SAC Monitoring: Shad Egg Survey River Usk and River Wye (2012)
The Rivers Usk and Wye are designated as Special Areas of Conservation (SACs) under the EC Habitats Directive (92/43/EEC) for several qualifying features, including twaite shad (Alosa fallax) and allis shad (Alosa alosa). Shad are migratory members of the Clupeidae (herring) family that ascend rivers to spawn in late spring. Populations of both species are threatened across Europe, primarily due to barriers to migration and issues relating to water quality. In the UK, significant populations of shad spawn in the Rivers Severn, Usk, Wye, and Tywi.
The Rivers Usk and Wye have been designated as SACs for shad and other qualifying features, including salmon, lamprey species, and bullhead. The purpose of this data capture was to support the assessment of favourable conservation status within the Usk and Wye catchments and to supplement the primary shad spawning distribution condition assessments for these rivers. Previous surveys were carried out on the River Usk in 2010 and 2011, and on the River Wye in 2011.
Seven sites were selected along the River Usk and 10 sites along the River Wye. Both surveys were conducted between periods of high river flow, and all fieldwork was undertaken by qualified Countryside Council for Wales (CCW) monitoring staff. Confidence in this dataset is therefore considered to be high.
- Identification
- Extent
- Distribution
- Quality
- Keywords
- Spatial Reference System
- Content
- Constraints
- Maintenance
- Metadata
Identification
- Identifier
- NRW_DS115294
- Alternative Title
-
- Metadata Language
- English
- Lineage
-
The Rivers Usk and Wye are designated as Special Areas of Conservation (SACs) under the EC Habitats Directive (92/43/EEC) for several qualifying features, including twaite shad (Alosa fallax) and allis shad (Alosa alosa). Shad are migratory members of the Clupeidae (herring) family that ascend rivers to spawn in late spring. Populations of both species are threatened across Europe, primarily due to barriers to migration and issues relating to water quality. In the UK, significant populations of shad spawn in the Rivers Severn, Usk, Wye, and Tywi.
The Rivers Usk and Wye have been designated as SACs for shad and other qualifying features, including salmon, lamprey species, and bullhead. The purpose of this data capture was to support the assessment of favourable conservation status within the Usk and Wye catchments and to supplement the primary shad spawning distribution condition assessments for these rivers. Previous surveys were carried out on the River Usk in 2010 and 2011, and on the River Wye in 2011.
Seven sites were selected along the River Usk and 10 sites along the River Wye. Both surveys were conducted between periods of high river flow, and all fieldwork was undertaken by qualified Countryside Council for Wales (CCW) monitoring staff. Confidence in this dataset is therefore considered to be high.
- Dataset Reference Date (Publication)
- 2013-06-30
Temporal Extent
- Begin date
- 2012-03-15
- End date
- 2012-05-30
- Topic category
-
- Biota
- Environment
- Inland waters
Extent
Extent
- Geographic Extent
- SIR FYNWY - MONMOUTHSHIRE
- Geographic Extent
- POWYS - POWYS
))
Distribution
Distribution
- Format Type and Description
-
-
Documents
(
Unknown
)
- Specification
-
Final report held in Microsoft Word and Adobe PDF formats.
-
Image
(
Unknown
)
- Specification
-
Survey photographs and associated images held in JPEG format.
-
Delimited
(
Unknown
)
- Specification
-
Raw survey data workbook held in Microsoft Excel format.
-
Database
(
Unknown
)
- Specification
-
Species data held in Recorder 6 under reference CCW000800000000Q.
-
Geographic Information System
(
Unknown
)
- Specification
-
GIS layers held in MapInfo TAB format.
-
Text or Plaintext
(
Unknown
)
- Specification
-
Field notes held in paper and PDF formats.
-
Documents
(
Unknown
)
Quality
Data quality
- Quality Scope
- Dataset
- 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
-
The Rivers Usk and Wye are designated as Special Areas of Conservation (SACs) under the EC Habitats Directive (92/43/EEC) for several qualifying features, including twaite shad (Alosa fallax) and allis shad (Alosa alosa). Shad are migratory members of the Clupeidae (herring) family that ascend rivers to spawn in late spring. Populations of both species are threatened across Europe, primarily due to barriers to migration and issues relating to water quality. In the UK, significant populations of shad spawn in the Rivers Severn, Usk, Wye, and Tywi.
The Rivers Usk and Wye have been designated as SACs for shad and other qualifying features, including salmon, lamprey species, and bullhead. The purpose of this data capture was to support the assessment of favourable conservation status within the Usk and Wye catchments and to supplement the primary shad spawning distribution condition assessments for these rivers. Previous surveys were carried out on the River Usk in 2010 and 2011, and on the River Wye in 2011.
Seven sites were selected along the River Usk and 10 sites along the River Wye. Both surveys were conducted between periods of high river flow, and all fieldwork was undertaken by qualified Countryside Council for Wales (CCW) monitoring staff. Confidence in this dataset is therefore considered to be high.
Keywords
Keywords
- Type
- Theme
Citation
- Date (Publication)
- 2008-06-01
Keywords
-
NRW Thesaurus
-
- alosa fallax
- Shad
- River Usk
- twaite shad
- allis shad
- Special Areas of Conservation (SAC) - SAC monitoring
- alosa alosa
- Type
- Theme
Citation
- Date (Publication)
- 2026-08-27
Spatial Reference System
Content
Content Information
NRW Profile
Custom Elements
- NRW Related Title
-
River Usk and River Wye shad egg survey 2012
- NRW Related Title
-
River Usk shad egg survey 2010
- NRW Related Title
-
River Usk shad egg survey 2011
- NRW Related Title
-
River Wye shad egg survey 2011
Constraints
Constraints
Limitations on Public Access and Use
- Restriction type
- Other restrictions
Access Constraints Directive
- Limitations
- no limitations
Access Constraints Text
- Other constraints
-
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
-
© CNC/NRW 2012. 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.
Attribution Statement
- Other constraints
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Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved.
Metadata
Metadata
- File Identifier
- 4f4c4942-4343-5764-6473-313135323934 XML
- Metadata Language
- English
- Parent Identifier
-
Condition monitoring of Special Areas of Conservation (SACs) in Wales
NRW_DS110194
- Resource type
- Dataset
- Metadata Date
- 2026-09-29T11:19:25.647Z
- Metadata Standard Name
- NRW
- Metadata Standard Version
-
1.0