Special Area of Conservation (SAC) Monitoring: Shad Egg Survey on the River Wye (2011)
The River Wye rises on Plynlimon in the Cambrian Mountains and flows in a generally south-easterly direction to enter the Severn Estuary at Chepstow. The river is designated as a Special Area of Conservation (SAC) under the Habitats Directive for several features, including salmon, lampreys and shads. Twaite (Alosa fallax) and allis (Alosa alosa) shad. In Britain, significant populations of twaite shad are known to spawn in the Rivers Severn, Wye, Usk and Tywi. However, it is not certain whether a breeding population of allis shad still exists. The population of both species are threatened in Europe mainly due to obstructions to migration and water quality issues. The purpose of this data capture was to make an assessment of Conservation Status by summarising previous data held at the site, conducting a baseline survey and compare these with results from previous datasets. Along the length of the welsh portion of the River Wye from Builth Wells to Monmouth. The survey was conducted in May, June and July of 2011.
- Identification
- Extent
- Distribution
- Quality
- Keywords
- Spatial Reference System
- Content
- Constraints
- Maintenance
- Metadata
Identification
- Identifier
- NRW_DS114673
- Alternative Title
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- Shad Egg Survey River Wye 2011 - CCW - Report no. 11/8/4 CCW000800000000A
- Arolwg o Wyau Herlynod a Gwangod Afon Gwy
- Metadata Language
- English
- Lineage
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Environment Agency Wales (EAW) and Countryside Council for Wales, recorded egg survey data are available for six years on the River Wye, although widespread sampling data are only available for 1999, 2003 and 2004. The standard Hillman et al. (2003) methodology was amended to reduce the sampling required at sites where shad eggs were present. This enabled the JNCC (2005) target to be assessed and many more sites to be surveyed within the time available. Confidence in this dataset is high.
- Dataset Reference Date (Publication)
- 2012-01-31
Temporal Extent
- Begin date
- 2011-05-24
- End date
- 2011-07-13
- Topic category
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- Biota
Extent
Extent
- Geographic Extent
- SIR FYNWY - MONMOUTHSHIRE
- Geographic Extent
- POWYS - POWYS
))
Vertical Extent
- Medin Extent Keyword
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benthic boundary layer; water column
Distribution
- Format Type and Description
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-
Database
()
- Specification
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[A] The report is held in word and pdf format. [B] Species data is held as spreadsheets and in Recorder 6 Shad Egg Survey River Wye 2011 - CCW - Report no. 11/8/4 CCW0008000000008. [C] Images are held in JPG format.
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Database
()
Quality
Data quality
- Quality Scope
- Dataset
- Lineage
-
Environment Agency Wales (EAW) and Countryside Council for Wales, recorded egg survey data are available for six years on the River Wye, although widespread sampling data are only available for 1999, 2003 and 2004. The standard Hillman et al. (2003) methodology was amended to reduce the sampling required at sites where shad eggs were present. This enabled the JNCC (2005) target to be assessed and many more sites to be surveyed within the time available. Confidence in this dataset is high.
Keywords
Keywords
- Type
- Theme
Citation
- Date (Publication)
- 2008-06-01
Keywords
- NRW Thesaurus
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- River Wye (Afon Gwy)
- Shad
- alosa alosa
- alosa fallax
- allis shad
- Eggs
- twaite shad
- Type
- Theme
Citation
- Date (Publication)
- 2023-12-31
Keywords
- SeaDataNet Parameter Discovery Vocabulary
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- Fish abundance in water bodies
- Fish reproduction
- Type
- Theme
Citation
- Date (Revision)
- 2021-01-06
Spatial Reference System
Content
Content Information
NRW Profile
Custom Elements
Constraints
Constraints
Limitations on Public Access and Use
- Restriction type
- Other restrictions
Access Constraints Directive
- Limitations
- no limitations
Access Constraints Text
- Other constraints
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There are no access restrictions to this data. NRW may release, publish or disseminate it freely.
Use Constraints
- Use constraints type
- Other restrictions
- Other constraints
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© CNC/NRW 2011. There are no use restrictions on this data. Recipients may re-use, reproduce, disseminate this data free of charge in any format or medium, provided they do so accurately, acknowledging both the source and NRW's copyright, and do not use it in a misleading context. It is the recipient's responsibility to ensure the data is fit for the intended purpose, that dissemination or publishing does not result in duplication, and that it is fairly interpreted. Advice on interpretation should be sought where required. To avoid re-using old data, users should periodically obtain the latest version from the original source.
Metadata
Metadata
- File Identifier
- 4f4c4942-4343-5764-6473-313134363733 XML
- Metadata Language
- English
- Parent Identifier
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Freshwater Shad Monitoring Data
NRW_DS116346
- Resource type
- Dataset
- Metadata Date
- 2024-05-31T09:41:06.71Z
- Metadata Standard Name
- NRW
- Metadata Standard Version
-
1.0