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Metadata: Nephrops underwater TV Surveys in the North Sea (video data and database)
Abstract:
Underwater TV (UWTV) surveys dataset, used as basis of the Nephrops ( Nephropsnorvegicus) assessment to develop fishery independent indicators of stock size, exploitation status and catch advice. The standard methodology involves the use of a sledge mounted camera to film the seabed at a fix grid of stations conducting TV tows for 10 minutes. Data has been collected twice a year between 1997 to 2002 (Spring and Autumn) and once a year since 2003 (autumn). Dataset holds data from two areas of the North Sea (Farn Deeps-FU6 (1996 to 2012) and Botney Gut/Silver Pit-FU5 (2010 to 2012)).
Data holder:
Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS)
Other details | ||
Internal code | Internally assigned metadata identifier | 9291 |
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. | Nephrops underwater TV Surveys in the North Sea (video data and database) |
Alternative title | The purpose of alternative title is to record any additional names by which the dataset may be known. | Nephrops burrow counts |
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. | CEFAS1171372a-92df-4122-8c75-a9b744d2cd47 |
Resource Identifier | This is the code assigned by the data owner. | CEFAS266 |
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 | 1996 |
End date | This describes the date the resource ends. This may only be the year if month and day are not known | 2012-09-18 |
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'. | annually |
Abstract | The abstract provides a clear and brief statement of the content of the resource. | Underwater TV (UWTV) surveys dataset, used as basis of the Nephrops ( Nephropsnorvegicus) assessment to develop fishery independent indicators of stock size, exploitation status and catch advice. The standard methodology involves the use of a sledge mounted camera to film the seabed at a fix grid of stations conducting TV tows for 10 minutes. Data has been collected twice a year between 1997 to 2002 (Spring and Autumn) and once a year since 2003 (autumn). Dataset holds data from two areas of the North Sea (Farn Deeps-FU6 (1996 to 2012) and Botney Gut/Silver Pit-FU5 (2010 to 2012)). |
Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | The full dataset consists of approximately 160+ VHS tapes (1996 to 2002) and 260+ DVD discs (2003 to present) plus additional back-up tapes. The DVD discs are kept for reference and quality-control purposes at Cefas, Lowestoft, for a period of 5 years, after which they are disposed of. The VHS tapes are now obsolete but will be retained until January 2017 at which time they will be disposed of. Material can be made available upon request (please contact data steward for more information). Positional data and Nephrops burrow counts have been stored in a shellfish access database since 1996. In line with SGNEPS (Study Group Nephrops) recommendations all scientists are trained/re-familiarised using training material and validated using reference footage (measured by Linn’s concordance correlation coefficient (CCC)) prior to recounting each survey footage. A limit of 0.5 is used to identify counters who need further training. On completion of this process, all survey recounts are conducted, as blind counts, by two persons during the survey. Here, the number of Nephrops burrow systems and the activity in and out of the burrows are counted by each minute block (for 7 clear minutes). In cases where the field of view became obscured by cloud, the number of seconds obscured are recorded and all minute blocks with more than 20 seconds obscured are rejected for analysis. After all counts completed again the Linn’s CCC is again applied to check which stations needed to be revisited and were a 3rd or 4th counter needed to be added. Whilst reviewing the videos, the visibility, ground type, trawl marks, occurrence of bio-fauna, ground contact of the sledge, cloud and any other interference is recorded during each one-minute intervals, using a classification key. Example footage and a training presentation are available via the metadata record entitled 'Nephrops underwater TV Surveys - VHS and DVD footage'. For sediment analysis data of these grounds please contact the Cefas sedimentology team. For acoustic data recorded in these grounds (multibeam and backscattered data) please contact Cefas MIST team. |
Related keywords | ||
Keyword | General subject area(s) associated with the resource, uses multiple controlled vocabularies | Biota abundance, biomass and diversity |
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 | Crustacean | |
General subject area(s) associated with the resource, uses multiple controlled vocabularies | Shellfish | |
General subject area(s) associated with the resource, uses multiple controlled vocabularies | Stock (biological) | |
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 | Benthic boundary | |
General subject area(s) associated with the resource, uses multiple controlled vocabularies | Sediment | |
General subject area(s) associated with the resource, uses multiple controlled vocabularies | Marine Environmental Data and Information Network | |
Geographical coverage | ||
North | The northern-most limit of the data resource in decimal degrees | 55.75 |
East | The eastern-most limit of the data resource in decimal degrees | 4 |
South | The southern-most limit of the data resource in decimal degrees | 53.5 |
West | The western-most limit of the data resource in decimal degrees | -1.5 |
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 | |
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 | |
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 | |
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 | |
Role | The owner is the person or organisation that owns the resource. | owner |
Organisation name | Department for Environment, Food and Rural Affairs (DEFRA) | |
Role | The owner is the person or organisation that owns the resource. | owner |
Organisation name | European Commission | |
Resource locators | ||
Locator URL | Web address (URL) that links to the resource | https://data.cefas.co.uk/view/266 |
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/ittf/PubliclyAvailableStandards/ISO_19139_Schemas/resources/codelist/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. | 2014-06-13 |
Date of last revision | The most recent date that the resource was revised. | 2023-01-31 |
Date of creation | The date that the resource was created. | 2011-10-07 |
Harvest date | The date which this record has been (re)harvested from the provider. | 2024-04-21 |
Metadata date | The date when the content of this metadata record was last updated. | 2023-01-31 |
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 |
Metadata parent | CEFAS7c66106f-2073-437a-8470-0fc8e59fb91a |