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Metadata: Cod Tagging in the North Thames Region 2009/10 - Fisheries Science Partnership
Abstract:
The FV Harvester was chartered between February and March 2010 as part of the FSP North Thames cod tagging programme. The aim of the programme was to investigate spatial movements of adult cod, a species known to aggregate annually between January and March (during spawning) in the North Thames and Shipwash area. In all, 233 cod were captured for tagging purposes during the study
Data holder:
Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS)
Other details | ||
Internal code | Internally assigned metadata identifier | 10474 |
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. | Cod Tagging in the North Thames Region 2009/10 - Fisheries Science Partnership |
Alternative title | The purpose of alternative title is to record any additional names by which the dataset may be known. | FSP Cod tagging north Thames region |
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. | CEFAS9ddfb55b-14ee-4219-8149-509d95f814a7 |
Resource Identifier | This is the code assigned by the data owner. | CEFAS640 |
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 | 2010-02-01 |
End date | This describes the date the resource ends. This may only be the year if month and day are not known | 2010-03-31 |
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. | The FV Harvester was chartered between February and March 2010 as part of the FSP North Thames cod tagging programme. The aim of the programme was to investigate spatial movements of adult cod, a species known to aggregate annually between January and March (during spawning) in the North Thames and Shipwash area. In all, 233 cod were captured for tagging purposes during the study |
Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | Methods Field study design The field study was designed to catch and tag ~300 mature adult cod (>50 cm long, based on maturity ogives derived from International Bottom Trawl Survey data collected between 1977 and 2005 (ICES, 2005)) with external plastic T-bar anchor tags, and ~15 DSTs. In all, 12 days at sea were split into three trips between January and March 2010 to coincide with the north Thames spawning aggregation of cod. Areas fished were based upon years of local knowledge and experience of fishermen catching cod within the north Thames region, between West Mersea and Shipwash, within 10 miles of the coast of East Anglia. The field study detailed in the DOP had to be modified during the course of fishing operations owing to disruption caused by bad weather. Planned dates and sailings had to be adjusted to coincide with limited periods of good weather, and with knowledge of a lack of sufficient numbers of cod on the inshore grounds. The extreme cold weather and unusually high run-off of snow-melt and freshwater throughout January and February 2010 meant that adult cod seemed to aggregate farther offshore (~30 miles) in deeper water, with only a limited number appearing to enter estuarine waters (based on local fisheries knowledge and catch rates during this period). Fishing vessel, gear and activity The FV Harvester is an under 10 m bottom trawler with a 115 kW engine. The trawl gear used throughout the field study was a 18 m (10 fm) Boris Box Trawl with 27 m (15 fm) sweeps, a 20 cm ( 8”) mesh size entry, 10 cm (4”) mesh in the wings, 120 mm meshes in the sleeve and codend, 30 cm (12”) hopper discs and No.4 Bison doors. Fishing activity per day was aimed to allow for approximately five variable short bottom tows, to ensure greatest survival and fitness of mature cod. The net was shot over the stern of the vessel and towed for 1–1½ h before being hauled slowly to the surface to avoid rupture of the swimbladder of any cod caught. The net was brought aboard, the codend emptied into 1000-l deck tanks of seawater, and manually sorted for mature cod. After being hauled aboard and emptied, the net was again shot, to allow continued fishing activity while any suitable cod from the previous catch were measured (for length and weight), sexed (where possible), tagged and released. Tagging procedure Between February and March 2010, 217 mature adult cod were tagged and released primarily within ICES rectangle 32 F1 of the North Thames Estuary. Cod in seemingly fit condition were placed into separate 1000-l deck tanks prior to being tagged, to assess their fitness and state of inflation of the swimbladder. All cod that were caught were in very good condition, and all were suitable for subsequent release. However, despite being hauled onto the deck slowly, most cod still showed overinflation of their swimbladder, which required deflation with a hollow needle in order for the cod to retain natural buoyancy within the deck tanks. Cod suitable for tagging (length >45 cm) were measured, weighed and placed into a „V-shaped" channel foam block which was kept wet with seawater. Then, a wet cloth was placed over the head and operculae of the fish before they were double-tagged with an external T-Bar anchor tag. In addition, 14 cod were tagged with internal DSTs. Those cod were first anaesthetized in a shallow (20 cm) bath containing 2-phenoxy-ethanol (0.5 ml l-1), before being placed on the „V-shaped" foam block with a constant flow of seawater pumped across the gills. The DST was then surgically implanted into the peritoneal cavity (details in Righton et al., 2006). A spaghetti tag attached to the DST was then placed through the lateral body wall using a curved needle. Two cod captured were unsuitable for tagging (both mature females in poor condition, due to net damage and air in body cavity), and were therefore biologically sampled on deck. For the first 100 cod, a small fin-clip was taken from the third dorsal fin and preserved in 95% ethanol in a 5 ml Eppendorf container. Finally, all cod were placed into a recovery tank before release. |
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 behaviour | |
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 | 52.25 |
East | The eastern-most limit of the data resource in decimal degrees | 3 |
South | The southern-most limit of the data resource in decimal degrees | 50.5 |
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/640 |
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. | 2016-11-14 |
Date of last revision | The most recent date that the resource was revised. | 2019-10-29 |
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. | 2024-04-21 |
Metadata date | The date when the content of this metadata record was last updated. | 2019-10-29 |
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 |