© OpenStreetMap contributors
- Add External Layer
- Upload Shapefile
- Close
Use the checkbox () to show or hide a layer.
Use the radio buttons () to select a layer to use with the identify function.
- Layers
- Opacity
Available layers
Search for marine data across UK organisations
- How-To
- About
- Contact MEDIN
- Share
Metadata: 2000-2002 University Marine Biological Station Millport (UMBSM) Clyde Sea Technical Improvements Assessment Survey
Abstract:
An investigation was carried out to study the behaviour of three fishing fleets, two in Scotland and one in Italy, by using GPS-linked position recording units (PRUs). Eighteen fishing vessels, representative of the Nephrops (Nephrops norvegicus) trawler fishing fleet in the Clyde Sea area and Sound of Jura, were fitted with PRUs. Seventeen vessels, in the Ancona District of the Central Adriatic, which fish for clams (Chamelea gallina) by hydraulic dredge, were also fitted with position recording units. Position recording units were used to identify the spatial pattern of fishing effort and landings. By using PRUs, it is possible to gain a better understanding of fishery stocks for analytical and fishery-independent assessments. The PRU methodology also provided information on the fisheries impact on the environment. An investigation into the fishing power in the Clyde and Adriatic fisheries was also undertaken.
Data holder:
University Marine Biological Station (UMBS), Millport
Click on the red button for resource contact details:
- Click on the red button for resource contact details
Use constraints:
Dassh terms and conditions apply (https://www.dassh.ac.uk/terms-and-conditions)
Other details | ||
Internal code | Internally assigned metadata identifier | 3337 |
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. | 2000-2002 University Marine Biological Station Millport (UMBSM) Clyde Sea Technical Improvements Assessment Survey |
Alternative title | The purpose of alternative title is to record any additional names by which the dataset may be known. | 2000-2002 University Marine Biological Station Millport (UMBSM) Study Contract Clyde Sea Technical Improvements Assessment Survey, EC Study Contract 99/077 |
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. | 5152a22740e6c9dc93c870a8b1452e12 |
Resource Identifier | This is the code assigned by the data owner. | DASSH-117 |
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 | 2000-10-01 |
End date | This describes the date the resource ends. This may only be the year if month and day are not known | 2002-10-01 |
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. | An investigation was carried out to study the behaviour of three fishing fleets, two in Scotland and one in Italy, by using GPS-linked position recording units (PRUs). Eighteen fishing vessels, representative of the Nephrops (Nephrops norvegicus) trawler fishing fleet in the Clyde Sea area and Sound of Jura, were fitted with PRUs. Seventeen vessels, in the Ancona District of the Central Adriatic, which fish for clams (Chamelea gallina) by hydraulic dredge, were also fitted with position recording units. Position recording units were used to identify the spatial pattern of fishing effort and landings. By using PRUs, it is possible to gain a better understanding of fishery stocks for analytical and fishery-independent assessments. The PRU methodology also provided information on the fisheries impact on the environment. An investigation into the fishing power in the Clyde and Adriatic fisheries was also undertaken. |
Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | The project was carried out by members of the Marine Biological Station Millport (UMBSM), Fisheries Research Services, Marine Laboratory Aberdeen (MLA) and Istituto di Richerche sulla Pesca Marittima and with the financial assistance of the European Commission. The report does not necessarily reflect the views of the European Commission. The study project is in support of the Common Fisheries policy. The purpose of this study was to improve the assessment and management of important stock fisheries. Fitting commercial fishing vessels with PRUs enabled a sufficient level of data to be recorded from all three areas (Clyde Sea area, Ancona District and Fladen Ground (preliminary study)). The data collected was used to produce high resolution maps and establish the fishing effort and landings within the fisheries. The position recording unit comprised of a data-logger and a GPS satellite receiver. Positional data was collected by a Smart Antenna RS232 (CMC Electronics). The data logger was based around Triangle Digital Services TDS2020 16- bit control computer (www.TriangleData.com). Data was stored on an 8MB Compact Flash Memory card and downloaded via a PCMCIA slot in a notebook using a CF-PCA adapter or by using a serial link (with a terminal emulator programme). Data was stored in csv format. During the study, three Nephrops fisheries were investigated in Scotland (Clyde, Jura and Fladen). Comparisons could be made between sites. The Clyde Sea fishing grounds has a Nephrops stock of around 25,000 tonnes, with high exploitation