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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 (dataset in review)

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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 2020. The survey area was from the coast, over the shelf edge and into the deep-water basins south of Iceland and in the southern part of the Irminger Sea, defined as IESSNS strata 6, 11 and 12, see embedded map. The survey period was July 11 – 30, 2020, and samples were collected at 27 trawl stations. 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 27 stations. Trawl depth ranged from surface (trawl headline in surface) to 550 m depth.
All trawl catch was identified to lowest possible taxonomic level, total weight of each species recorded, and length and weight of 50 specimen per species measured, or all if less was caught. For blue whiting (Micromesistius poutassou) more biological measurements are provided such as 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. For the taxa Scyphozoa and Natantia decapods only total catch weight per station is recorded. In total, length measurements are provided for 1383 specimens and weight for 1231 specimen. Each specimen is one row in the dataset file.
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).
Various information is provided about the trawling operation and weather. The data is provided by the Marine and Freshwater Research Institute (MFRI) in Iceland.
Keyword(s):
biological measurements; IESSNS; July 2020; 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 (2020): Fish and invertebrate trawl sampling south and west of Iceland in July 2019. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.918336
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: 61.019112 * Median Longitude: -28.118360 * South-bound Latitude: 57.498000 * West-bound Longitude: -42.611667 * North-bound Latitude: 63.547833 * East-bound Longitude: -15.174000
Date/Time Start: 2020-07-12T00:49:00 * Date/Time End: 2020-07-28T16:58:00
Minimum Elevation: -3761.0 m * Maximum Elevation: -123.0 m
Event(s):
A7-2020_407 * Latitude Start: 62.945500 * Longitude Start: -15.582167 * Latitude End: 62.974833 * Longitude End: -15.588667 * Date/Time Start: 2020-07-12T00:49:00 * Date/Time End: 2020-07-12T01:19:00 * Elevation Start: -1794.0 m * Elevation End: -1797.0 m * Location: Nordic Seas * Campaign: IESSNS_2020 * Basis: Arni Fridriksson * Method/Device: Trawl net (TRAWL)
A7-2020_409 * Latitude Start: 63.547833 * Longitude Start: -17.726333 * Latitude End: 63.532500 * Longitude End: -17.662167 * Date/Time Start: 2020-07-12T17:46:00 * Date/Time End: 2020-07-12T18:16:00 * Elevation Start: -123.0 m * Elevation End: -123.0 m * Location: Nordic Seas * Campaign: IESSNS_2020 * Basis: Arni Fridriksson * Method/Device: Trawl net (TRAWL)
A7-2020_410 * Latitude Start: 62.961167 * Longitude Start: -17.753667 * Latitude End: 62.939500 * Longitude End: -17.715000 * Date/Time Start: 2020-07-12T23:03:00 * Date/Time End: 2020-07-12T23:33:00 * Elevation Start: -1159.0 m * Elevation End: -1159.0 m * Location: Nordic Seas * Campaign: IESSNS_2020 * 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
39AgeAgeaÓlafsdóttir, Anna HOtolith readerAge of fish in years
40MassMasskgÓlafsdóttir, Anna HWeightedTotal weight per species per station
41Number of individualsInd No#Ólafsdóttir, Anna HCounting, visualSpecimen length measured per species per station
42Number of individualsInd No#Ólafsdóttir, Anna HCounting, visualSpecimen aged per species per station
43Number of individualsInd No#Ólafsdóttir, Anna HCounting, visualSpecimen weighted per species per station
44IdentificationIDÓlafsdóttir, Anna HSample identification number (MFRI database)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
49934 data points

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