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Metadata: Western Channel Sprat Stock Assessment 2012/13 - Fisheries Science Partnership
Abstract:
To assess the western Channel sprat population, given the importance of the fishery to the local community and its likely sustainable nature, by surveying the relevant area to provide an estimate of the stock size at the time of the fishery.
Data holder:
Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS)
| Other details | ||
| Internal code | Internally assigned metadata identifier | 9411 |
| 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. | Western Channel Sprat Stock Assessment 2012/13 - Fisheries Science Partnership |
| Alternative title | The purpose of alternative title is to record any additional names by which the dataset may be known. | FSP Western Channel Sprats Stock Assessment |
| 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. | CEFAS30edbf73-8cce-4dc1-80f4-5fc24a6bd01b |
| Resource Identifier | This is the code assigned by the data owner. | CEFAS648 |
| 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 | 2012-10-16 |
| End date | This describes the date the resource ends. This may only be the year if month and day are not known | 2012-10-28 |
| 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 assess the western Channel sprat population, given the importance of the fishery to the local community and its likely sustainable nature, by surveying the relevant area to provide an estimate of the stock size at the time of the fishery. |
| Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | In communication with a representative of the local sprat fishery, it was decided to conduct the survey at the start of the sprat fishing season, which runs between October and February. In all,12 perpendicular transects with inter-transect distance of 10 nautical miles were designed in attempt to cover the ICES rectangles where most of the annual sprat catches in the past decade(Roel et al., 2011) have been made. Discussions with the skipper of the fishing vessel chartered for the work revealed, however, that during October, the distribution of sprat and its fishery was concentrated in Lyme Bay, the central portion of the selected area. Hence, five of the original transects were dropped (1–4 and 12), leaving five transects that covered the expected core distribution (6–10), along with one transect on either side (5 and 11). One of the local sprat fishing vessels was chartered for the survey: the 11.98 m FV Mary Anne. Although the size of the fishing vessel restricted the range and vessel speed to some extent, it was imperative to the programme that the survey be conducted using a local fishing vessel experienced in fishing for the target species, i.e. sprat. Also, the aim of the project was to quantify the sprat population targeted by the inshore fishery, and we were confident that the vessel could cover the area of interest adequately. The survey took place between 14 and 20 October 2011. Acoustic surveying took place during daylight, because sprat is known to disperse into loose aggregations at night (Plirú et al., 2011), so could be more difficult to detect acoustically then. Where possible, the transects were to be completed from east to west because anecdotal information suggested that the sprat moved in from the west. Surveying the transects in the opposite direction, therefore, would have raised the possibility of sampling the same sprat on adjacent transects. Fisheries Acoustic Data Scientific quality acoustic data were collected using a portable EK60 Simrad echosounder operating at 120 kHz, connected to a Furuno GPS. Ping rate was set to 0.4 s–1 and pulse duration to 0.256 µs, to collect high-resolution data. The transducer was attached to an over-the-side mount on the port side of the vessel. The mount consisted of a vertically orientated aluminium pole that, when deployed, protruded 2 m below the surface, so that the transducer remained clear of the bubbles formed by the hull during steaming. After initial trials, a 5-inch fin was attached to the aft side of the pole to prevent vortices, caused by drag through the water, to cause the pole to vibrate during steaming. Prior to the survey (13 October), the echosounder was successfully calibrated outside Torquay harbour using a 23-mm copper sphere following standard methods (Foote et al., 1987. |
| 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 | |
| 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 | 51.5 |
| East | The eastern-most limit of the data resource in decimal degrees | -1 |
| South | The southern-most limit of the data resource in decimal degrees | 49 |
| West | The western-most limit of the data resource in decimal degrees | -6.5 |
| 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 | ||
| 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/648 |
| 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://www.nationalarchives.gov.uk/doc/open-government-licence/ | |
| 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. | 2017-01-11 |
| 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. | 2026-04-12 |
| 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 |