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Metadata: Using light to improve cod selectivity in North Sea Nephrops trawl gears (CodSELect) - Research vessel sea trials (0723A)
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 chartered commercial fishing vessel Westro PD20. The trials took place on the Marine Directorate’s MRV Alba Na Mara between 18-30 May 2023 and were restricted to the East of Shetland, (majority of hauls between NE of Lerwick and SE of Fetlar island) due to weather conditions. 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 the trawl. Instrumentation was monitoring turbidity and light levels. No significant differences in length effects and relative catch rates were observed for any of the analysed species.
Data holder:
Scottish Government (Marine Scotland)
Use constraints:
no limitations to public access
| Other details | ||
| Internal code | Internally assigned metadata identifier | 4015 |
| 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) - Research vessel sea trials (0723A) |
| 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_12493 |
| Resource Identifier | This is the code assigned by the data owner. | Marine_Scotland_FishDAC_12493 |
| 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 | 2023-05-18 |
| End date | This describes the date the resource ends. This may only be the year if month and day are not known | 2023-05-30 |
| 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 chartered commercial fishing vessel Westro PD20. The trials took place on the Marine Directorate’s MRV Alba Na Mara between 18-30 May 2023 and were restricted to the East of Shetland, (majority of hauls between NE of Lerwick and SE of Fetlar island) due to weather conditions. 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 the trawl. Instrumentation was monitoring turbidity and light levels. No significant differences in length effects and relative catch rates were observed for any of the analysed species. |
| Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | The BT201 trawl extension was rigged with a SELTRA box incorporating a 300 mm SMP on the top panel, situated 8.7 metres from the codline. The bottom panel of the SELTRA was rigged with a 20 meter fibre optic (FO) cable illuminated by two 460nm (blue) Photosynergy SLS2500 LED light pod units, one attached on each end to produce uniform intensity output throughout the fibre length. The SLS2500 were initially powered by the 12V battery packs that are routinely used in MS RV trials and are made in house by MS. On the 5th day of the trials the battery packs were replaced by, the newly developed for the purposes of the CodSELect project, Photosynergy SBS5000 battery packs. The SBS5000 operated satisfactory and were deemed a suitable replacement to the existing MS battery packs with the additional advantage of being a fraction of the size and weight of the former. The FO cable was fitted along the length of an insert in the bottom panel of the SELTRA. Alternate hauls were conducted to form pairs with one haul being the control (light OFF) and the other the test (light ON). As fish numbers were abundant on the grounds each haul was limited to 30 minutes to minimise catch bulk. The net was towed at three knots with Scanmar units monitoring wing spread and a trawl-eye providing headline height during each haul. Hauls were conducted at depths approximately between 80 and 150 meters in typical Nephrops grounds fished by a scraper trawl. A LI-COR LI-192SA underwater quantum sensor, coupled on a LI-COR LI-1500 light sensor logger (in a custom made underwater housing by the MS engineering team), was rigged to collect real time PAR upwelling data to provide an indication of ambient light conditions, while turbidity was recorded by an RBR Solo3 logger equipped with a Seapoint turbidity sensor. The light units, battery packs, cameras and instrumentation were not wound onto the net drum as it could damage the equipment. During hauling the net was wound onto the drum up to the first attached unit, then the power block was used to bring the codend aboard using a dog rope. Large bins were used on deck to receive and store the catch from the codend. The catch was subsequently sorted into key species, weighed and individual total fish length measurements recorded. A total of 35 hauls were completed, 30 of which 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 | 61 |
| South | The southern-most limit of the data resource in decimal degrees | 59.5 |
| West | The western-most limit of the data resource in decimal degrees | -2 |
| Regional sea | 48E8 | |
| 50E9 | ||
| 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/10.7489/12493-1 |
| Locator function | Code that describes the function of the resource. ISO function code chosen from ISO 19115-1 Codelist | DOI:https://dx.doi.org/10.7489/12493-1 |
| 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 |