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Metadata: Horizontal and vertical movements of Atlantic bluefin tuna tagged with satellite transmitting tags in the South West of the UK
Abstract:
This dataset is derived from the deployments of 63 pop-up satellite archival tags on Atlantic bluefin tuna (Thunnus thynnus) in the western English Channel, off the coast of Wales and in Jersey waters. The tuna were at liberty for up to 730 days before the tags detached. The dataset comprises a number of different files: (i) a summary table giving the deployment details of each tag in the dataset, (ii) the estimated migration paths of each tuna, the ocean region and EEZ within which each daily location falls, plus the average and maximum depth; (iii) the terminal two weeks of the time-series archive from a tuna that was predated by a supposed orca (Orcinus orca). The data were collected as part of the Thunnus UK programme, a collaboration between Cefas and the University of Exeter UK which was funded by the Department for the Environment, Food and Rural Affairs (MF1247) and the European Maritime and Fisheries Fund (ENG2395), Welsh Government (C7986), and the Government of Jersey. Some of the tags used in this study were provided by the International Commission for the Conservation of Atlantic Tuna (ICCAT) and deployed using Thunnus UK funding. Stanford University (USA) and the TAG A Giant programme provided training and support for fieldwork.
Data holder:
Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS)
| Other details | ||
| Internal code | Internally assigned metadata identifier | 30535 |
| Title | The title is used to provide a brief and precise description of the dataset such as 'Date', 'Originating organisation/programme', 'Location' and 'Type of survey'. All acronyms and abbreviations should be reproduced in full. | Horizontal and vertical movements of Atlantic bluefin tuna tagged with satellite transmitting tags in the South West of the UK |
| File Identifier | The File Identifier is a code, preferably a GUID, that is globally unique and remains with the same metadata record even if the record is edited or transferred between portals or tools. | CEFAS00549e3e-156d-4a0f-b619-4c35836b82f9 |
| Resource Identifier | This is the code assigned by the data owner. | CEFAS22088 |
| Resource type | The resource type will likely be a dataset but could also be a series (collection of datasets with a common specification) or a service. | dataset |
| Start date | This describes the date the resource starts. This may only be the year if month and day are not known | 2018-08-01 |
| End date | This describes the date the resource ends. This may only be the year if month and day are not known | 2026-09-23 |
| Frequency of updates | This describes the frequency with which the resource is modified or updated i.e. a monitoring programme that samples once per year has a frequency that is described as 'annually'. | notPlanned |
| Abstract | The abstract provides a clear and brief statement of the content of the resource. | This dataset is derived from the deployments of 63 pop-up satellite archival tags on Atlantic bluefin tuna (Thunnus thynnus) in the western English Channel, off the coast of Wales and in Jersey waters. The tuna were at liberty for up to 730 days before the tags detached. The dataset comprises a number of different files: (i) a summary table giving the deployment details of each tag in the dataset, (ii) the estimated migration paths of each tuna, the ocean region and EEZ within which each daily location falls, plus the average and maximum depth; (iii) the terminal two weeks of the time-series archive from a tuna that was predated by a supposed orca (Orcinus orca). The data were collected as part of the Thunnus UK programme, a collaboration between Cefas and the University of Exeter UK which was funded by the Department for the Environment, Food and Rural Affairs (MF1247) and the European Maritime and Fisheries Fund (ENG2395), Welsh Government (C7986), and the Government of Jersey. Some of the tags used in this study were provided by the International Commission for the Conservation of Atlantic Tuna (ICCAT) and deployed using Thunnus UK funding. Stanford University (USA) and the TAG A Giant programme provided training and support for fieldwork. |
| Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | ABT were captured in waters off England, Wales, and the Channel Islands between 2018 and 2022 by licenced vessels and anglers using heavy tackle, either with trolled lures and J-hooks or dead baits with circle hooks, and brought to the boat as quickly as possible. ABT were brought aboard the fishing vessel, and tags were secured externally using tethers that anchored into the dorsal musculature. Tags were programmed to record data for up to 730 days before detaching and transmitting data to a low earth orbiting satellite system (Argos). A proportion of the tags were either recovered at sea, or were washed ashore and found by beachcombers, and their full data archives downloaded. Tags archived data (depth, temperature, light, and acceleration) at either 5 or 15 second frequency. Movements of tagged animals were reconstructed using light based geolocation software, Wildlife Computers’ Global Position Estimator 3 (GPE3). GPE3 is a space-time discretised Hidden Markov model that uses tag derived observations of ambient light (daily light curves), SST and maximum daily depth. These data are cross referenced with NOAA high resolution SST ( `http://www.esrl.noaa.gov/psd`_) and the ETOPO1 bedrock bathymetric model. The user defined movement speed used for all track reconstructions in GPE3 was 2.5 m.sec-1. Movements reconstructed by the GPE3 provide multiple locations per day, which were averaged (geodesic mean) to provide single daily location estimates for each tag. A detailed description of tag type, fish capture, tag attachment and data analysis can be found in Rudd et al. (2024, freely available at `High-resolution biologging of an Atlantic bluefin tuna captured and eaten by a supposed orca | Scientific Reports`_) and in Horton et al. (2024, freely available at `Annual migrations, vertical habitat use and fidelity of Atlantic bluefin tuna tracked from waters off the United Kingdom | Scientific Reports`_). .. _`http://www.esrl.noaa.gov/psd`: http://www.esrl.noaa.gov/psd .. _`high-resolution biologging of an atlantic bluefin tuna captured and eaten by a supposed orca | scientific reports`: https://www.nature.com/articles/s41598-024-80744-0 .. _`annual migrations, vertical habitat use and fidelity of atlantic bluefin tuna tracked from waters off the united kingdom | scientific reports`: https://www.nature.com/articles/s41598-024-80861-w |
