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Metadata: 2023 - ongoing University of Plymouth (UoP) Isles of Scilly Trawling Impact BACI Survey
Abstract:
A new byelaw is expected to be passed which will close 43% of the Isles of Scilly district to bottom-towed fishing gear. The byelaw will allow permits to be distributed to up to six fishing vessels to use otter trawl and scallop dredge. The grounds around Scilly have not been trawled for over a decade, however there is now renewed interest to fish the water around Scilly. This creates a unique opportunity to conduct a Before-After-Control-Impact study on the impacts of bottom-towed fishing gear. At each site 3x45 minute BRUV video and 2X100m TUV transects were completed. This project will consist of a baseline against which changes to habitat complexity and biodiversity of associated communities can be quantified following resumption of trawling. This survey was also replicated at sites which will fall under the byelaw extension, which will act as reference sites.
Data holder:
Data Archive for Marine Species and Habitats
University of Plymouth
Click on the red button for resource contact details:
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| Other details | ||
| Internal code | Internally assigned metadata identifier | 11640 |
| 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. | 2023 - ongoing University of Plymouth (UoP) Isles of Scilly Trawling Impact BACI Survey |
| 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. | eacda9011880d084168cda10b679bdf5 |
| Resource Identifier | This is the code assigned by the data owner. | DASSHSE00000062 |
| 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 | 2023-05-01 |
| End date | This describes the date the resource ends. This may only be the year if month and day are not known | 2025-02-05 |
| Spatial resolution | This describes the spatial resolution of the dataset or the spatial limitations of the service. | 15 |
| Spatial resolution unit | This describes the unit of spatial resolution which for distance must be metres. | urn:ogc:def:uom:EPSG::9001 |
| 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. | A new byelaw is expected to be passed which will close 43% of the Isles of Scilly district to bottom-towed fishing gear. The byelaw will allow permits to be distributed to up to six fishing vessels to use otter trawl and scallop dredge. The grounds around Scilly have not been trawled for over a decade, however there is now renewed interest to fish the water around Scilly. This creates a unique opportunity to conduct a Before-After-Control-Impact study on the impacts of bottom-towed fishing gear. At each site 3x45 minute BRUV video and 2X100m TUV transects were completed. This project will consist of a baseline against which changes to habitat complexity and biodiversity of associated communities can be quantified following resumption of trawling. This survey was also replicated at sites which will fall under the byelaw extension, which will act as reference sites. |
| Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | Baited Remote Underwater Video (BRUV) cameras were deployed to sample reef-associated nekton species and mobile benthic fauna. Six static frames (Greenaway Marine Ltd.) each housed a Panasonic HDC-SD60 full HD video camera and a battery-operated LED light mounted onto the frame (Figure 3). In the second survey, GoPro Hero 11 minis replaced the Panasonic cameras. Two 15kg weights were attached to the housing, and a 1m pole extending out from the centre of the cameras field of view held a 13cm wide wire cage bait box (Figure 3). These were baited with 100g fresh mackerel bait, which was replenished at the start of each deployment. At each site, three cameras were deployed approximately 100m away from each other, with a surface marker buoy attached. The cameras were deployed for a total of 45 minutes to allow for settling of sediment and 30 minutes of analysable footage to be captured. Quantitative data were extracted from the BRUV footage by counting the maximum number of individuals on screen (MaxN) for each taxon that is recorded during a 30-minute period. MaxN is considered a conservative estimate of relative abundance of mobile taxon attracted to the bait, as it decreases the chance of an individual being repeatedly recorded (Cappo et al., 2003). Organisms were identified to the highest taxonomic rank possible, and the counts expressed as MaxN (± SE) per taxa, per replicate. Replicates were averaged to increase precision and avoid pseudo-replication. To quantify changes in the abundance of sessile and sedentary benthic species, Towed Underwater Video (TUV) was used comprising a HD video camera mounted onto a flying array (Figure 4). In 2023 a Surveyor-HD-J12 colour zoom titanium camera was used. The use of TUV is particularly suitable for rapidly surveying large areas and is relatively low impact (Sheehan, Stevens and Attrill, 2010; Sheehan et al., 2016). This