BGS Hosted Metadata
KRILLBASE-length frequency database, a compilation of scientific net sampling data on length, sex and maturity stage of Euphausia superba around the Southern Ocean, 1926 to 2016
The KRILLBASE-length frequency database comprises individual length measurements of 613487 Euphausia superba from 6470 scientific net hauls. Some of these individually-measured krill have additional information on their sex and maturity stage. Most of these E. superba are postlarvae, but some of the hauls include small (< 20 mm) krill which likely include furcilia larvae as well as juveniles.
Much of these data were compiled at British Antarctic Survey in 2007 by Mark Jessopp, with additional compilation by Angus Atkinson, Catherine Brewster and Natalie Ensor, and later data checking by Angus Atkinson with Helen Peat. The circumpolar distribution of records is illustrated in the file KRILLBASE_LF_DISTRIBUTION that is available along with this dataset. Examples of uses of KRILLBASE-length frequency are in Atkinson et al. (2009), Tarling et al. (2016), Perry et al. (2019) and Atkinson et al. (2019).
The KRILLBASE-length frequency records were provided by contributing authors of the database or transcribed from the literature or from other institutional databases. At the time of data compilation, data from commercial-size large mesh trawls and from the commercial fishery was also transcribed, providing valuable information on the larger krill caught by these nets. These data are not included in this current KRILLBASE-length frequency database version, because of the difficulty in comparing them with the finer mesh scientific nets compiled here, and because length and population structure are also available in more complete form from CCAMLR.
The KRILLBASE-length frequency database forms a complementary database to the KRILLBASE-abundance database (doi:10.5285/8b00a915-94e3-4a04-a903-dd4956346439), which compiles the abundance of Euphausia superba and salps in the Southern Ocean (Atkinson et al 2017). Both databases are multi-national, circumpolar compilations of net samples spanning years 1926 to 2016. The KRILLBASE-length frequency database uses some of the stations as KRILLBASE-abundance but also additional ones from targeted hauls or horizontal hauls.
Simple
- Date (Creation)
- 2020-04-14
- Date (Revision)
- 2020-04-14
- Date (Publication)
- 2020-04-14
- Date (released)
- 2020-04-14
- Edition
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1.0
- Unique resource identifier
- https://doi.org/10.5285/dfbcbbf9-8673-4fef-913f-64ea7942d97a
- Codespace
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doi
- Unique resource identifier
- GB/NERC/BAS/PDC/01319
- Codespace
- Other citation details
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Please cite this item as: Atkinson, A., Pakhomov, E., Siegel, V., Jessopp, M., Peat, H., Kawaguchi, S., Hill, S., Loeb, V., Hewitt, R., Fielding, S., Tarling, G., Daly, K., Ashjian, C., Chiba, S., Ensor, N., Brewster, C., Watkins, J., Hosie, G., Ichii, T., ... ten Hoopen, P. (2020). KRILLBASE-length frequency database, a compilation of scientific net sampling data on length, sex and maturity stage of Euphausia superba around the Southern Ocean, 1926 to 2016 (Version 1.0) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/dfbcbbf9-8673-4fef-913f-64ea7942d97a
- Credit
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No credit.
- Status
- Completed
- Point of contact
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Organisation name Individual name Electronic mail address Role PML (Plymouth Marine Laboratory), United Kingdom
Atkinson, Angus Author University of British Columbia, Canada
Pakhomov, Evgeny Author Thuenen Institute of Sea Fisheries, Germany
Siegel, Volker Author MaREI Centre, University College Cork, Ireland
Jessopp, Mark Author British Antarctic Survey Peat, Helen Author Australian Antarctic Division
Kawaguchi, So Author British Antarctic Survey Hill, Simeon Author Moss Landing Marine Laboratories, USA
Loeb, Valerie Author Southwest Fisheries Science Center, NOAA/National Marine Fisheries Service, USA
Hewitt, Roger
Author British Antarctic Survey Fielding, Sophie Author British Antarctic Survey Tarling, Geraint Author College of Marine Science, University of South Florida, USA
Daly, Kendra Author Woods Hole Oceanographic Institution, USA
Ashjian, Carin Author JAMSTEC, Japan
Chiba, Sanae Author British Antarctic Survey Ensor, Natalie
Author British Antarctic Survey Brewster, Catherine
Author British Antarctic Survey Watkins, Jonathan L
Author Sir Alister Hardy Foundation for Ocean Science (SAHFOS), United Kingdom
Hosie, Graham Author National Research Institute of Far Seas Fisheries, Japan
Ichii, Taro
Author British Antarctic Survey Gerrish, Laura Author British Antarctic Survey ten Hoopen, Petra Author NERC EDS UK Polar Data Centre Point of contact
- Maintenance and update frequency
- As needed
- Maintenance note
- Completed
- Theme
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Antarctic krill
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Euphausia superba
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KRILLBASE
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length frequency
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- Place
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Southern Ocean
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GEMET - INSPIRE themes, version 1.0
- Access constraints
- Other restrictions
- Other constraints
- no limitations to public access
- Access constraints
- Other restrictions
- Other constraints
- no limitations
- Use constraints
- License
- Other constraints
- Open Government Licence v3.0
- Use constraints
- Other restrictions
- Other constraints
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This dataset is released under Open Government Licence, version 3.0 ().
