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The native flat oyster Ostrea edulis is a UK and Welsh Biodiversity Action Plan (BAP) species, for which a UK action plan exists. Native oysters have a long history of over-exploitation in Wales and elsewhere in the UK. Harvested beds in Wales used to be present off Porthcawl, Swansea Bay and Mumbles, Milford Haven, Cardigan, Pwllheli and the Menai Strait. All of these fisheries declined during the early 1900's due to intense exploitation, possibly combined with disease and poor recruitment. Significant oyster beds are now restricted to Milford Haven, Swansea Bay and Porthcawl, although at a much reduced scale. The remaining oyster populations in Wales are under threat through increased fishery effort in the existing oyster fishery and from diversification of fishing activities in the fisheries. Dredging activity used in harvesting sublittoral oysters causes physical damage to the seabed and associated marine biodiversity. Oyster beds in Milford Haven occur in the Pembrokeshire Marine Special Area of Conservation (SAC) and form part of the features for which the SAC is designated. The present work reports on the morphometric characteristics, the age structure, growth and settlement of Ostrea edulis populations from seven sites in Milford Haven in Pembrokeshire (Wales, UK). Information gained from the project will contribute to an ecological understanding of native oyster beds and provide management advice for the remaining native oyster beds in Wales.
Natural Resources Wales (NRW)
Part of this dataset is sensitive and restricted. The sensitive data is as follows; Ostrea Edulis locations and habitat locations. Sensitive data must be kept confidential; general release is not permitted due to risk of harm to the environment or third parties. Sensitive data may only be released under an appropriate NRW Licence. Requests should be referred to NRW's Access to Information Officer. Data may be released freely if the sensitive records are removed in advance, or shown only at a coarser scale.
Other details | ||
Internal code | Internally assigned metadata identifier | 1760 |
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. | Age and Growth Analysis of Native Oyster Beds (Ostrea edulis) in Wales |
Alternative title | The purpose of alternative title is to record any additional names by which the dataset may be known. | Dadansoddiad o oed a thwf gwelyau wystrys (Ostrea edulis) yng Nghymru |
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. | 4f4c4942-4343-5764-6473-313031373235 |
Resource Identifier | This is the code assigned by the data owner. | 101725 |
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 | 2002-09-01 |
End date | This describes the date the resource ends. This may only be the year if month and day are not known | 2002-09-30 |
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 native flat oyster Ostrea edulis is a UK and Welsh Biodiversity Action Plan (BAP) species, for which a UK action plan exists. Native oysters have a long history of over-exploitation in Wales and elsewhere in the UK. Harvested beds in Wales used to be present off Porthcawl, Swansea Bay and Mumbles, Milford Haven, Cardigan, Pwllheli and the Menai Strait. All of these fisheries declined during the early 1900's due to intense exploitation, possibly combined with disease and poor recruitment. Significant oyster beds are now restricted to Milford Haven, Swansea Bay and Porthcawl, although at a much reduced scale. The remaining oyster populations in Wales are under threat through increased fishery effort in the existing oyster fishery and from diversification of fishing activities in the fisheries. Dredging activity used in harvesting sublittoral oysters causes physical damage to the seabed and associated marine biodiversity. Oyster beds in Milford Haven occur in the Pembrokeshire Marine Special Area of Conservation (SAC) and form part of the features for which the SAC is designated. The present work reports on the morphometric characteristics, the age structure, growth and settlement of Ostrea edulis populations from seven sites in Milford Haven in Pembrokeshire (Wales, UK). Information gained from the project will contribute to an ecological understanding of native oyster beds and provide management advice for the remaining native oyster beds in Wales. |
Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | Samples of Ostrea edulis were collected from eight sites in Milford Haven in Pembrokeshire, South Wales (UK) during September 2002. No oysters were found during the survey in Swansea and Porthcawl, South Wales (U.K) (Thomas, 2003). The sites 1a, 1b, 2, 4 and 6 were located in the middle section of the Milford Haven waterway from a non-commercially exploited oyster area, whereas sites 7, 9 and 10 were further upstream and are from a commercially exploited oyster area. Laboratory examination of Oysters recorded shell length (L), width (W) and height (H) and dry weight of flesh calculated in order to perform morphometric analysis. |
Related keywords | ||
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 | Shellfish morphology, age and physiology | |
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 | Marine Environmental Data and Information Network | |
Geographical coverage | ||
North | The northern-most limit of the data resource in decimal degrees | 51.75529622 |
East | The eastern-most limit of the data resource in decimal degrees | -4.85378338 |
South | The southern-most limit of the data resource in decimal degrees | 51.66541605 |
West | The western-most limit of the data resource in decimal degrees | -5.00416402 |
Regional sea | Wales (WLS) | |
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 | Natural Resources Wales (NRW) | |
Phone | 0300 065 3000 | |
Delivery point | Maes-y-Ffynnon | |
Postal code | LL57 2DW | |
Role | The distributor is the person or organisation that distributes the resource. | distributor |
Organisation name | Natural Resources Wales (NRW) | |
Phone | 0300 065 3000 | |
Delivery point | Maes-y-Ffynnon | |
Postal code | LL57 2DW | |
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 | Natural Resources Wales (NRW) | |
Phone | 0300 065 3000 | |
Delivery point | Maes-y-Ffynnon | |
Postal code | LL57 2DW | |
Role | The originator is the person or organisation who created, collected or produced the resource. | originator |
Organisation name | University of Wales, Bangor. School of Ocean Sciences | |
Phone | 01248 382842 | |
Postal code | LL57 2DG | |
Dataset constraints | ||
20 Limitations on Public Access - Access constraints | ISO restriction code chosen from ISO 19115-1 Codelist | otherRestrictions |
20 Limitations on Public Access – Other constraints | Any restriction on the use of the resource such as the need to agree to certain licence conditions. | Part of this dataset is sensitive and restricted. The sensitive data is as follows; Ostrea Edulis locations and habitat locations. Sensitive data must be kept confidential; general release is not permitted due to risk of harm to the environment or third parties. Sensitive data may only be released under an appropriate NRW Licence. Requests should be referred to NRW's Access to Information Officer. Data may be released freely if the sensitive records are removed in advance, or shown only at a coarser scale. |
21 Conditions for Access and Use - Use limitation | Any restrictions imposed on accessing the resource such as the need to agree to certain licence conditions. | © CNC/NRW 2003. Recipients may only re-use sensitive data in strict confidence under the terms of an appropriate NRW Licence. No publication or dissemination is permitted, except if sensitive records are removed in advance, or shown only at a coarser scale. |
Available data formats | ||
Data format | Format in which digital data can be provided for transfer | Documents |
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. | 2003-04-30 |
Date of last revision | The most recent date that the resource was revised. | 2003-04-30 |
Metadata date | The date when the content of this metadata record was last updated. | 2021-09-15 |
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 | Version 2.3.8 |
© OpenStreetMap contributors