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Metadata: Using light to improve cod selectivity in North Sea Nephrops trawl gears (CodSELect) - Commercial vessel sea trials (1223H)
Abstract:
The reported sea trials are part of the FISP funded CodSELect project. Apart from the current trials, the project involves a number of controlled laboratory tank trials conducted in the Marine Directorate’s facilities in the Marine Laboratory in Aberdeen as well as sea trials on board the Marine Directorate’s research vessel Alba Na Mara. The trials took place on FV Westro PD20, between 3-9 October 2023, in Neprhops commercial grounds (NE Piper). The data collection was carried out by both Marine Directorate and Scottish Fishermen’s Federation scientific personnel. The objective was to investigate whether artificial light can influence fish behaviour, with main focus on cod, and enhance escape through a square mesh panel (SMP) on the top panel of a SELTRA sorting box in the extension of a commercial trawl.
Data holder:
Scottish Government (Marine Scotland)
Use constraints:
no limitations to public access
| Other details | ||
| Internal code | Internally assigned metadata identifier | 4016 |
| 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. | Using light to improve cod selectivity in North Sea Nephrops trawl gears (CodSELect) - Commercial vessel sea trials (1223H) |
| 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. | Marine_Scotland_FishDAC_12494 |
| Resource Identifier | This is the code assigned by the data owner. | Marine_Scotland_FishDAC_12494 |
| 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 | 2023-10-03 |
| End date | This describes the date the resource ends. This may only be the year if month and day are not known | 2023-10-09 |
| Spatial resolution | This describes the spatial resolution of the dataset or the spatial limitations of the service. | 200.00 |
| Spatial resolution unit | This describes the unit of spatial resolution which for distance must be metres. | http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_19139_Schemas/resources/uom/gmxUom.xml#m |
| 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'. | Not Planned |
| Abstract | The abstract provides a clear and brief statement of the content of the resource. | The reported sea trials are part of the FISP funded CodSELect project. Apart from the current trials, the project involves a number of controlled laboratory tank trials conducted in the Marine Directorate’s facilities in the Marine Laboratory in Aberdeen as well as sea trials on board the Marine Directorate’s research vessel Alba Na Mara. The trials took place on FV Westro PD20, between 3-9 October 2023, in Neprhops commercial grounds (NE Piper). The data collection was carried out by both Marine Directorate and Scottish Fishermen’s Federation scientific personnel. The objective was to investigate whether artificial light can influence fish behaviour, with main focus on cod, and enhance escape through a square mesh panel (SMP) on the top panel of a SELTRA sorting box in the extension of a commercial trawl. |
| Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | Three scientific staff joined the vessel, the Scientist In Charge (SIC) was provided by the Marine Directorate and two further observers from the Scottish Fishermen’s Federation (SFF). The vessel sailed from Peterhead towards the N.Piper grounds (ICES stat.sq. 44F0), an area selected by the vessel’s skipper for its mix of both Nephrops and whitefish. The twin trawl method was used where the vessels standard gear was towed alongside the test gear which was a vessel supplied trawl rigged with a 3 metre SELTRA sorting box. The SELTRA was rigged with a 300 mm SMP on the top panel, 9 metres from the codline, and fibre optic (FO) cables illuminated by Photosynergy’s SLS2500 white (4000K) LED light pods and powered by Photosynergy SBS5000 batteries, on the bottom panel. The decision to conduct two hour tows, instead of the commercial minimum of 4 hours, was deemed a good compromise for commercial operations that would also allow for completion of a sufficient number of hauls, within the limited trial dates, needed for the post cruise statistical analysis. Similarly, due to the limitation in trial days every effort was made to stay on the same fishing grounds to limit time lost travelling and eliminate potential area biases for the subsequent analysis. For the first half of the trip the test gear was deployed on the port side, during daylight