Age and Growth Analysis of Native Oyster Beds (Ostrea edulis) in Wales
Dadansoddiad o oed a thwf gwelyau wystrys (Ostrea edulis) yng Nghymru

  • English
  • wel
  • All

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.

Identification

Dynodydd
Identifier
NRW_DS101725
Laith Metadata
Metadata Language
English
Lineage

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.
Dyddiad cyfeirnod y set ddata (Cyhoeddiad)
Dataset Reference Date (Publication)
2003-04-30
Perchennog
Owner
  Natural Resources Wales (NRW) -
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
Cychwynnwr
Originator
  University of Wales, Bangor. School of Ocean Sciences -
Bangor, Gwynedd, LL57 2DG
http://www.bangor.ac.uk
 

Extent

Extent

Hyd
Geographic Extent
Wales (WLS)
N
W
E
S
Map representing the geographic extent of the dataset


 

Vertical Extent

Medin Extent Keyword
benthic boundary layer
 
 

Distribution

Dosbarthiad
Distribution

Fformat - Math a Disgrifiad
Format Type and Description
  • Documents ( )

    Specification

    PDF and Word Documents.

  • Image ( )

    Specification

    Images in JPEG

 

Quality

Ansawdd Data
Data quality

Cwmpas Ansawdd
Quality Scope
Dataset
Dataset
Cydymffurfiad
Conformity
Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services
Explanation

This dataset has not been assessed for conformance to the referenced INSPIRE regulation.
Degree
false
Lineage

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.
 

Keywords

Allweddair
Keywords

GEMET - INSPIRE themes, version 1.0
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Cyhoeddiad)
Date (Publication)
2008-06-01
Code
geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme

Allweddair
Keywords

NRW Thesaurus
  • ostrea edulis
  • native oyster
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Cyhoeddiad)
Date (Publication)
2025-01-08
Code
geonetwork.thesaurus.local.theme.converted_nrw-keywords

Allweddair
Keywords

SeaDataNet Parameter Discovery Vocabulary
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Cyhoeddiad)
Date (Publication)
2024-06-19
Code
geonetwork.thesaurus.external.theme.rdf+xml
 

Spatial Reference System

Code
British National Grid (EPSG::27700)
 

Content

Gwybodaeth Cynnwys
Content Information

Proffil CNC
NRW Profile

Elfennau CNC
Custom Elements

NRW Related Title

Age and growth analysis of native oyster beds (ostrea edulis) in Wales. CONFIDENTIAL
 

Constraints

Constraints

Limitations on Public Access and Use

Math o Gyfyngiad
Restriction type
Other restrictions
Other restrictions
 

Access Constraints Directive

Limitations
no limitations
 

Access Constraints Text

Other constraints

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.
 

Use Constraints

Cyfyngiadau Defnyddio
Use constraints type
Other restrictions
Other restrictions
Other constraints

© 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.
 

Attribution Statement

Other constraints

Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved.
 

Licence

Other constraints
NRW Conditional
 
 
 

Metadata

Metadata

Dynodydd Ffeil
File Identifier
4f4c4942-4343-5764-6473-313031373235 XML
Laith Metadata
Metadata Language
English
Math o adnodd
Resource type
Dataset
Dataset
Dyddiad Metadata
Metadata Date
2026-03-03T15:45:04.468Z
Enw Safonol Metadata
Metadata Standard Name
NRW
Fersiwn Metadata
Metadata Standard Version

1.0

Pwynt Cyswllt
pointOfContact
  Natural Resources Wales (NRW) -
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
 
 

Publishing Body

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