| Related keywords | ||
| Keyword | General subject area(s) associated with the resource, uses multiple controlled vocabularies | Fish behaviour |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Ecology | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Conservation | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Species distribution | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Habitats and biotopes | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Unknown | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Mesopelagic | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Water column | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Marine Environmental Data and Information Network | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | data.gov.uk | |
| Geographical coverage | ||
| North | The northern-most limit of the data resource in decimal degrees | 59 |
| East | The eastern-most limit of the data resource in decimal degrees | 25 |
| South | The southern-most limit of the data resource in decimal degrees | 20 |
| West | The western-most limit of the data resource in decimal degrees | -60 |
| Responsible organisations | ||
| Role | The point of contact is person or organisation with responsibility for the creation and maintenance of the metadata for the resource. | pointOfContact |
| Organisation name | Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS) | |
| Delivery point | Cefas Lowestoft Laboratory, Pakefield Road | |
| Postal code | NR33 0HT | |
| City | Lowestoft | |
| Administrative area | Suffolk | |
| Country | UK | |
| data.manager@cefas.co.uk | ||
| Role | The originator is the person or organisation who created, collected or produced the resource. | originator |
| Organisation name | Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS) | |
| Delivery point | Cefas Lowestoft Laboratory, Pakefield Road | |
| Postal code | NR33 0HT | |
| City | Lowestoft | |
| Administrative area | Suffolk | |
| Country | UK | |
| data.manager@cefas.co.uk | ||
| Role | The custodian is the person or organisation that accepts responsibility for the resource and ensures appropriate care and maintenance. If a dataset has been lodged with a Data Archive Centre for maintenance then this organisation is be entered here. | custodian |
| Organisation name | Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS) | |
| Delivery point | Cefas Lowestoft Laboratory, Pakefield Road | |
| Postal code | NR33 0HT | |
| City | Lowestoft | |
| Administrative area | Suffolk | |
| Country | UK | |
| data.manager@cefas.co.uk | ||
| Role | The distributor is the person or organisation that distributes the resource. | distributor |
| Organisation name | Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS) | |
| Delivery point | Cefas Lowestoft Laboratory, Pakefield Road | |
| Postal code | NR33 0HT | |
| City | Lowestoft | |
| Administrative area | Suffolk | |
| Country | UK | |
| data.manager@cefas.co.uk | ||
| Role | The owner is the person or organisation that owns the resource. | owner |
| Organisation name | Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS) | |
| data.manager@cefas.co.uk | ||
| Role | The owner is the person or organisation that owns the resource. | owner |
| Organisation name | Marine Management Organisation (MMO) | |
| info@marinemanagement.org.uk | ||
| Role | The owner is the person or organisation that owns the resource. | owner |
| Organisation name | Department for Environment, Food and Rural Affairs (DEFRA) | |
| defra.helpline@defra.gov.uk | ||
| Role | The owner is the person or organisation that owns the resource. | owner |
| Organisation name | Welsh Government (Marine Policy Branch) | |
| marineplanning@gov.wales | ||
| Role | The owner is the person or organisation that owns the resource. | owner |
| Organisation name | Government of Jersey | |
| fisheries@gov.je | ||
| Resource locators | ||
| Locator URL | Web address (URL) that links to the resource | https://data.cefas.co.uk/view/22088 |
| Locator name | Name of the web resource | Cefas Data Portal |
| Dataset constraints | ||
| 20.1 Limitations on Public Access - Access constraints | This states `otherRestrictions` from ISO vocabulary RestrictionCode and is an INSPIRE/GEMINI requirement. | otherRestrictions |
| 20.2 Limitations on Public Access - Other constraints | noLimitations | |
| 21.1 Conditions for Access and Use - Use constraints | This states `otherRestrictions` from ISO vocabulary RestrictionCode and is an INSPIRE/GEMINI requirement. | otherRestrictions |
| 21.2 Conditions for Access and Use - Other constraints | https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/ | |
| Available data formats | ||
| Data format | Format in which digital data can be provided for transfer | Binary |
| Format in which digital data can be provided for transfer | Delimited | |
| Format in which digital data can be provided for transfer | Geographic Information System | |
| Version info | ||
| Date of publication | The publication date of the resource or if previously unpublished the date that the resource was made publicly available via the MEDIN network. | 2026-09-01 |
| Date of last revision | The most recent date that the resource was revised. | 2026-09-23 |
| Date of creation | The date that the resource was created. | 2024-11-29 |
| Harvest date | The date which this record has been (re)harvested from the provider. | 2026-09-30 |
| Metadata date | The date when the content of this metadata record was last updated. | 2026-09-23 |
| Metadata standard name | The name of the metadata standard used to create this metadata | MEDIN |
| Metadata standard version | The version of the MEDIN Discovery Metadata Standard used to create the metadata record | 3.1.2 |