Bullhead Monitoring for the Dee Catchment, 2004
Bullhead is listed under Annex II of the Habitat and Species Directive as a "species of community interest". Bullhead numbers have been declining across Europe in recent decades as a result of human activities. Bullhead is a designated feature on 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 abundances and population structure throughout the Special Area of Conservation (SAC) area. Population data for the fish bullhead (Cottus gobio) collected in the River Dee Catchment since 2001 and additional quantitative and semi-quantitative survey data to assess bullhead abundance from 2004.
- Identification
- Extent
- Distribution
- Quality
- Keywords
- Spatial Reference System
- Content
- Constraints
- Maintenance
- Metadata
Identification
- Identifier
- NRW_DS107797
- Alternative Title
-
- Bullhead Monitoring, Dee Catchment 2001-2004- CCW - RoC Report no. 19 CCW0002800000006
- Monitro Llyfrothennod Dalgylch Afon Dyfrdwy, 2004
- Bullhead Monitoring - CCW - RoC Report no.19
- Metadata Language
- English
- Lineage
-
Relevant species abundance data was extracted from the overall spreadsheet supplied with the RoC Report. Where quantitive and semi-quantitive surveys were carried out on the same site at the same time then the semi-quantitive data has not been extracted (as this is a subset of the quantitive data). Historical data for 2001 - 2003: Data was collated from the North Wales Fisheries Monitoring Programme of 2001. A limited number of sites (approx 12) are fished on an annual basis to obtain information and detect trends within the fish populations and catches. Bullhead populations were also recorded as part of the Dee Stock Assessment Programme on a selection of sites in 2004 and as part of work on the Eel Monitoring Programme at 3 sites in the Dee Catchment for 2004. All sites were surveyed using the electric fishing equipment in accordance with protocols described in the Environment Agency - Electric Fishing Theory and Practice Manual (1988). Two methodologies were employed either quantitive temporal data for sites surveyed annually or semi-quantitive spatial data for sites surveyed every 5 years. Three fishing runs were used for quantitive surveys and one for semi-quantitive surveys.
- Additional Information
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Rivers Ecologist, NRW Further information, including information on population structure is available in CCW Review of Consents Report no. 19. This dataset has been available to download on the NBN Gateway - See Metadata Unique Resource for full details: 107795
- Dataset Reference Date (Publication)
- 2004-10-31
Temporal Extent
- Begin date
- 2001-01-01
- End date
- 2004-10-31
- Topic category
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- Biota
Extent
Extent
- Geographic Extent
- POWYS - POWYS
- Geographic Extent
- GWYNEDD - GWYNEDD
- Geographic Extent
- SIR Y FFLINT - FLINTSHIRE
- Geographic Extent
- SIR DDINBYCH - DENBIGHSHIRE
- Geographic Extent
- CONWY - CONWY
- Geographic Extent
- WRECSAM - WREXHAM
Distribution
- Format Type and Description
-
-
Database
Database
()
- Specification
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Data Archived under Project Number 295 Media Number 1198 [A] Published report held on Ffynnon DCT-10-027856 [B] Excel spreadsheets. [C] Map Info files of Bullhead Density [D] ArcGIS Files of Bullhead Density.
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Database
Database
()
Quality
Data quality
- Quality Scope
- Dataset
- Lineage
-
Relevant species abundance data was extracted from the overall spreadsheet supplied with the RoC Report. Where quantitive and semi-quantitive surveys were carried out on the same site at the same time then the semi-quantitive data has not been extracted (as this is a subset of the quantitive data). Historical data for 2001 - 2003: Data was collated from the North Wales Fisheries Monitoring Programme of 2001. A limited number of sites (approx 12) are fished on an annual basis to obtain information and detect trends within the fish populations and catches. Bullhead populations were also recorded as part of the Dee Stock Assessment Programme on a selection of sites in 2004 and as part of work on the Eel Monitoring Programme at 3 sites in the Dee Catchment for 2004. All sites were surveyed using the electric fishing equipment in accordance with protocols described in the Environment Agency - Electric Fishing Theory and Practice Manual (1988). Two methodologies were employed either quantitive temporal data for sites surveyed annually or semi-quantitive spatial data for sites surveyed every 5 years. Three fishing runs were used for quantitive surveys and one for semi-quantitive surveys.
Keywords
Keywords
- Type
- Theme
Citation
- Date (Publication)
- 2008-06-01
Keywords
- NRW Thesaurus
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- cottus gobio
- bullhead
- Special Areas of Conservation (SAC) - SAC monitoring
- Dee estuary
- Type
- Theme
Citation
- Date (Publication)
- 2023-12-31
Spatial Reference System
Content
Content Information
NRW Profile
Custom Elements
- NRW Related Title
-
River Dee candidate special area of conservation bullhead survey 2004
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
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© 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.
Metadata
Metadata
- File Identifier
- 4f4c4942-4343-5764-6473-313037373937 XML
- Metadata Language
- English
- Parent Identifier
-
Freshwater Bullhead Survey Data in Wales
NRW_DS107795
- Resource type
- Dataset
- Metadata Date
- 2024-05-31T09:37:23.489Z
- Metadata Standard Name
- NRW
- Metadata Standard Version
-
1.0