4f4c4942-4343-5764-6473-313136343938 English Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en 2025-03-07T15:20:34.903Z NRW 1.0 wel British National Grid (EPSG::27700) River Dee and Bala lake Special Area of Conservation (SAC) population attribute condition assessment for brook, river and sea lamprey (2014) River Dee and Bala lake Special Area of Conservation (SAC) population attribute condition assessment for brook, river and sea lamprey (2014) Survey data: Dee lamprey larvae survey data 2014 DMS reference SAMP-753-222. 2018-03-31 NRW_DS116498 Natural Resources Wales (NRW) is responsible for monitoring the condition of lamprey populations within Special Areas of Conservation (SACs) and to ensure the maintenance of favourable conservation status within these designated sites. This is in line with Habitats Directive monitoring and reporting on a 5 yearly cycle. The River Dee and Bala lake is designated under the Habitats Directive as a Special Area of Conservation (SAC) for several feature including brook, river and sea lamprey (Lampetra planeri, L. fluviatilis and Petromyzon marinus) The populations of all three species are threatened in Europe mainly due to obstructions to migration and issues surrounding water quality. The River Dee and Bala lake SAC holds a significant population of these three lamprey species for Wales and Great Britain. The aim of this data collection was to contribute towards the assessment of the condition of the shad population in the River Dee & Bala lake SAC as part of the Habitats Directive Report Cycles. This dataset contains data from the following reporting cycles: Cycle 1: 1999 – 2005, Cycle 2: 2006 – 2012, Cycle 3: 2013 – 2018 (data collection is on-going). Natural Resources Wales (NRW) is responsible for monitoring the condition of lamprey populations within Special Areas of Conservation (SACs) and to ensure the maintenance of favourable conservation status within these designated sites. This is in line with Habitats Directive monitoring and reporting on a 5 yearly cycle. The River Dee and Bala lake is designated under the Habitats Directive as a Special Area of Conservation (SAC) for several feature including brook, river and sea lamprey (Lampetra planeri, L. fluviatilis and Petromyzon marinus) The populations of all three species are threatened in Europe mainly due to obstructions to migration and issues surrounding water quality. The River Dee and Bala lake SAC holds a significant population of these three lamprey species for Wales and Great Britain. The aim of this data collection was to contribute towards the assessment of the condition of the shad population in the River Dee & Bala lake SAC as part of the Habitats Directive Report Cycles. This dataset contains data from the following reporting cycles: Cycle 1: 1999 – 2005, Cycle 2: 2006 – 2012, Cycle 3: 2013 – 2018 (data collection is on-going). Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Protected sites Species distribution GEMET - INSPIRE themes, version 1.0 GEMET - INSPIRE themes, version 1.0 2008-06-01 geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme annual reports Special Areas of Conservation (SAC) (see also Candidate Special Areas of Conservation cSAC) sea lamprey petromyzon marinus lampetra fluviatilis Lamprey ammocoetes lampreys (river lamprey, brook lamprey and sea lamprey) Special Areas of Conservation (SAC) - SAC monitoring river lamprey lampetra planeri biological monitoring biological surveys monitoring reports brook lamprey NRW Thesaurus NRW Thesaurus 2025-01-08 geonetwork.thesaurus.local.theme.converted_nrw-keywords SeaDataNet Parameter Discovery Vocabulary SeaDataNet Parameter Discovery Vocabulary 2024-06-19 geonetwork.thesaurus.external.theme.rdf+xml IPSV Subjects List IPSV Subjects List 2020-11-18 geonetwork.thesaurus.external.theme.subjects NRW SMNR Keywords NRW SMNR Keywords 2024-06-26 geonetwork.thesaurus.local.theme.converted_nrw-smnr-keywords There are no access restrictions to this data. NRW may release, publish or disseminate it freely. no limitations © CNC/NRW 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. English biota SeaVoX Vertical Co-ordinate Coverages SeaVoX Vertical Co-ordinate Coverages 2021-01-06 Wales (WLS) England and Wales (EAW) -5.777741 -2.608865 51.240829 53.513067 1999-01-01 2018-12-31 For further information see: - Garrett, HM. 2016. River Dee and Bala lake SAC population attribute condition assessment for brook, river and sea lamprey 2014. NRW Evidence Report No 140. - Campbell, D. & Williams A.E. (2006). Lamprey survey on the River Dee & tributaries. EAW report. APEM Reference EA849. - Potter, L. (2005). Review of Dee Migratory Barriers. EAW report no. NEAT/05/10. River Dee candidate special area of conservation lamprey survey 2004 Lamprey monitoring on the River Dee special area of conservation SAC 2011 A review of the status of Salmon and Bullhead in eight Welsh SAC rivers Documents [A] Report Word & pdf format: . [B] Field record sheets: [C] GIS data: Arc GIS Shape files 10.2.2 [D] Species Data held in corporate database 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 2010-12-08 This dataset has not been assessed for conformance to the referenced INSPIRE regulation. false Between 1999 and 2013 external contractors undertook electric fishing surveys in autumn, usually once in the six year reporting cycle at 30 – 40 sample sites in the catchment. 2013 onwards: NRW has the in-house skills to undertake the electric fishing surveys and so a smaller autumnal annual sampling programme was set up. Specific details for survey methods are detailed as follows. Lamprey monitoring protocol: 1. At each site electrofishing should be undertaken over an area judged to be both optimal and sub-optimal lamprey habitat. 2. Optimal and sub-optimal habitats for ammocoetes should be sampled with 1m2 quadrats in a 100 m stretch of river at each survey site. 3. A minimum of three quadrat data points is required if possible within each survey site. The number of sampling points should be recorded on the field survey sheet. 4. All lampreys captured should be counted, measured to the nearest mm and identified as far as possible in the relevant section of the field sheet to species level in the field using the key of Gardiner (2003). The identification of lamprey ammocoetes and transformers should be as follows: a. Lampetra (river/brook lamprey) ammocoetes b .Petromyzon (sea lamprey) ammocoetes c. River lamprey transformers d. Petromyzon (sea lamprey) transformers Between 1999 and 2013 external contractors undertook electric fishing surveys in autumn, usually once in the six year reporting cycle at 30 – 40 sample sites in the catchment. 2013 onwards: NRW has the in-house skills to undertake the electric fishing surveys and so a smaller autumnal annual sampling programme was set up. Specific details for survey methods are detailed as follows. Lamprey monitoring protocol: 1. At each site electrofishing should be undertaken over an area judged to be both optimal and sub-optimal lamprey habitat. 2. Optimal and sub-optimal habitats for ammocoetes should be sampled with 1m2 quadrats in a 100 m stretch of river at each survey site. 3. A minimum of three quadrat data points is required if possible within each survey site. The number of sampling points should be recorded on the field survey sheet. 4. All lampreys captured should be counted, measured to the nearest mm and identified as far as possible in the relevant section of the field sheet to species level in the field using the key of Gardiner (2003). The identification of lamprey ammocoetes and transformers should be as follows: a. Lampetra (river/brook lamprey) ammocoetes b .Petromyzon (sea lamprey) ammocoetes c. River lamprey transformers d. Petromyzon (sea lamprey) transformers