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Metadata: Thames ray tagging and survival 2007/08- Fisheries Science Partnership
Abstract:
To examine, primarily through traditional tagging methods, the survival rates of rays of a range of sizes released after capture by small otter trawlers, gillnetters and linefishing vessels. Timing: April - July 2007. Includes length, sex and maturity data, as well as positional and bycatch data.
Data holder:
Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS)
Other details | ||
Internal code | Internally assigned metadata identifier | 11155 |
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. | Thames ray tagging and survival 2007/08- Fisheries Science Partnership |
Alternative title | The purpose of alternative title is to record any additional names by which the dataset may be known. | FSP Thames ray tagging and survival |
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. | CEFASea57d9e9-d200-4d1a-a957-48a8002faba8 |
Resource Identifier | This is the code assigned by the data owner. | CEFAS631 |
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 | 2007-01-01 |
End date | This describes the date the resource ends. This may only be the year if month and day are not known | 2008-01-01 |
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. | To examine, primarily through traditional tagging methods, the survival rates of rays of a range of sizes released after capture by small otter trawlers, gillnetters and linefishing vessels. Timing: April - July 2007. Includes length, sex and maturity data, as well as positional and bycatch data. |
Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | This Fisheries Science Partnership project was developed to estimate the longer-term survivorship and movements of thornback ray Raja clavata in the southern North Sea, using traditional tagging methods. Thornback ray is the dominant skate species taken in targeted and mixed fisheries in this area, and is taken in various trawl, line and gillnet fisheries. Five inshore vessels were used in the study, with seven trips planned in order to examine the catches and survivorship following capture by small otter trawlers, gillnetters and longline vessels. A variety of skate and ray species is marketed as ‘skate’, and commercial landings data are for all species combined. The lack of species-specific landings data has hampered assessments of the status of individual stocks and species, although species-specific landings are required for the main skate species taken in the North Sea from 2008. Some of the larger-bodied skate species, such as common skate Dipturus batis are now of conservation concern. The main objectives of this study were to (1) examine the species, sex and size composition of skates (Rajidae) taken in inshore fisheries in the southern North Sea, (2) assess the survivorship of commercially caught fish and (3) undertake a tag-and-release programme for thornback ray. Owing to the size of the vessels involved in the fishery and the fishing locations, the utility of examining short-term survival using holding tanks was limited, although such studies have been undertaken on complementary studies in the Bristol Channel. A visual assessment of the health of fish caught under commercial conditions was made on board, with the majority of fish subsequently tagged with a Petersen disc and returned. Given that the trawlers and liners have short tow durations/soak times, most were in a good state of health, and these gear deployments were as used when fishing commercially. Studies with gillnets used 24 h soak times (as opposed to the commercial 30–48 h soak time, for which mortality would likely be very high), with drift trammelnets deployed for the standard 1–3 h. |
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 | Fish | |
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 | Water column | |
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 | 52 |
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 | 51.25 |
West | The western-most limit of the data resource in decimal degrees | 0.5 |
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 | Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS) | |
Role | The owner is the person or organisation that owns the resource. | owner |
Organisation name | Department for Environment, Food and Rural Affairs (DEFRA) | |
Resource locators | ||
Locator URL | Web address (URL) that links to the resource | https://data.cefas.co.uk/view/631 |
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. | 2015-10-22 |
Date of last revision | The most recent date that the resource was revised. | 2021-12-01 |
Date of creation | The date that the resource was created. | 2012-10-24 |
Harvest date | The date which this record has been (re)harvested from the provider. | 2024-05-05 |
Metadata date | The date when the content of this metadata record was last updated. | 2021-12-01 |
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 |