SAC Monitoring: Lamprey Monitoring for the Afon Cleddau (2012)

River lamprey (Lampetra fluviatilis), brook lamprey (Lampetra planeri), and sea lamprey (Petromyzon marinus) are listed in Annex II of the EU Habitats Directive (Council Directive 92/43/EEC on the Conservation of Natural Habitats and of Wild Fauna and Flora). Six rivers in Wales are designated as Special Areas of Conservation (SACs) for these species.

The River Cleddau, one of the westernmost river systems in Britain, can be broadly divided into its Eastern and Western arms. Assessments of species composition, distribution, abundance, and size-class structure are of particular importance in determining conservation status and condition.

The sampling strategy for the monitoring programme for sea, river, and brook lamprey followed the protocols developed for the LIFE in UK Rivers project. The survey was undertaken to assess the population attribute of the brook lamprey, river lamprey, and sea lamprey features of the River Cleddau SAC for the second Habitats Directive reporting cycle (2007-2012).

A total of 25 survey sites were sampled, comprising 12 sites in the Eastern Cleddau and 13 sites in the Western Cleddau, Pembrokeshire.

Identifier: NRW_DS115378

Alternative Title

Afonydd Cleddau Population Attribute Condition Assessment for Brook, River and Sea Lamprey 2012
Lamprey Monitoring, Cleddau Catchments 2012 - CCW - CCW Staff Science Report No. 13/8/1 CCW000800000000O

Metadata Language: English

Lineage: Lamprey population surveys and condition assessments were previously carried out by CCW in 2003 (Harvey and Cowx, 2003) and 2005 (Campbell et al., 2005).

The field survey was conducted in 2012 by Environment Agency staff using standard electrofishing methodologies. Condition assessments were undertaken using the JNCC Common Standards Monitoring Guidance for Freshwater Fauna.

Quantitative quadrat surveys were carried out in both optimal (very silty) and sub-optimal (more rocky) habitats. Electrofishing techniques were used within 1 m² quadrats to encourage lamprey to emerge from the silt, rather than stunning and trapping them within the sediment.

Quadrats in optimal habitats were sampled three times, while quadrats in sub-optimal habitats were sampled once only. The original dataset contains both positive and negative samples.

Confidence in the dataset is considered high.

Additional Information: Ffynnon Reference NRW-13-008997: Afonydd Cleddau Population Attribute Condition Assessment for Brook, River and Sea Lamprey 2012 Garrett. H., Hatton-Ellis. T., Thomas. R. CCW Staff Science Report Number 13/8/1

Dataset Reference Date (Publication): 2013-03-31

Temporal Extent

Begin date: 2012-07-10

End date: 2013-07-16

Topic category

Biota

Owner

Natural Resources Wales (NRW) -

Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales

http://naturalresources.wales/?lang=en

Originator

Environment Agency Wales (EA Wales) -

Cambria House, 29 Newport Road, Cardiff, CF24 0TP, Wales

www.environment-agency.gov.uk

Extent

Geographic Extent: SIR BENFRO - PEMBROKESHIRE

Distribution

Format Type and Description

Binary ( Unknown )

Specification

Excel spreadsheets containing raw data and analysis (.xls)
Database ( Unknown )

Specification

Recorder 6 species dataset (Lamprey Monitoring, Cleddau Catchments 2012 - CCW - CCW Staff Science Report No. 13/8/1 CCW000800000000O)
Documents ( Unknown )

Specification

Final report in Microsoft Word and Adobe PDF formats; Field notes in paper format
Geographic Information System ( Unknown )

Specification

GIS layers used to create report maps
Image ( Unknown )

Specification

Report images in JPEG format

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: Lamprey population surveys and condition assessments were previously carried out by CCW in 2003 (Harvey and Cowx, 2003) and 2005 (Campbell et al., 2005).

The field survey was conducted in 2012 by Environment Agency staff using standard electrofishing methodologies. Condition assessments were undertaken using the JNCC Common Standards Monitoring Guidance for Freshwater Fauna.

Quantitative quadrat surveys were carried out in both optimal (very silty) and sub-optimal (more rocky) habitats. Electrofishing techniques were used within 1 m² quadrats to encourage lamprey to emerge from the silt, rather than stunning and trapping them within the sediment.

Quadrats in optimal habitats were sampled three times, while quadrats in sub-optimal habitats were sampled once only. The original dataset contains both positive and negative samples.

Confidence in the dataset is considered high.

Keywords

GEMET - INSPIRE themes, version 1.0

Species distribution

Type: Theme

Citation

Date (Publication): 2008-06-01

Code: geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme

Keywords

NRW Thesaurus

Eastern Cleddau River
Afonydd Cleddau
Western Cleddau river
Special Areas of Conservation (SAC) - SAC monitoring
lampreys (river lamprey, brook lamprey and sea lamprey)

Type: Theme

Citation

Date (Publication): 2026-08-27

Code: geonetwork.thesaurus.local.theme.converted_nrw-keywords

Code: British National Grid (EPSG::27700)

Content Information

NRW Profile

Custom Elements

NRW Related Title: Afonydd Cleddau population attribute condition assessment for brook, river and sea lamprey 2012

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

Licence

Other constraints: Open Government Licence

Metadata

File Identifier: 4f4c4942-4343-5764-6473-313135333738 XML

Metadata Language: English

Parent Identifier: Freshwater River lamprey (Lampetra fluviatilis), Brook lamprey (Lampetra planeri) and Sea lamprey (Petromyzon marinus) Survey Data
NRW_DS116345

Resource type: Dataset

Metadata Date: 2026-10-01T14:13:19.396Z

Metadata Standard Name: NRW

Metadata Standard Version: 1.0

pointOfContact

Master Reference Data Team -

Natural Resources Wales, Maes y Fynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW

http://naturalresourceswales.gov.uk/splash?orig=/

Publishing Body

Access the portal

Full access to the portal and metadata.

SAC Monitoring: Lamprey Monitoring for the Afon Cleddau (2012)

Identification

Temporal Extent

Extent

Extent

Distribution

Distribution

Quality

Data quality

Keywords

Keywords

Citation

Keywords

Citation

Spatial Reference System

Content

Content Information

NRW Profile

Custom Elements

Constraints

Constraints

Limitations on Public Access and Use

Access Constraints Directive

Access Constraints Text

Use Constraints

Attribution Statement

Licence

Metadata

Metadata

Publishing Body