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FSP 2006/07 Programme 20, a trawl and jigging survey of squid off the North East coast of England. The survey, on board the chartered vessel FV Nimrod, was planned to take place during the fourth quarter of 2006 to coincide with the period when squid were being caught in commercially viable quantities in the area. A first trip took place from 14 to 20 December 2006 (Part 1) but found very few squid, suggesting that squid had already moved away from the fishing grounds. The second trip took place from 11 to 17 October 2007 (Part 2). That survey was one of two surveys which aimed at developing jigging as an alternative low-impact method to catch squid with little by-catch. The second survey took place off the Western English Channel and is reported separately.
Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS)
Other details | ||
Internal code | Internally assigned metadata identifier | 9303 |
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. | North East coast squid fishery 2006/07 - Fisheries Science Partnership |
Alternative title | The purpose of alternative title is to record any additional names by which the dataset may be known. | FSP North East coast squid fishery |
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. | CEFAS17f4fb4a-1c4e-4bd9-8784-97f48a06749b |
Resource Identifier | This is the code assigned by the data owner. | CEFAS628 |
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 | 2006-10-11 |
End date | This describes the date the resource ends. This may only be the year if month and day are not known | 2006-12-20 |
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. | FSP 2006/07 Programme 20, a trawl and jigging survey of squid off the North East coast of England. The survey, on board the chartered vessel FV Nimrod, was planned to take place during the fourth quarter of 2006 to coincide with the period when squid were being caught in commercially viable quantities in the area. A first trip took place from 14 to 20 December 2006 (Part 1) but found very few squid, suggesting that squid had already moved away from the fishing grounds. The second trip took place from 11 to 17 October 2007 (Part 2). That survey was one of two surveys which aimed at developing jigging as an alternative low-impact method to catch squid with little by-catch. The second survey took place off the Western English Channel and is reported separately. |
Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | The FV Nimrod is a 15.5 m registered length fishing trawler. The vessel carried twotrawls for the survey owing to the likelihood of gear damage. Trawl 1 was a two-panelhigh lift trawl with cut away lower wings. Trawl 2 was a three-panel high lift trawlalso with cut away lower wings. Both nets were rigged on approximately 18 m of 14 inch “ Rockhopper” ground gear. Codends of 40 mm mesh, 2 mm diameter were used on both trawls for most of the survey, but a smaller mesh cod end used in a previous FSP was deployed on trawl 2 for some of the hauls. Split bridles of approximately 45 m were deployed with 9 m of “sweeps”. Warp lengths varied with water depth. Both nets had headline heights checked using the vessel’s trawl sensor system. Trawl 1 achieved 4.8 m-headline height while Trawl 2 achieved 4.3 m. The gear was spread using a pair of Bison No 8 Otter boards. It was intended that tow duration should not exceed 1h but the type of ground being surveyed and the concentrations of static gear in the areas made this sometimes impossible. Metal halide lights, 4000 W independently generated and the vessel’s four 400 W metal halide gantry mounted lights gave a total of 5600 W. It was originally intended to position the independent lighting set aft of the wheelhouse/galley, but this proved impossible. The generator/ lights were instead positioned on top of the vessel’s shelter deck on the starboard side. South African and Japanese squid jigs of various types including plastic coated, fabric covered, weighted fluorescent and bait sticks were made. Light sticks were also deployed on the lines at certain time of the survey. The jigs were first rigged as learned during a training trip to South Africa. They are deployed in a paternoster style with typically two jigs to a line fitted approximately 1 m apart on 40 lb traces with 50 lb mainline and a 20 lb “rotten bottom”. The reason for the rotten bottom was that if the rig became entangled in the seabed, theoretically only the lead weight would be lost. After consultation with a former colleague who is at present catching L. forbesi successfully off South West England it was decided to rig some of the lines in the way they do it there (1 jig on a 4 m flowing trace attached to a “French boom”). Line colour was also changed to clear “amnesia” (Trade brand name). Weight for the rigs varied according to tidal conditions from 175 g to 400 g. A variety of storage/hauling equipment was used including rods, handlines and manually operated reels known as “gurdies”. During tidal conditions, an old trawl door was used as a drogue. Grapnel style anchors were attached to a 30 m chain, which was coupled to the vessel’s main warp. The survey was designed to cover the North East coast, inshore of the Farn Deep, in ICES rectangles 39 E8 and 38 E8 (approximately between latitudes 54o 50’N and 55o 35’N, to the west of 1oW). Trawling was conducted in a way that sampled across the entire area of the fishing grounds of interest and within the agreed limits. The initial design involved a total of 7 days trawl surveying on local rough ground followed by 7 days to evaluate jigging as a fishing method. The 7-day jigging study was to be carried out separately and subsequent to the trawl survey. Standard methods employed by Cefas staff for sorting and recording catches on commercial fishing vessels were employed (see FSP reports for details). For each species retained for landing, the total volume of the catch (number of baskets) was recorded, and a length frequency was recorded for all or a sample of the fish. All species, whether retained or discarded, were measured at each haul. For the purpose of this report, the retained and discarded components were combined for the analysis. Where catches were sampled rather than fully sorted, an appropriate raising factor was determined to allow the total catch to be estimated. FV Nimrod was equipped with a catch reception hopper and sorting table allowing random selection of samples and good detection of minority species, which could be easily separated. Owing to the relatively short tow durations and sometimes large hauls of whitefish by-catch, it was, in most cases necessary to subsample parts of the retained and discarded components. Catch rates of squid were low, so the entire squid catch was sampled and frozen for analysis at a later date. Catch rates were calculated as numbers per hour towed to standardise for the effects on catch of variable tow times. |
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 | 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 | 55.75 |
East | The eastern-most limit of the data resource in decimal degrees | -0.5 |
South | The southern-most limit of the data resource in decimal degrees | 54.5 |
West | The western-most limit of the data resource in decimal degrees | -2 |
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/628 |
Locator name | Name of the web resource | Cefas Data Portal |
Dataset constraints | ||
20.1 Limitations on Public Access - Access constraints | Any restrictions imposed on accessing the resource such as the need to agree to certain licence conditions. | otherRestrictions |
20.2 Limitations on Public Access - Other constraints | https://inspire.ec.europa.eu/metadata-codelist/LimitationsOnPublicAccess/ | |
21.1 Conditions for Access and Use - Use constraints | Any restrictions imposed on accessing the resource such as the need to agree to certain licence conditions. | 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. | 2014-12-05 |
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 |
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 |
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