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Metadata: Testing Modifications to the Net Grid in the Farne Deeps Single Rig Nephrops fishery 2019/20 - Fisheries Science Partnership
Abstract:
This work was carried out as part of the Fisheries Science Partnership (FSP) programme. The aim of this project was to further develop a selective Net Grid trawl with two cod ends to improve performance and enable skippers to better match their catch compositions to their quota allocations. The information from the trials will help skippers adapt to the Landing Obligation by avoiding unwanted fish in a fishery identified as having relatively high discard rates and will demonstrate to managers the level of selectivity improvement that is currently achievable to help formulate Discard Plans. The specific objective was to modify the escape area in the Net Grid to retain selected commercial species and minimise catches of unwanted fish. This was achieved by conducting field trials of a modified Net Grid trawl with two cod ends – a lower cod end to retain primarily the Nephrops and an upper cod end to retain and select for commercial fish. At each station sampled, shot and haul, positional and times information were recorded, and for all species of fish length distribution data were taken.
Data holder:
Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS)
| Other details | ||
| Internal code | Internally assigned metadata identifier | 9353 |
| 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. | Testing Modifications to the Net Grid in the Farne Deeps Single Rig Nephrops fishery 2019/20 - Fisheries Science Partnership |
| Alternative title | The purpose of alternative title is to record any additional names by which the dataset may be known. | FSP Report 65 Testing Modifications to the Net Grid in the Farne Deeps Single Rig Nephrops fishery 2019/2020 |
| 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. | CEFAS2bc2aa29-1249-487c-a719-b730a2662996 |
| Resource Identifier | This is the code assigned by the data owner. | CEFAS20927 |
| 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 | 2019-10-01 |
| End date | This describes the date the resource ends. This may only be the year if month and day are not known | 2019-10-31 |
| 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. | This work was carried out as part of the Fisheries Science Partnership (FSP) programme. The aim of this project was to further develop a selective Net Grid trawl with two cod ends to improve performance and enable skippers to better match their catch compositions to their quota allocations. The information from the trials will help skippers adapt to the Landing Obligation by avoiding unwanted fish in a fishery identified as having relatively high discard rates and will demonstrate to managers the level of selectivity improvement that is currently achievable to help formulate Discard Plans. The specific objective was to modify the escape area in the Net Grid to retain selected commercial species and minimise catches of unwanted fish. This was achieved by conducting field trials of a modified Net Grid trawl with two cod ends – a lower cod end to retain primarily the Nephrops and an upper cod end to retain and select for commercial fish. At each station sampled, shot and haul, positional and times information were recorded, and for all species of fish length distribution data were taken. |
| Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | The trawler LUC SN36 was chartered to undertake trials in a Nephrops (Nephrops norvegicus) fishery. Twelve days of fishing trials were conducted in the Farne Deeps (ICES Rectangles: IVb; 38E8 and 39E8) fishing grounds off the North-East coast of England in October 2019. This enabled catch comparisons of three upper cod ends of varying mesh size and twine thickness to be examined in a single rig trawl with a selective Net Grid modification. Different upper cod ends were tested to select for the fish that were separated from Nephrops by the Net Grid, while the lower cod end was unchanged. A total of 28 hauls were completed, with 27 valid for analyses. Catches from the two cod ends were always kept separate. The lower cod-end was then delivered into the empty hopper and processed. The crew sorted the catch as they would normally; with the exception that all material usually discarded was retained in baskets for sampling as the “discard fraction”. Processed wanted catch and unwanted catch from each cod end were kept separate till all quantities and details had been recorded. Cefas observers sampled using standard techniques. For each haul, all fish species caught were measured to the nearest cm below. Sub sampling was necessary on occasions when the fish catch was large, but sub samples reflected the total catch composition and raising factors were calculated. |
| Related keywords | ||
| Keyword | 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 | 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 | 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 | 55.25 |
| 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 | |
| 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/20927 |
| 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. | 2020-12-03 |
| Date of last revision | The most recent date that the resource was revised. | 2021-12-16 |
| Date of creation | The date that the resource was created. | 2020-11-16 |
| Harvest date | The date which this record has been (re)harvested from the provider. | 2026-04-19 |
| Metadata date | The date when the content of this metadata record was last updated. | 2021-12-16 |
| 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 |