is necessary in an impact study, to avoid confounding assessments of change over time with impacts associated with the sampling method. At each site, two ~100m video transects were recorded in 2023 and 2024. At each site, the flying array would be dropped to depth. Once a suitable height off the seabed had been achieved, recording would be commenced and would continue for a period of 10 minutes equating to approximately 100m of seabed. Following completion of one tow, the array would remain at depth and the vessel would drift for a period of 10 minutes or a distance of 100m before recommencing recording for a second replicate. Due to the requirement for a drift speed below 0.5 knots per second, the vessel would be allowed to drift in any direction from the survey point according to the wind and tide.Analysis of the video transects are conducted in two stages: Species counts were made from each entire video transect by counting individuals that passed through the â??gateâ?? formed by the two laser dots for infrequent organisms (all mobile taxa), and conspicuous sessile fauna. Taxa were recorded as density per m-2 for the species counts from video. Thirty frame grabs were extracted from each video transect (Sheehan et al., 2013; Stevens et al., 2014) and overlaid with a calibrated digital grid to quantify the encrusting, sessile species, and abundant, free-living fauna. The grid identifies the area of species to be enumerated. Analysts located the position of the grid in the HD video and use this in conjunction with the frame grab. This is to ensure that species identification is made to the highest resolution possible. A full species list is included in the appendices. Replicates were averaged to increase precision. Taxa were recorded as density (individuals per m2) for the species counts and either density or percentage cover (for ground cover and encrusting species) as appropriate for the frame grabs. For towed and baited video, all taxa present are identified and their abundance recorded. Identification was made to the highest taxonomic level deemed possible, but where appropriate and where inter-species distinctions are not possible from video analysis, some groupings were made. Data archived by DASSH but not disseminated. |
| 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 | Species distribution |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Fauna abundance per unit area of the bed | |
| Geographical coverage | ||
| North | The northern-most limit of the data resource in decimal degrees | 49.9823 |
| East | The eastern-most limit of the data resource in decimal degrees | -6.1181 |
| South | The southern-most limit of the data resource in decimal degrees | 49.8517 |
| West | The western-most limit of the data resource in decimal degrees | -6.2094 |
| Regional sea | Western Channel and Celtic Sea | |
| 28E3 | ||
| 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 | Data Archive for Marine Species and Habitats | |
| Individual name | (DASSH) | |
| Phone | 01752426237 | |
| dassh.enquiries@mba.ac.uk | ||
| Role | The owner is the person or organisation that owns the resource. | owner |
| Organisation name | University of Plymouth | |
| Individual name | Shion Reynell | |
| shion.reynell@plymouth.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 | Data Archive for Marine Species and Habitats | |
| Individual name | (DASSH) | |
| Position name | Data Manager | |
| Phone | 01752426237 | |
| dassh.enquiries@mba.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 | University of Plymouth | |
| Individual name | Shion Reynell | |
| shion.reynell@plymouth.ac.uk | ||
| Role | The originator is the person or organisation who created, collected or produced the resource. | originator |
| Organisation name | University of Plymouth | |
| Individual name | Shion Reynell | |
| shion.reynell@plymouth.ac.uk | ||
| Role | The distributor is the person or organisation that distributes the resource. | distributor |
| Organisation name | Data Archive for Marine Species and Habitats | |
| Individual name | (DASSH) | |
| Position name | Data Manager | |
| Phone | 01752426237 | |
| dassh.enquiries@mba.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 | This states any limitations on access to the data. Multiple occurences are allowed here. One entry shall be from the INSPIRE Metadata registry and the other free text should be part of the resource `Have specific limitations`. | Restricted access, please contact the metadata contact for further details |
| 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. | Not open access, please contact the metadata contact for further details |
| Available data formats | ||
| Data format | Format in which digital data can be provided for transfer | Delimited |
| 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. | 2026-03-19 |
| 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. | 2026-03-19 |
| 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 |