Fish and invertebrate trawl sampling south and west of Iceland in July 2021


This data set has trawl catch weight and biological measurements from the latter half of the Icelandic part of the International Ecosystem Summer Survey in Nordic Seas (IESSNS) conducted in July 2021. The survey area was from the coast and over the shelf edge south and west of Iceland, defined as IESSNS strata 5 and 6, see embedded map. The survey period was July 17 – 26, 2021, and samples were collected at 30 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 30 stations. Trawl depth ranged from surface (trawl headline in surface) at 22 stations and 8 stations was trawling deeper in the water column targeting specific acoustic backscatter with trawl depth of 100 – 400 m. 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 taxa Scyphozoa and Natantia decapods only total catch weight per station is recorded.In total, length measurements are provided for 1774 specimens and weight for 1101 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). For detailed information about the survey see the survey report, in Icelandic and abstact, figure and table headings also provided in English. Various information about the trawling operation and weather is included in the file. The data is provided by the Marine and Freshwater Research Institute (MFRI) in Iceland.

MFRI = Marine and Freshwater Research InstituteASFIS 3A = List of Species for Fishery Statistics Purposes (3-alpha) [Food and Agriculture Organization of the United Nations].

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Metadata Access
Creator Ólafsdóttir, Anna H; Pampoulie, Christophe
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 2022
Funding Reference European Commission, 817806
Rights Data access is restricted (moratorium, sensitive data, license constraints)
OpenAccess false
Language English
Resource Type Dataset
Format text/tab-separated-values
Size 62876 data points
Discipline Earth System Research
Spatial Coverage (-30.673W, 62.714S, -15.269E, 65.211N); Nordic Seas
Temporal Coverage Begin 2021-07-17T08:06:00Z
Temporal Coverage End 2021-07-26T01:43:00Z