We ask users of these data to kindly follow these guidelines:
1. Consult all appended files to avoid errors in interpretation. As for KRILLBASE-abundance, KRILLBASE-length frequency is a complex dataset comprising information from a wide variety of net sampling methods. Users are strongly urged to read this Discovery Metadata record and all files accompanying the LENGTH_DATA_20200201 file in order to screen the data appropriately to avoid erroneous conclusions being drawn.
2. Report any errors in the data to the Polar Data Centre at British Antarctic Survey polardatacentre@bas.ac.uk. This will allow us to log these changes and incorporate them into the next version.
3. To cite the data appropriately in any publications by means of its DOI.
- Unique resource identifier
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url
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- Cross reference
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url
- Association Type
- Cross reference
- Spatial representation type
- Text, table
- Language
- English
- Character set
- UTF8
- Topic category
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- Biota
- Environment
- Oceans
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- Begin date
- 1926-12-20
- End date
- 2015-12-07
- Supplemental Information
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It is recommended that careful attention be paid to the contents of any data, and that the author be contacted with any questions regarding appropriate use. If you find any errors or omissions, please report them to polardatacentre@bas.ac.uk.
- Title
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European Petroleum Survey Group (EPSG) Geodetic Parameter Registry
- Date (Publication)
- 2008-11-12
- Cited responsible party
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Organisation name Individual name Electronic mail address Role European Petroleum Survey Group
Publisher
- Unique resource identifier
- urn:ogc:def:crs:EPSG::3031
- Version
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6.18.3
Distributor
- Distributor contact
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Organisation name Individual name Electronic mail address Role NERC EDS UK Polar Data Centre Distributor
- Distributor format
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Name Version image/jpeg text/plain text/csv image/jpeg text/plain text/csv
- Units of distribution
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bytes
- Transfer size
- 17616077
- OnLine resource
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Protocol Linkage Name WWW:LINK-1.0-http--link
http://apex.nerc-bas.ac.uk/f?p=198:1:0 Get Data
- Units of distribution
-
bytes
- Transfer size
- 17616077
- OnLine resource
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Protocol Linkage Name WWW:LINK-1.0-http--link
http://apex.nerc-bas.ac.uk/f?p=198:1:0 Get Data
- Units of distribution
-
bytes
- Transfer size
- 17616077
- OnLine resource
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Protocol Linkage Name WWW:LINK-1.0-http--link
http://apex.nerc-bas.ac.uk/f?p=198:1:0 Get Data
- Units of distribution
-
bytes
- Transfer size
- 17616077
- OnLine resource
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Protocol Linkage Name WWW:LINK-1.0-http--link
https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=dfbcbbf9-8673-4fef-913f-64ea7942d97a Get Data
- Units of distribution
-
bytes
- Transfer size
- 17616077
- OnLine resource
-
Protocol Linkage Name WWW:LINK-1.0-http--link
https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=dfbcbbf9-8673-4fef-913f-64ea7942d97a Get Data
- Units of distribution
-
bytes
- Transfer size
- 17616077
- OnLine resource
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Protocol Linkage Name WWW:LINK-1.0-http--link
https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=dfbcbbf9-8673-4fef-913f-64ea7942d97a Get Data
- Hierarchy level
- Dataset
- Statement
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Methodology:
The sampling information of each component haul is provided in the file named HAUL_METADATA_20200201. This file contains all the net sampling information (for example, net type, sampling depth, when and where the net haul was taken, environmental information etc). In this file, each row refers to a single sampling event (such as a single net haul). This is identified by the unique character string in its 'REF' column. The file README_HAUL_METADATA gives a complete description of each column of the HAUL_METADATA_20200201 file, and needs to be consulted before the data are used.
The file entitled LENGTH_DATA_20200201 contains all the individual measurements of the krill (length, sex and maturity stage, where available) and in this file each row represents one individual krill measured. The file README_LENGTH_DATA provides a description of each column of the LENGTH_DATA_20200201 file. The information in the metadata table and the length table can be linked using the 'REF' column.
The file NET_CODES_20200201 describes the nets in more detail and NET_TRAJECTORY_20200201 describes the types of net haul.
The figure in the file KRILLBASE_LF_DISTRIBUTION describes the circumpolar distribution of records.
Data collection:
Details of nets used are described in the file NET_CODES_20200201, types of net hauls are listed in the file NET_TRAJECTORY_20200201.
Data quality:
Please note that in some of the net hauls, the sampling information is incomplete. All blank fields are absent data, not zeros. In plotting the data against GEBCO bathymetry to determine water depth, it was found that a handful of stations plotted on ice shelves or on land. Water depths for these have been left blank. These may represent rounding errors for positions or incorrect latitudes and longitudes. We transcribed data as they were given to us, accepting the possibility of mistakes or rounding errors in the data. Users of the data are requested to check metadata and all associated files.
Metadata
- File identifier
- dfbcbbf9-8673-4fef-913f-64ea7942d97a XML
- Metadata language
- English
- Character set
- UTF8
- Hierarchy level
- Dataset
- Hierarchy level name
-
dataset
- Date stamp
- 2020-04-14
- Metadata standard name
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ISO 19115 Geographic Information - Metadata
- Metadata standard version
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ISO 19115:2003(E)
- Metadata author
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Organisation name Individual name Electronic mail address Role NERC EDS UK Polar Data Centre Point of contact
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