaÓlafsdóttir, Anna H
35LengthlcmÓlafsdóttir, Anna HFish measuring board
36Weight, total, wetw tot wetgÓlafsdóttir, Anna HFish, wet weighted
37SexSexÓlafsdóttir, Anna HVisual identification (VID)
38Maturity indexc-pÓlafsdóttir, Anna HVisual identification (VID)Stage 1-6
39Liver, massLiver mgÓlafsdóttir, Anna HWeighted
40Stomach, wet massStom wmgÓlafsdóttir, Anna HWeighted
41AgeAgeaÓlafsdóttir, Anna HOtolith readerAge of fish in years
42MassMasskgÓlafsdóttir, Anna HWeightedTotal weight per species per station
43Number of individualsInd No#Ólafsdóttir, Anna HCounting, visualSpecimen length measured per species per station
44Number of individualsInd No#Ólafsdóttir, Anna HCounting, visualSpecimen aged per species per station
45Number of individualsInd No#Ólafsdóttir, Anna HCounting, visualSpecimen weighted per species per station
46IdentificationIDÓlafsdóttir, Anna HSample identification number (MFRI database)
Size:
30015 data points

Download Data (login required)

Download dataset as tab-delimited text — use the following character encoding:

View dataset as HTML (shows only first 2000 rows)