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Metadata: Developing the selective Net Grid trawl in the NE Nephrops trawl fishery 2015/16 - Fisheries Science Partnership
Abstract:
This work was carried out as part of the Fisheries Science Partnership (FSP) programme. The trawler Luc SN 36 was chartered for 14 days between October and December 2015 to undertake trials in the Nephrops fishery off the North east coast of England. The specific objective was to modify the incline panel and the escape hole of the selective Net Grid trawl design to enable retention of marketable fish while still minimising catches of unwanted fish. The Net Grid is made of a 4-panel box section inserted into a standard two-panel trawl into which an inclined sheet of netting is laced. On top of the box section in front of netting grid is a fish escape hole. The netting grid acts as a physical barrier and guides fish out of the escape-hole while Nephrops pass through the netting to the cod end.
Data holder:
Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS)
| Other details | ||
| Internal code | Internally assigned metadata identifier | 10889 |
| 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. | Developing the selective Net Grid trawl in the NE Nephrops trawl fishery 2015/16 - Fisheries Science Partnership |
| Alternative title | The purpose of alternative title is to record any additional names by which the dataset may be known. | FSP Developing the selective Net Grid trawl in the NE Nephrops trawl 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. | CEFASd91b43a8-f8cc-415a-92eb-effdd16456e4 |
| Resource Identifier | This is the code assigned by the data owner. | CEFAS18684 |
| 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 | 2015-10-01 |
| End date | This describes the date the resource ends. This may only be the year if month and day are not known | 2015-12-31 |
| 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 trawler Luc SN 36 was chartered for 14 days between October and December 2015 to undertake trials in the Nephrops fishery off the North east coast of England. The specific objective was to modify the incline panel and the escape hole of the selective Net Grid trawl design to enable retention of marketable fish while still minimising catches of unwanted fish. The Net Grid is made of a 4-panel box section inserted into a standard two-panel trawl into which an inclined sheet of netting is laced. On top of the box section in front of netting grid is a fish escape hole. The netting grid acts as a physical barrier and guides fish out of the escape-hole while Nephrops pass through the netting to the cod end. |
| Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | Prior to this project, Cefas in collaboration with several skippers from the NE English Nephrops fishery, had shown it was possible to catch Nephrops with very low cod catches using the Net Grid trawl (the initial motivation for the design), however, this also meant large reductions in the catches of other marketable fish. Therefore, while the Net Grid was efficient at minimising fish catches while retaining Nephrops, it was considered a rather blunt tool, whereby skippers could either catch fish (including unwanted fish) and Nephrops with a conventional trawl or only Nephrops with the Net Grid trawl. The idea came from the industry to further develop the Net Grid design so that it could retain marketable fish while still avoiding unwanted catches. The modifications to the Net Grid were to the escape hole at the top of the inclined netting grid in order to retain large marketable fish, and to the length of the inclined netting grid so that there was space at the bottom of the grid under which marketable fish could pass. Two modifications were tested, a simple cover of the escape hole with T90 120mm netting and the insertion of a larger section of T90 120mm in the top of the trawl above the netting grid including the area of the escape hole. Both designs included removing 8 meshes from the bottom edge of the inclined netting grid. To test the two designs, it was necessary to observe the fish that escaped through the T90 sections and compare with the fish that were retained in the cod end of the trawl. This was done by designing a cover over the T90 escape sections which terminated in a secondary top (cover) cod end. The catches retained in the two cod ends demonstrated which fish had entered the trawl and escaped through the T90 sections compared with those which were retained in the trawl and would have been caught if the trawl was applied commercially. |
| Related keywords | ||
| Keyword | General subject area(s) associated with the resource, uses multiple controlled vocabularies | Monitoring |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Management | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Shellfish | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Advice | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Analysis | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Crustacean | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Fishing by-catch | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Shellfish abundance and biomass in water bodies | |
| 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 | Benthic boundary | |
| 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 |
| 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 | |
| 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/18684 |
| 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/iso/19139/resources/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. | 2017-08-23 |
| Date of last revision | The most recent date that the resource was revised. | 2021-12-14 |
| Date of creation | The date that the resource was created. | 2017-08-23 |
| 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. | 2021-12-14 |
| 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 |