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Metadata: Testing cod end and square mesh panel configurations in the English SW otter trawl fishery 2020/21 - Fisheries Science Partnership
Abstract:
This work was carried out as part of the Fisheries Science Partnership (FSP) programme. The primary objective of the project was to obtain data on the differences between the currently permitted and proposed new trawl configurations, principally to move from the widespread use of 80mm mesh cod end to a default of 100mm. This information will help to provide evidence on the performance of more selective trawl configurations to inform on proposed changes to technical measures regulations in the southwest otter trawl mixed fishery. For this purpose, two trials lasting 6 days each took place in ICES Division 7e on the twin-rig otter trawler Rockfisher (SU6) in the months of October to December 2020. The vessel conducted simultaneous comparative tows of the control gear and two experimental gears. The first trial compared two trawls, both with 100mm cod ends, and one with an 80mm square mesh panel (SMP) and the other with 100mm SMP. A total of 19 paired hauls were collected for this trial. The second trial compared 100mm cod end with an 80mm SMP to an 80mm cod end with an 80mm SMP (as normally used by the vessel). A total of 14 paired hauls were completed for the second trial. At each station sampled, shot and haul, positional, times, depths and towing speed information were recorded, and for all species of fish length distribution data were taken, including collecting data on the benthic component of the catch.
Data holder:
Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS)
| Other details | ||
| Internal code | Internally assigned metadata identifier | 9780 |
| 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 cod end and square mesh panel configurations in the English SW otter trawl fishery 2020/21 - Fisheries Science Partnership |
| Alternative title | The purpose of alternative title is to record any additional names by which the dataset may be known. | Report_67_ SW_demersal_trawl_selectivity _2020_21 |
| 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. | CEFAS5efa0e00-6a3e-4e8f-b75d-49d7bbacbc2e |
| Resource Identifier | This is the code assigned by the data owner. | CEFAS21389 |
| 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 | 2026-04-19 |
| End date | This describes the date the resource ends. This may only be the year if month and day are not known | 2026-04-19 |
| 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 primary objective of the project was to obtain data on the differences between the currently permitted and proposed new trawl configurations, principally to move from the widespread use of 80mm mesh cod end to a default of 100mm. This information will help to provide evidence on the performance of more selective trawl configurations to inform on proposed changes to technical measures regulations in the southwest otter trawl mixed fishery. For this purpose, two trials lasting 6 days each took place in ICES Division 7e on the twin-rig otter trawler Rockfisher (SU6) in the months of October to December 2020. The vessel conducted simultaneous comparative tows of the control gear and two experimental gears. The first trial compared two trawls, both with 100mm cod ends, and one with an 80mm square mesh panel (SMP) and the other with 100mm SMP. A total of 19 paired hauls were collected for this trial. The second trial compared 100mm cod end with an 80mm SMP to an 80mm cod end with an 80mm SMP (as normally used by the vessel). A total of 14 paired hauls were completed for the second trial. At each station sampled, shot and haul, positional, times, depths and towing speed information were recorded, and for all species of fish length distribution data were taken, including collecting data on the benthic component of the catch. |
| Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | A fixed routine for handling and sorting the catch was maintained throughout the trials. Catches from the two cod ends were always kept separate and were processed as either the retained or discarded fraction. 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, and raising factors were calculated accordingly. Additionally, benthos was separated from the discarded fish, identified down to group level, and counted. The results were compiled in Excel and plotted graphically in R. |
| 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 | Fish abundance in water bodies | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Benthos | |
| 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 |
| 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 | 50 |
| West | The western-most limit of the data resource in decimal degrees | -4 |
| 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/21389 |
| 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 | https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/ | |
| 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. | 2022-01-19 |
| Date of last revision | The most recent date that the resource was revised. | 2025-11-06 |
| Date of creation | The date that the resource was created. | 2021-11-30 |
| 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. | 2025-11-06 |
| 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 |