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Metadata: 2025 Bangor University Bycatch in Welsh Static Net Fisheries Observer Data
Abstract:
This Fisheries Industry Science Partnership project was a collaboration between Bangor University, Natural Resources Wales and the Welsh Fisherman's Association, to assess bycatch in static net fisheries in Wales from 2023 - 2025. An onboard observer program was conducted during netting operations on small scale commercial vessels and during commercial shore netting in Welsh inshore waters. Observers collected data on species catch (target and bycatch) with associated length, weight, vitality and sex data (when possible), fishing effort (duration of fishing activities), GPS locations of fishing activities, and gear characteristics (gear type, net length, mesh size). For data collection reasons only relevant available metadata is published.
Data holder:
Bangor University School of Ocean Sciences
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| Other details | ||
| Internal code | Internally assigned metadata identifier | 11422 |
| 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. | 2025 Bangor University Bycatch in Welsh Static Net Fisheries Observer Data |
| Alternative title | The purpose of alternative title is to record any additional names by which the dataset may be known. | Monitoring bycatch in Welsh static net fisheries through onboard observer data collection, 2023 - 2025 Bycatch in static nets Wales |
| 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. | 7a4ec575-229f-496a-9cc2-6a593770b1ce |
| Resource Identifier | This is the code assigned by the data owner. | BU_FISP_BSN |
| 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 | 2023-10-13 |
| End date | This describes the date the resource ends. This may only be the year if month and day are not known | 2025-01-21 |
| Spatial resolution | This describes the spatial resolution of the dataset or the spatial limitations of the service. | inapplicable |
| 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 Fisheries Industry Science Partnership project was a collaboration between Bangor University, Natural Resources Wales and the Welsh Fisherman's Association, to assess bycatch in static net fisheries in Wales from 2023 - 2025. An onboard observer program was conducted during netting operations on small scale commercial vessels and during commercial shore netting in Welsh inshore waters. Observers collected data on species catch (target and bycatch) with associated length, weight, vitality and sex data (when possible), fishing effort (duration of fishing activities), GPS locations of fishing activities, and gear characteristics (gear type, net length, mesh size). For data collection reasons only relevant available metadata is published. |
| Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | Observer data was collected as part of a FISP funded research project on bycatch in Welsh static net fisheries. Additional fisher self-reported data were used to supplement the observer data and enhance coverage. An ethical review process was performed prior to data collection and all fishers involved were MCA certified. Data were collected on 116 days from 13th October 2023 until 21st January 2025. A total of 7 commercial fishing vessels participated on a voluntary basis in both the observer programme and in providing self-reported data. Data collection was conducted in North Wales (ICES subdivision 7a) and South Wales (ICES subdivision 7g). Bycatch of all species including marine mammals, seabirds, elasmobranchs and diadromous fish were recorded across inshore areas of Wales where small commercial net fisheries operate. Count data was collected on all species captured, including target catch and bycatch. Catch data were recorded for each set, individuals were recorded at species level and biometric measurements (length and weight) were taken where possible, as well as the condition (dead or alive) and outcome (retained or discarded) recorded for each individual Species were weighed using motion compensating scales or digital scales and a sling for larger species. Individual length measurements were recorded using either a measuring board or a tape measure (depending on the size of the individual). Measurements were recorded differently for each taxonomic group: marine mammals: total length; seabirds: wingspan (left wingtip to right wingtip) and total length (bill tip to tail feather tip); elasmobranchs: total length for sharks or disc width for rays/skates; teleost: total length; crustaceans: carapace width for crabs or carapace length for lobsters. Sex of the animal was identified when possible. Metadata (site, haul and set dates and times, vessel characteristics, soak time, net characteristics etc.) were recorded for every net hauled even in the absence of target catch or bycatch to account for all effort. A Garmin handheld GPS was used to collect vessel tracks and gather coordinates when hauling for the start and end of fishing nets, with associated time data. GPS data was used to create maps of observer effort and fishing effort in QGIS. Catch data was used to calculate estimates of bycatch per unit effort (BPUE) across different taxonomic groups, species and net types. All data were manipulated and prepared for analysis in R Studio. Calculations of mean BPUE rates (and associated bootstrapped 95%CI’s), analysis of catch composition, outcome and condition proportions were all conducted in R. Generalised linear mixed models were conducted using the glmmTMB package to model BPUE rates against various predictor variables. Multivariate analysis comparing patterns in species composition across factors (net type and season) and identifying environmental variables and particular bycatch species which best explain the variation in species composition were conducted in PRIMER 7. |
| Related keywords | ||
| Keyword | 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 | NDGO0005 | |
| Keyword title | data.gov.uk | |
| Keyword | General subject area(s) associated with the resource, uses multiple controlled vocabularies | Environmental monitoring facilities |
| 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 | Fish abundance in water bodies | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Fishery characterisation | |
| 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 | Fishing effort | |
| Geographical coverage | ||
| North #1 | The northern-most limit of the data resource in decimal degrees | 51.641672200851 |
| East #1 | The eastern-most limit of the data resource in decimal degrees | -3.109130859375 |
| South #1 | The southern-most limit of the data resource in decimal degrees | 51.395564180331 |
| West #1 | The western-most limit of the data resource in decimal degrees | -3.197021484375 |
| North #2 | The northern-most limit of the data resource in decimal degrees | 53.663764258508 |
| East #2 | The eastern-most limit of the data resource in decimal degrees | -3.18603515625 |
| South #2 | The southern-most limit of the data resource in decimal degrees | 51.344338660599 |
| West #2 | The western-most limit of the data resource in decimal degrees | -5.5810546875 |
| Regional sea | Irish Sea | |
| 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 | Bangor University School of Ocean Sciences | |
| Individual name | Leo Clarke | |
| leo.clarke@liverpool.ac.uk | ||
| Role | The owner is the person or organisation that owns the resource. | owner |
| Organisation name | Bangor University School of Ocean Sciences | |
| Individual name | Leo Clarke | |
| Position name | Metadata contact | |
| leo.clarke@liverpool.ac.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 | Bangor University School of Ocean Sciences | |
| Individual name | Leo Clarke | |
| Position name | Metadata contact | |
| leo.clarke@liverpool.ac.uk | ||
| Role | The originator is the person or organisation who created, collected or produced the resource. | originator |
| Organisation name | Bangor University School of Ocean Sciences | |
| Individual name | Leo Clarke | |
| Position name | Metadata contact | |
| leo.clarke@liverpool.ac.uk | ||
| Role | The distributor is the person or organisation that distributes the resource. | distributor |
| Organisation name | Bangor University School of Ocean Sciences | |
| Individual name | Leo Clarke | |
| Position name | Metadata contact | |
| leo.clarke@liverpool.ac.uk | ||
| 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 | Restricted public access due to commercially sensitive data of catch and spatial data on fishing activities. | |
| 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 | This states any constraints on use of the data. Multiple conditions can be recorded for different parts of the data resource. If no conditions apply, then `No condtions apply` is recorded. This uses free text. | Restricted access and use. No conditions apply, the data cannot be used by the public. |
| Available data formats | ||
| Data format | Format in which digital data can be provided for transfer | Database |
| 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. | 2025-03-06 |
| Date of last revision | The most recent date that the resource was revised. | 2025-01-21 |
| 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. | 2025-03-06 |
| 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 | 3.1.2 |