© OpenStreetMap contributors
- Add External Layer
- Upload Shapefile
- Layer Tutorial
- Close
Use the checkbox () to show or hide a layer.
Use the radio buttons () to select a layer to use with the identify function.
- Layers
- Opacity
Available layers
(ctrl+c)
Search for marine data across UK organisations
- API
- How-To
- About
- Contact MEDIN
- Share
Metadata: Reconstructed annual mean fishing mortality data for 21 important North Sea stocks since 1850
Abstract:
Reconstructed annual mean North Sea fishing mortality 1850-2020 for 21 North Sea stocks. Further details can be found in the README file. Sandeel, Norway pout, sandeel, herring, sole, whiting, plaice, haddock, cod, saithe are data-rich stocks with full ICES assessments. Horse mackerel and mackerel have assessments with lower levels of information behind them; poor cod, dab, long rough dab, lemon sole, witch, grey gurnard, starry ray, cuckoo ray, monkfish are data-poor. Fishing mortality is in reciprocal years (yr-1), being the negative log of the fraction of the stock left after one year of fishing at this intensity. So if 1/4 of the stock was fished out in a year, the mortality would be -log(1 - 1/4) or ~0.29. The relation between the annual harvest rate (H - 25% in the above case) and fishing mortality (F) in reciprocal years is given by: F = - log ( 1 - H )
Data holder:
Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS)
| Other details | ||
| Internal code | Internally assigned metadata identifier | 8992 |
| 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. | Reconstructed annual mean fishing mortality data for 21 important North Sea stocks since 1850 |
| 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. | CEFAS03a925f9-0009-4e39-bb8f-1f06e617003d |
| Resource Identifier | This is the code assigned by the data owner. | CEFAS22118 |
| 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 | 1880-01-01 |
| End date | This describes the date the resource ends. This may only be the year if month and day are not known | 2020-12-31 |
| 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. | Reconstructed annual mean North Sea fishing mortality 1850-2020 for 21 North Sea stocks. Further details can be found in the README file. Sandeel, Norway pout, sandeel, herring, sole, whiting, plaice, haddock, cod, saithe are data-rich stocks with full ICES assessments. Horse mackerel and mackerel have assessments with lower levels of information behind them; poor cod, dab, long rough dab, lemon sole, witch, grey gurnard, starry ray, cuckoo ray, monkfish are data-poor. Fishing mortality is in reciprocal years (yr-1), being the negative log of the fraction of the stock left after one year of fishing at this intensity. So if 1/4 of the stock was fished out in a year, the mortality would be -log(1 - 1/4) or ~0.29. The relation between the annual harvest rate (H - 25% in the above case) and fishing mortality (F) in reciprocal years is given by: F = - log ( 1 - H ) |
| Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | Using 29 mixed fleet segments*, assembled from Scientific, Technical and Economic Committee for Fisheries (EU) (STECF) data, with catchability set to the average for 2002-12 or 1980-2010 we use an average choke constraint to estimate effort and hence mortality for the 21 stocks assuming constant relative catchability and several other assumptions, as described in Thorpe et al., 2025 (in prep). The estimates from the mixed fishery are then used as inputs to EcoEnsemble (Spence et al, 2023) to produce a probabilistic hindcast of fishing mortality since 1880. Spin up from 1850 can be achieved by ramping up Fs at a constant rate per year from 0 or maybe 20% of 1880 levels (personal communication from Poul Holm). * fleet segments are groupings of boats that interact with the set of stocks in a similar manner, such that they can be considered as a single management unit in evaluation of fisheries strategies. |
| Related keywords | ||
| Keyword | General subject area(s) associated with the resource, uses multiple controlled vocabularies | Fisheries |
| 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 | Unknown | |
| 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 | 61.5 |
| East | The eastern-most limit of the data resource in decimal degrees | 8 |
| South | The southern-most limit of the data resource in decimal degrees | 51 |
| West | The western-most limit of the data resource in decimal degrees | -3.5 |
| 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 | ||
| Resource locators | ||
| Locator URL | Web address (URL) that links to the resource | https://data.cefas.co.uk/view/22118 |
| 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/ | |
| 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. | 2025-02-11 |
| Date of last revision | The most recent date that the resource was revised. | 2025-04-30 |
| Date of creation | The date that the resource was created. | 2025-01-30 |
| Harvest date | The date which this record has been (re)harvested from the provider. | 2026-04-12 |
| Metadata date | The date when the content of this metadata record was last updated. | 2025-04-30 |
| 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 | 3.1.1 |