rates. The Fladen Ground, off the north-east coast, holds a Nephrops stock of approximately 100,000 tonnes, however exploitation rates are low at only 6%. The Sound of Jura grounds are relatively small and account for landings of 174 tonnes. Density levels vary between sites within the Clyde Sea area as it is the most densely populated site per unit area, while the Fladen Ground holds the lowest density of Nephrops per unit area. In-house studies and published data provided information on the sediment type distribution within each study area. Nephrops population characteristics vary in correlation with the sediment category in which they burrow. Spatial factors are crucial in establishing precision stock assessments. Current stock assessment methods were developed for fin fish assessments. 60,000 tonnes of Nephrops are caught annually by the European Nephrops fishery. The Scottish Nephrops fishery accounts for one third of the European total. For Nephrops fishery management, it is important to recognise that population characteristics and heterogeneity varies in accordance to the substrate type within areas of the fishery ground. Stock assessment methods which do not account for such a variability could potentially produce erroneous results. The present study aimed to improve the assessment of stock. Population heterogeneity on varying sediment types was investigated and established by using data obtained from market and discard samples in correlation with a underwater television (UWTV) unit attached to a research vessel. RV Aora and RV Scotia deployed the UWTV unit (based on an aluminium sledge) and was towed at a speed of less than 1 knot. A Kongsberg-Simrad (OE 1362) colour camera was used by UMBSM during surveys. The camera was fitted with three underwater lights (1 x Kongsberg-Simrad (300W) and 2 x Versabeam Remote Ocean Systems (500W)). MLA used the OE 1364 series fitted with 4 Versabeam lights. The length of ground covered by UWTV trawls was measured using an odometer (confirmed by DGPS). Both cameras had a fixed focal length and viewed an area of sea bed of a known width. Trawl catch samples from the study grounds identified mean size variances of stock occupying different sediment types. Within the Ancona district, PRUs attached to dredgers fishing for clams recorded that the ground was over exploited. PRU's identified that every square meter of ground within the fisher had been dredged at least once during the year and that fleet behaviour varied seasonally. The environmental impact of the fishing fleet in the Ancona was assessed by investigating discards and bycatch. |
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 | Sea regions | |
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 and shellfish catch statistics | |
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 | |
Geographical coverage | ||
North | The northern-most limit of the data resource in decimal degrees | 55.9861 |
East | The eastern-most limit of the data resource in decimal degrees | -4.6198 |
South | The southern-most limit of the data resource in decimal degrees | 54.8671 |
West | The western-most limit of the data resource in decimal degrees | -5.9546 |
Regional sea | Irish Sea | |
benthic boundary layer | ||
infralittoral | ||
soil and sediment | ||
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 | University Marine Biological Station (UMBS), Millport | |
Individual name | Carly Cassidy | |
Postal code | KA28 0EG | |
City | Millport | |
Role | The distributor is the person or organisation that distributes the resource. | distributor |
Organisation name | Data Archive for Seabed Species and Habitats (DASSH) | |
Position name | Data Manager | |
Phone | 01752 633102 | |
Fax | 01752 633291 | |
Delivery point | Marine Biological Association of the UK, The Laboratory, Citadel Hill | |
Postal code | PL1 2PB | |
City | Plymouth | |
Role | The originator is the person or organisation who created, collected or produced the resource. | originator |
Organisation name | University Marine Biological Station (UMBS), Millport | |
Individual name | Philip Smith | |
Postal code | KA28 0EG | |
City | Millport | |
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 Marine Biological Station (UMBS), Millport | |
Individual name | Kathryn Stevenson | |
Postal code | KA28 0EG | |
City | Millport | |
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. | Dassh terms and conditions apply (https://www.dassh.ac.uk/terms-and-conditions) |
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 contents of this report may not be reproduced unless the source of the material is indicated. |
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. | 2002-12-01 |
Harvest date | The date which this record has been (re)harvested from the provider. | 2024-04-21 |
Metadata date | The date when the content of this metadata record was last updated. | 2019-11-11 |
Metadata standard name | The name of the metadata standard used to create this metadata | MEDIN Discovery metadata standard |
Metadata standard version | The version of the MEDIN Discovery Metadata Standard used to create the metadata record | 2.3.8 |