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Metadata: Eel survey records from estuaries around England and associated physical and environmental factors 1981-2018
Abstract:
Data explored included long-term catches of eels in transitional and costal waters of England from 1981 to 2018 from the National Fish Populations Database, provided by the EA, from which we filtered data on adult eels in transitional waters as a final file to use in future analyses. The final csv file contains information on data owner, location of the survey site, specific site and survey IDs, survey specific date and associated information, GPS coordinates, survey method, species names, presence/absence data, count data, water body category, estuary name, transitional water body name and RBD name. The file also contains all the physical factors that were extracted from the numerous shapefiles provided by the EA or third parties (e.g. EMODnet Seabed Habitats, ESRI, British Oceanographic Data Centre). For the list of physical factors included please see 'Read Me' file.
Data holder:
Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS)
| Other details | ||
| Internal code | Internally assigned metadata identifier | 10354 |
| 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. | Eel survey records from estuaries around England and associated physical and environmental factors 1981-2018 |
| 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. | CEFAS9f16c10a-feee-4a5b-801e-5d8a6d2ccfed |
| Resource Identifier | This is the code assigned by the data owner. | CEFAS20473 |
| 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 | 1981-01-01 |
| End date | This describes the date the resource ends. This may only be the year if month and day are not known | 2018-12-31 |
| 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. | Data explored included long-term catches of eels in transitional and costal waters of England from 1981 to 2018 from the National Fish Populations Database, provided by the EA, from which we filtered data on adult eels in transitional waters as a final file to use in future analyses. The final csv file contains information on data owner, location of the survey site, specific site and survey IDs, survey specific date and associated information, GPS coordinates, survey method, species names, presence/absence data, count data, water body category, estuary name, transitional water body name and RBD name. The file also contains all the physical factors that were extracted from the numerous shapefiles provided by the EA or third parties (e.g. EMODnet Seabed Habitats, ESRI, British Oceanographic Data Centre). For the list of physical factors included please see 'Read Me' file. |
| Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | This desk-based project has explored available data on eel distribution/abundance in transitional waters of England and associated physical and environmental factors describing those waters at different spatial scales (River Basin District-RBD, estuary and site) to support national eel stock assessment. All data derived for this project came from third parties and are collated under this project for the purposes of future analyses of eel occurrences and/or abundances across different transitional water bodies to advise future data collection programmes and national stock assessment. The eel data in transitional waters were sourced from the National Fish Populations Database (NFPD), which compiles fisheries monitoring surveys performed in England by the EA and third parties. Only data from England transitional waters have been collated and explored to date, however a request was submitted to Natural Resources Wales (NRW) for fish data and adjacent environmental measures from Welsh transitional waters, especially those shared with England (e.g. Severn) and should these become available, they will be integrated into the existing dataset during future analyses. In addition, a request was logged with the EA to obtain the most relevant environmental factors (i.e. water temperature and salinity) measured during WFD fish surveys. Some physical characteristics of each RBD, estuary and survey site were added to the eel survey data. The latitude of the survey site was added as well as the latitude of the centre of the estuary and RBD. The WFD TraC shapefile was used to separate between transitional and coastal data, as investigating coastal eel distribution and abundance was not in the scope of this study (being subjects of future project phases). This shapefile was also used to calculate the extent of each RBD and estuary and to determine which coast each site is exposed to. The WFD river basin shapefile was used in conjunction with the barriers shapefile from the Environment Agency’s Barrier Database to calculate the number of obstructions to eel movement present within each RBD. The ratio between fresh and transitional waters per RBD was calculated using habitat specific wetted areas for the UK from the ICES 2019 WGEEL report. Seabed habitat and substrate data were collected from the EMODnet Seabed Habitats and the bathymetry map was provided by the British Oceanographic Data Centre. Other geographical information such as Euclidean distance to the nearest coast and distance from the Sargasso Sea were also calculated for each survey site. For determining the distance from each survey site to the coast, a shapefile from ESRI countries shapefile was used to define the coastline. The distance to the Sargasso sea was measured to a point in the centre of the Sargasso Sea, the exact extent of which is not clear, but for the purpose of this study a point located at 34°18'25.7"N, 66°16'10.3"W. The classification of drying extent was derived from calculating the percentage of each estuary that is exposed at mean low tide. This was done by using the intertidal shapefile provided by the Environment Agency upon request and the WFD transitional water bodies shapefile (Environment Agency, 2020a) to determine the extent of the intertidal zone. As none of the estuaries in the survey sites become completely desiccated, drying extent was classified into four categories depending on the percentage of the estuary that became exposed (<25, 25–50, 50–75 and >75). Sites and estuaries were classified as either sheltered, semi-exposed or exposed based on the level of exposure to the open sea. Level of exposure was calculated in ArcGis Pro 2.5.0, using a 1.5 km diameter circle and moving it towards the inlet of an estuary until contact was made with the coast at two points. A line was drawn between these two points and waters inside this line were classified as sheltered. A larger, 15 km diameter, circle was used to classify semi-exposed and exposed transitional waters, and this circle was moved towards the coast until the contact was made at two points and a second line was drawn between those two points. Water between the two lines was classified as semi-exposed and the water outside the second line was defined as exposed. The width of the mouth of each estuary was also measured as an indication of accessibility for the European eel and was also used to indicate exposure at estuarine level. Transitional water characterisation already exists for the UK under the WFD and is based on mixing, salinity, tidal range, exposure, depth and substratum type. As this is also a basis for designing fish surveys across different estuaries, WFD classification of transitional water bodies was requested from the Environment Agency and this was added to each survey site as a transitional waterbody type for use in future analyses. |
| Related keywords | ||
| Keyword | General subject area(s) associated with the resource, uses multiple controlled vocabularies | Fish abundance in water bodies |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Estuary | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Coastal environment | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Analysis | |
| 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 | Inapplicable | |
| 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 | 54.5 |
| East | The eastern-most limit of the data resource in decimal degrees | 2 |
| South | The southern-most limit of the data resource in decimal degrees | 50 |
| West | The western-most limit of the data resource in decimal degrees | -6 |
| 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 | Department for Environment, Food and Rural Affairs (DEFRA) | |
| defra.helpline@defra.gov.uk | ||
| Resource locators | ||
| Locator URL | Web address (URL) that links to the resource | https://data.cefas.co.uk/view/20473 |
| 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 | http://standards.iso.org/iso/19139/resources/gmxCodelists.xml#MD_RestrictionCode | |
| 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. | 2020-04-09 |
| Date of last revision | The most recent date that the resource was revised. | 2020-11-12 |
| Date of creation | The date that the resource was created. | 2020-03-30 |
| Harvest date | The date which this record has been (re)harvested from the provider. | 2026-04-19 |
| Metadata date | The date when the content of this metadata record was last updated. | 2020-11-12 |
| 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 |