hours, switching sides mid-trip to reduce possible side bias. Before commencing each haul a LICOR LI-192SA underwater quantum sensor coupled with a LICOR LI-250A light meter were used to obtain downwelling PAR readings as an indication of ambient light conditions. Three readings were taken, with an interval of 20 seconds between each reading, at the approximate target fishing depth (max ~100 m or if less at ~10 m from the bottom). Turbidity was recorded by an RBR Solo3 logger equipped with a Seapoint turbidity sensor. For the first haul turbidity sensors were placed inside both the control and test trawls but one of the units got damaged during the first haul and subsequent deployments measured turbidity only in the test trawl. On retrieval of the gears the first codend would be emptied into the hopper and once the catch was worked up the second would follow to avoid mixing of the catches. The catches were sorted into key species, weighed and individual total fish length measurements recorded. Fishing operations were carried out during daylight hours with 18 hauls completed, 17 of which were valid. |
| Additional information | This describes relevant references to the data e.g. reports, articles, websites plus other useful information not captured elsewhere. | There are no Bibliographic Citations |
| 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 | Fish behaviour | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Commercial fish and shellfish populations are healthy | |
| Geographical coverage | ||
| North | The northern-most limit of the data resource in decimal degrees | 58 |
| East | The eastern-most limit of the data resource in decimal degrees | 1 |
| South | The southern-most limit of the data resource in decimal degrees | 57.5 |
| Regional sea | 44F0 | |
| 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 | Scottish Government (Marine Scotland) | |
| Phone | +44 (0)300 244 4000 | |
| marinescotland@gov.scot | ||
| 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 | Scottish Government (Marine Scotland) | |
| Phone | +44 (0)300 244 4000 | |
| Delivery point | Mailpoint 11, Area 1B South, Victoria Quay | |
| Postal code | EH6 6QQ | |
| City | Edinburgh | |
| Country | United Kingdom | |
| marinescotland@gov.scot | ||
| 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 | Scottish Government (Marine Scotland) | |
| Phone | +44 (0)300 244 4000 | |
| Delivery point | Mailpoint 11, Area 1B South, Victoria Quay | |
| Postal code | EH6 6QQ | |
| City | Edinburgh | |
| Country | United Kingdom | |
| marinescotland@gov.scot | ||
| Role | The distributor is the person or organisation that distributes the resource. | distributor |
| Organisation name | Scottish Government (Marine Scotland) | |
| Phone | +44 (0)300 244 4000 | |
| Delivery point | Mailpoint 11, Area 1B South, Victoria Quay | |
| Postal code | EH6 6QQ | |
| City | Edinburgh | |
| Country | United Kingdom | |
| marinescotland@gov.scot | ||
| Role | The originator is the person or organisation who created, collected or produced the resource. | originator |
| Organisation name | Marine Scotland Science | |
| Delivery point | 375 Victoria Road | |
| Postal code | AB11 9DB | |
| City | Aberdeen | |
| Country | United Kingdom | |
| marinescotland@gov.scot | ||
| Resource locators | ||
| Locator URL | Web address (URL) that links to the resource | https://dx.doi.org/10.7489/12494-1 |
| Locator function | Code that describes the function of the resource. ISO function code chosen from ISO 19115-1 Codelist | DOI:https://dx.doi.org/10.7489/12494-1 |
| Dataset constraints | ||
| 20 Limitations on Public Access - Access constraints | otherRestrictions | |
| 20 Limitations on Public Access - Other constraints | This states any limitations on access to the data and uses free text. | no limitations to public access |
| 21 Conditions for Access and Use - Use limitation | 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. | The following attribution statement must be used: Contains information from the Scottish Government (Marine Scotland) licensed under the Open Government Licence v3.0. |
| 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. | 2024-02-07 |
| 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. | 2024-04-15 |
| Metadata standard name | The name of the metadata standard used to create this metadata | MEDIN Discovery Metadata |
| Metadata standard version | The version of the MEDIN Discovery Metadata Standard used to create the metadata record | Version 2.3.7 |