Pelagic Fish at the Barents Sea Polar Front in August 2023

Data as a DwC-A file	download 15 records in English (6 KB) - Update frequency: not planned
Metadata as an EML file	download in English (8 KB)
Metadata as an RTF file	download in English (9 KB)

Description

## Methods### Study areaThis dataset is the result of sampling at nine stations at the Polar Front, in the western part of the Barents Sea. Some stations were sampled twice at different depths.### Time coverageThe samples were collected between 16 August 2023 and 25 August 2023.### Sampling15 pelagic trawl samples were collected with a Harstad pelagic trawl, which has an effective opening of 80 m2 when towed at ca. 3 knots. The mesh size of the inner liner of the cod end was 10 mm. The pelagic trawl was towed at ca. 3 knots for 20-30 min at the target depth and abundances were standardized by converting to catch per unit effort (expressed in kilograms per cubic meter).### Sample analysisAll organisms were identified, when possible to to species level, otherwise to the lowest taxonomic rank possible by visual identification onboard.Capelin had a large size distribution, so individuals similar in length were sorted into approximate size classes (small, medium, and large).The total number and weight of each species was recorded.For large catches, subsamples of 20-30 individuals were taken as a representation of the length distributions of the catch. The standard length, height at the anus (up to the nearest 1 mm), and weight (up to the nearest 0.1 g) were measured for all specimens caught and those in the subsample for abundant species.### Data managementWhile the PolarFront project publishes all its data on Zenodo, biological diversity datasets are also published in the Global Biodiversity Information Facility (GBIF).The data is prepared using the international Darwin Core (DwC) vocabulary (https://dwc.tdwg.org/) and is distributed as DwC text files that follows GBIF's [data quality requirements](https://www.gbif.org/data-quality-requirements-sampling-events) and [best practices for sampling event datasets](https://ipt.gbif.org/manual/en/ipt/latest/best-practices-sampling-event-data).Prior to publishing all data files are validated using GBIF's data validator (https://www.gbif.org/tools/data-validator). Taxonomy is also validated against the [GBIF API](https://techdocs.gbif.org/en/openapi/v1/species) and [World Register of Marine Species](https://www.marinespecies.org).

Data Records

The data in this sampling event resource has been published as a Darwin Core Archive (DwC-A), which is a standardized format for sharing biodiversity data as a set of one or more data tables. The core data table contains 15 records.

1 extension data tables also exist. An extension record supplies extra information about a core record. The number of records in each extension data table is illustrated below.

This IPT archives the data and thus serves as the data repository. The data and resource metadata are available for download in the downloads section. The versions table lists other versions of the resource that have been made publicly available and allows tracking changes made to the resource over time.

Versions

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Rights

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The publisher and rights holder of this work is Akvaplan-niva. This work is licensed under a Creative Commons Attribution (CC-BY 4.0) License.

GBIF Registration

This resource has been registered with GBIF, and assigned the following GBIF UUID: 52296d65-f490-4485-bbb2-ce64554e8de3. Akvaplan-niva publishes this resource, and is itself registered in GBIF as a data publisher endorsed by GBIF Norway.