BGS Hosted Metadata
Seabed temperature readings from the South Georgia Patagonian toothfish longline fishery
This dataset presents temperature readings collected from the waters around South Georgia in the years 2019, 2021, 2023, and 2024. From 2021 onwards, depth readings are also presented. The data were obtained using temperature loggers affixed to longlines operating in the South Georgia Patagonian toothfish fishery. These in situ measurements were conducted to monitor the water temperatures around South Georgia. The deployment of the temperature loggers was carried out by fishing vessel crew and fisheries observers working on behalf of the Government of South Georgia and the South Sandwich Islands (GSGSSI). The data were collated by the Centre for Environment Fisheries and Aquaculture Science (Cefas).
The collection and analysis of this data series was part-funded by the UK Government Blue Belt Programme in partnership with the Government of South Georgia and the South Sandwich Islands. The procurement of some of the temperature loggers was funded by Argos Froyanes Limited.
Simple
- Date (Creation)
- 2025-08-27
- Date (Revision)
- 2025-08-27
- Date (Publication)
- 2025-08-27
- Date (released)
- 2025-08-27
- Edition
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1.0
- Unique resource identifier
- https://doi.org/10.5285/d7f0e45e-3132-47d7-936b-a27677c1cb14
- Codespace
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doi
- Unique resource identifier
- GB/NERC/BAS/PDC/02084
- Codespace
- Other citation details
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Please cite this item as: Alewijnse, S., Hogg, O., & Readdy, L. (2025). Seabed temperature readings from the South Georgia Patagonian toothfish longline fishery (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/d7f0e45e-3132-47d7-936b-a27677c1cb14
- Credit
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No credit.
- Status
- Completed
- Point of contact
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Organisation name Individual name Electronic mail address Role Centre for Environment Fisheries and Aquaculture Science Alewijnse, Sarah R Author Centre for Environment Fisheries and Aquaculture Science Hogg, Oliver T Author Centre for Environment Fisheries and Aquaculture Science Readdy, Lisa Author NERC EDS UK Polar Data Centre Point of contact
- Maintenance and update frequency
- As needed
- Maintenance note
- Completed
- Theme
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South Georgia
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climate
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depth
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temperature
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toothfish
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- Place
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South Georgia 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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These data are supplied under Open Government Licence v.3
- Use constraints
- Other restrictions
- Other constraints
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None.
- Unique resource identifier
- url
- Codespace
-
url
- Association Type
- Cross reference
- Unique resource identifier
- url
- Codespace
-
url
- Association Type
- Larger work citation
- Spatial representation type
- Text, table
- Language
- English
- Character set
- UTF8
- Topic category
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- Oceans
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- Begin date
- 2019-05-01
- End date
- 2019-08-27
- Supplemental Information
-
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
-
6.18.3
Distributor
- Distributor contact
-
Organisation name Individual name Electronic mail address Role NERC EDS UK Polar Data Centre Distributor
- Distributor format
-
Name Version text/csv
- Units of distribution
-
bytes
- Transfer size
- 538968064
- OnLine resource
-
Protocol Linkage Name WWW:LINK-1.0-http--link
http://ramadda.data.bas.ac.uk/repository/entry/show?entryid=d7f0e45e-3132-47d7-936b-a27677c1cb14 Get Data
- Hierarchy level
- Dataset
- Statement
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Methodology:
A licensed commercial longline fishery for Patagonian toothfish (Dissostichus eleginoides) operates in Subarea 48.3 (South Georgia). Since 2016, temperature loggers have been affixed to all longline deployments, subject to availability of serviceable units, to measure the temperature of the waters around South Georgia. Typically a single logger is affixed per longline, however in some instances where vessels were interested in recording the movement of the line, multiple loggers were affixed to a single line. Some idea of where on the longline the logger was positioned is recorded in the 'logger position' column. Longlines are comprised of multiple magazines; sections with ~1000 fishhooks. In 2019, temperature, maximum depth of the set on which the longline was deployed, taken from the logbooks, and pressure were recorded, but since 2021, logger depth has also been used instead of max. depth, and pressure no longer measured. Data from deployments of the temperature loggers have been matched to positional data stored in the South Georgia Data Portal (closed to the public). Data from 2019-2024 are collated here.
Data collection:
Instrumentation.
Data were recorded using the Star Oddi Starmon TD - https://www.star-oddi.com/products/data-loggers/time-depth-recorder-tdr-starmon
Data quality:
To ensure only in-water temperatures are presented, all data were subset to those measurements taken between the end of the set and the start of the haul. As there is some mismatch between the in-water times in recorded in logbooks and the time on the temperature loggers, further anomalous measurements were removed using a two-stage process:
1. Limits of -1.8°C (the freezing temperature of seawater) and 15°C were used as initial broad cutoffs.
2. Further anomalies were removed using the mean temperature ± 2 times the standard deviation.
Where depth data were available, bottom temperature measurements were selected by removing those shallower than the 75th depth quantile for each line.
Some missing values (NAs) are present:
2019 - Depth was not recorded, however, pressure was recorded on deployments by one vessel.
2024 - Some logger deployments recorded erroneous depths, so these have been removed resulting in NA.
Additionally, data from 2020 are limited due to difficulties with the COVID-19 pandemic which was occurring at the time. Data from 2016-18 and 2022 are still undergoing collation. Where possible these data will be integrated in future updates to this temperature time series.
As these data were collected opportunistically, the sampling interval varies across deployments.
Metadata
- File identifier
- d7f0e45e-3132-47d7-936b-a27677c1cb14 XML
- Metadata language
- English
- Character set
- UTF8
- Hierarchy level
- Dataset
- Hierarchy level name
-
dataset
- Date stamp
- 2025-08-27
- Metadata standard name
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ISO 19115 Geographic Information - Metadata
- Metadata standard version
-
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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