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Metadata: 1997-1999 University Marine Biological Station Millport (UMBSM) Clyde Sea Nephrops Trawling Discards Survey
Abstract:
The principle project objective investigated the discards associated with the process of trawling for Nephrops norvegicus in EC waters. The present study assessed the discard composition and proportion of the total catch from Nephrops trawls in the Clyde Sea area (Scotland) and in the Central Adriatic. The fate of floating, sinking and settled (on the sea bed) discards was investigated. In the Central Adriatic study site, the focus of the study was to investigate the importance of discards to the diet of Nephrops and the food web in general. The study compares trawl samples taken from North and South Clyde Sea area sites due to the differences in hydrographic, geographic, sedimentological and biological factors.
Data holder:
University Marine Biological Station (UMBS), Millport
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Use constraints:
DASSH terms and conditions apply (https://www.dassh.ac.uk/terms-and-conditions)
Other details | ||
Internal code | Internally assigned metadata identifier | 2372 |
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. | 1997-1999 University Marine Biological Station Millport (UMBSM) Clyde Sea Nephrops Trawling Discards Survey |
Alternative title | The purpose of alternative title is to record any additional names by which the dataset may be known. | 1997-1999 University Marine Biological Station Millport (UMBSM) Study Contract Clyde Sea Nephrops Trawling Discards Survey, EC Study Contract 96/092 |
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. | 11ca8d363bb6b348f57b569b4c24910f |
Resource Identifier | This is the code assigned by the data owner. | MEDIN-114 |
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 | 1997-08-01 |
End date | This describes the date the resource ends. This may only be the year if month and day are not known | 1999-08-01 |
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. | The principle project objective investigated the discards associated with the process of trawling for Nephrops norvegicus in EC waters. The present study assessed the discard composition and proportion of the total catch from Nephrops trawls in the Clyde Sea area (Scotland) and in the Central Adriatic. The fate of floating, sinking and settled (on the sea bed) discards was investigated. In the Central Adriatic study site, the focus of the study was to investigate the importance of discards to the diet of Nephrops and the food web in general. The study compares trawl samples taken from North and South Clyde Sea area sites due to the differences in hydrographic, geographic, sedimentological and biological factors. |
Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | This study has been carried out by researchers at the University Marine Biological Station Millport (UMBSM), Istituto di Ricerche sulla Pesca Marittima and the Fisheries Research Services, Marine Laboratory Aberdeen (MLA) 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. Sample sites within the Clyde Sea area were situated in both Northern and Southern areas. This allowed comparisons between Nephrops populations and differences in two sub-areas of the Clyde Sea to be established. The Clyde Sea are was divided into Northern and Southern regions by an imaginary line devised between Troon and the tip of Holy Island. Sites in the Clyde Sea area used for SCUBA investigations of the benthic processing of discards were established in Loch Sween (ca 15m) and Loch Riddon (ca 20m). Transect lines and mapping grids were already established at the Loch Sween study site due to a previous UMBSM study conducted at the same location (EC Project No. 94/069). An area in the Fairlie Channel (North Clyde Sea) and an area in the South Clyde Sea were investigated using UWTV experiments. Both sites were used in creel experiments. Time Lapse Camera (TLC) investigations were conducted off Keppel Pier (Isle of Cumbrae). UWTV (Kongsberg Simrad OE1358) was deployed in North and South Clyde Sea sites to investigate the fate of submerged and benthic discards. Baited longlines were also used to establish the scavengers of discards. The discard composition and the proportion of Nephrops catches in the North Clyde Sea was monitored monthly onboard commercial prawn trawlers or RV Aora (UMBSM). Those of the South Clyde Sea were obtained quarterly. The composition of discard sub-samples were taxonomically analysed and size-frequency distributions were investigated. Damage assessments of Nephrops discards (commercially undersized) were performed for individuals of a carapace length of less than 25mm. The fate of Nephrops discards and bycatch was investigated by using baited (whole discarded Nephrops or 'heads') traps and creels which were deployed for 48 hours in both Clyde Sea areas. In the South Clyde Sea area, traps baited with both Nephrops and bycatch were deployed. In each experiment, 2 creel fleets (with 27 creels each in total) were used in each site. Each fleet was then divided into three blocks containing 9 creels each and they also contained three replicate creels. CCTV observations were used to analyse the fate of discards at the surface. The fate of submerged and benthic discards were observed by SCUBA divers and UWTV surveys respectively. Direct observations (SCUBA) assessed the sinking rates of discards. In the South Sea area, a longline baited at 2m depth intervals was deployed for 24 hours to assess mid water scavengers of discards. The bottom of the longline was deployed at a depth of 66m. A baited time-lapse camera (TLC) was established at Keppel Pier to record discard utilization times and the influence of different scavenger species. Night recordings were established with the help of an infra-red camera. Discards were scattered in the camera field of view (at the camera frame base) by SCUBA divers. Footage was recorded for 48 hours. A second TLC experiment was carried out for 28 hours. Baited UWTV camera experiments were carried out in both Clyde Sea areas. The UWTV camera was deployed from the RV Aora (UMBSM). The UWTV unit was composed of a Kongsberg Simrad OE1358 camera fitted with three lamps (Osprey/Bowtech) and infra-red filters (Farnell 177-143) and was mounted on a heavy frame. Bait was tied in rows across the camera frame base. UWTV deployments were performed for 1 to 4 hours in duration. Quadrat surveys involving SCUBA divers were also performed to assess the fate of discards and the interactions between scavengers. The number of scavengers observed within quadrats which surrounded bait were counted. Baited transect lines were incorporated. Two hours after the bait was deployed, feeding and approaching scavengers were observed by divers. Predator assessments were conducted by divers. |
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 | Species distribution | |
General subject area(s) associated with the resource, uses multiple controlled vocabularies | Shellfish abundance and biomass in water bodies | |
General subject area(s) associated with the resource, uses multiple controlled vocabularies | Zoobenthos taxonomic abundance | |
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 | 56.0506 |
East | The eastern-most limit of the data resource in decimal degrees | -4.856 |
South | The southern-most limit of the data resource in decimal degrees | 55.1757 |
West | The western-most limit of the data resource in decimal degrees | -5.6744 |
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 | 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 | P.G. Moore | |
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 the study 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. | 1999-11-01 |
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 |