Bullhead Monitoring for the Dee Catchment (2004)
Monitro Llyfrothennod Dalgylch Afon Dyfrdwy (2004)

  • English
  • wel
  • All

Bullhead (Cottus gobio) is listed under Annex II of the Habitats Directive as a species of Community interest. Bullhead populations have declined across Europe in recent decades as a result of human activities. Bullhead is a designated feature of the River Dee and Bala Lake / Afon Dyfrdwy a Llyn Tegid Special Area of Conservation (SAC) in Wales.


The purpose of this data capture was to assess bullhead abundance and population structure throughout the SAC. The dataset comprises population data for bullhead (Cottus gobio) collected within the River Dee catchment since 2001, together with additional quantitative and semi-quantitative survey data collected from 2004 onwards to assess bullhead abundance.

Identification

Dynodydd
Identifier
NRW_DS107797
Teitl Amgen
Alternative Title
  • Bullhead Monitoring, Dee Catchment 2001-2004- CCW - RoC Report no. 19 CCW0002800000006
  • Bullhead Monitoring - CCW - RoC Report no.19
Laith Metadata
Metadata Language
English
Lineage

Relevant bullhead abundance data were extracted from the master spreadsheet supplied with the Review of Consents (RoC) report. Where quantitative and semi-quantitative surveys were undertaken at the same site and time, only the quantitative data were extracted, as the semi-quantitative data represented a subset of the quantitative survey results.


Historical data for 2001 to 2003 were collated from the North Wales Fisheries Monitoring Programme. A limited number of sites (approximately 12) were surveyed annually to obtain information on fish populations and identify trends in abundance and catch data.


Bullhead populations were also recorded as part of the Dee Stock Assessment Programme at selected sites in 2004 and through the Eel Monitoring Programme at three sites within the Dee catchment during 2004.


All sites were surveyed using electric fishing equipment in accordance with the protocols described in the Environment Agency Electric Fishing Theory and Practice Manual (1988). Two survey methodologies were employed: quantitative temporal surveys at sites monitored annually, and semi-quantitative spatial surveys at sites monitored every five years. Three fishing runs were carried out for quantitative surveys and a single fishing run for semi-quantitative surveys.
Dyddiad cyfeirnod y set ddata (Cyhoeddiad)
Dataset Reference Date (Publication)
2004-10-31

Temporal Extent

Begin date
2001-01-01
End date
2004-10-31
 
Categori pwnc
Topic category
  • Biota
    Biota
Perchennog
Owner
  Natural Resources Wales (NRW) -
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
Cychwynnwr
Originator
  Various -
Enquiries Unit, Maes y Fynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW
http://naturalresourceswales.gov.uk/splash?orig=/
Cychwynnwr
Originator
  Environment Agency (EA) -
Millbank Tower, 25th Floor, 21//24 Millbank, London, SW1P 4XL, England
http://www.environment-agency.gov.uk/
Cychwynnwr
Originator
  Countryside Council for Wales (CCW) -
Countryside Council for Wales, Maes y Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW
http://naturalresourceswales.gov.uk/splash?orig=/
Cychwynnwr
Originator
  Natural Resources Wales (NRW) -
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
 

Extent

Extent

Hyd
Geographic Extent
POWYS - POWYS
Hyd
Geographic Extent
GWYNEDD - GWYNEDD
Hyd
Geographic Extent
SIR Y FFLINT - FLINTSHIRE
Hyd
Geographic Extent
SIR DDINBYCH - DENBIGHSHIRE
Hyd
Geographic Extent
CONWY - CONWY
Hyd
Geographic Extent
WRECSAM - WREXHAM
N
W
E
S
Map representing the geographic extent of the dataset


 
 

Distribution

Dosbarthiad
Distribution

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

    Specification

    Species data held in Recorder 6 under reference CCW0002800000006: Bullhead Monitoring, Dee Catchment, 2001-2004.

  • Documents ( Unknown )

    Specification

    Published report held in Ffynnon (DCT-10-027856).

  • Delimited ( Unknown )

    Specification

    Survey data and analysis held in Microsoft Excel spreadsheet format.

  • Geographic Information System ( Unknown )

    Specification

    Bullhead density GIS layers held in MapInfo TAB format.

  • Geographic Information System ( Unknown )

    Specification

    Bullhead density GIS layers held in ArcGIS format.

  • Database ( Unknown )

    Specification

    Archived data held under Project Number 295, Media Number 1198.

 

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

Relevant bullhead abundance data were extracted from the master spreadsheet supplied with the Review of Consents (RoC) report. Where quantitative and semi-quantitative surveys were undertaken at the same site and time, only the quantitative data were extracted, as the semi-quantitative data represented a subset of the quantitative survey results.


Historical data for 2001 to 2003 were collated from the North Wales Fisheries Monitoring Programme. A limited number of sites (approximately 12) were surveyed annually to obtain information on fish populations and identify trends in abundance and catch data.


Bullhead populations were also recorded as part of the Dee Stock Assessment Programme at selected sites in 2004 and through the Eel Monitoring Programme at three sites within the Dee catchment during 2004.


All sites were surveyed using electric fishing equipment in accordance with the protocols described in the Environment Agency Electric Fishing Theory and Practice Manual (1988). Two survey methodologies were employed: quantitative temporal surveys at sites monitored annually, and semi-quantitative spatial surveys at sites monitored every five years. Three fishing runs were carried out for quantitative surveys and a single fishing run for semi-quantitative surveys.
 

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
  • cottus gobio
  • Dee estuary
  • Special Areas of Conservation (SAC) - SAC monitoring
  • bullhead
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Cyhoeddiad)
Date (Publication)
2026-08-27
Code
geonetwork.thesaurus.local.theme.converted_nrw-keywords
 

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

River Dee candidate special area of conservation bullhead survey 2004
 

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

There are no access restrictions to this data. NRW may release, publish or disseminate it freely.
 

Use Constraints

Cyfyngiadau Defnyddio
Use constraints type
Other restrictions
Other restrictions
Other constraints

© CNC/NRW 2004 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

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

Metadata

Metadata

Dynodydd Ffeil
File Identifier
4f4c4942-4343-5764-6473-313037373937 XML
Laith Metadata
Metadata Language
English
Parent Identifier
Freshwater Bullhead Survey Data in Wales

NRW_DS107795
Math o adnodd
Resource type
Dataset
Dataset
Dyddiad Metadata
Metadata Date
2026-09-29T11:26:07.772Z
Enw Safonol Metadata
Metadata Standard Name
NRW
Fersiwn Metadata
Metadata Standard Version

1.0

Pwynt Cyswllt
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