4f4c4942-4343-5764-6473-313135323137 English NRW_DS116344 Master Reference Data Team Natural Resources Wales, Maes y Fynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW enquiries@naturalresourceswales.gov.uk http://naturalresourceswales.gov.uk/splash?orig=/ 2024-05-31T09:39:34.224Z NRW 1.0 wel British National Grid (EPSG::27700) Llyn Tegid and Llyn Arenig Fawr hydroacoustic and Gwyniad surveys 2012 Llyn Tegid and Llyn Arenig Fawr hydroacoustic and Gwyniad surveys 2012 Gwyniad Hydroacoustic and Gill Netting Survey of Llyn Arenig Fawr 2012- CCW Science Report 1013 CCW000800000000I Gwyniad Hydroaccoustic Survey of Llyn Tegid 2012 - CCW Science Report 1012 CCW000800000000G Arolygon hydroacwstig ac arolygon o wyniaid Llyn Tegid a Llyn Arenig Fawr 2012 2012-08-07 NRW_DS115217 The gwyniad (Coregonus lavaretus) population of Llyn Tegid has been considered for a number of years to be threatened by deteriorating environmental conditions, especially those associated with eutrophication. This dataset contains the results of a project investigating the environmental variables. Attemps to translocate a population to Llyn Arenig Fawr have been attempted since 2003. The purpose of this data capture was to assess the status of gwyniad and its habitat in Llyn Tegid (native population) and Llyn Arenig Fawr (introduced population). The gwyniad (Coregonus lavaretus) population of Llyn Tegid has been considered for a number of years to be threatened by deteriorating environmental conditions, especially those associated with eutrophication. This dataset contains the results of a project investigating the environmental variables. Attemps to translocate a population to Llyn Arenig Fawr have been attempted since 2003. The purpose of this data capture was to assess the status of gwyniad and its habitat in Llyn Tegid (native population) and Llyn Arenig Fawr (introduced population). 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 Centre for Ecology and Hydrology (CEH) Environment Centre Wales, Deiniol Road, Bangor, Gwynedd, LL57 2UW, Wales enquiries@ceh.ac.uk http://www.ceh.ac.uk/ Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en sd">Species distribution Species distribution GEMET - INSPIRE themes, version 1.0 GEMET - INSPIRE themes, version 1.0 2008-06-01 geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme Llyn Tegid Llyn Arenig Fawr gwyniad (freshwater whitefish) coregonus lavaretus hydroacoustic marine and freshwater inventory secchi depth oxygen profile temperature profile NRW Thesaurus NRW Thesaurus 2023-12-31 geonetwork.thesaurus.local.theme.converted_nrw-keywords Fish taxonomy-related counts Temperature of the water column SeaDataNet Parameter Discovery Vocabulary SeaDataNet Parameter Discovery Vocabulary 2021-01-06 geonetwork.thesaurus.external.theme.rdf+xml There are no access restrictions to this data. NRW may release, publish or disseminate it freely. no limitations © 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. English biota SeaVoX Vertical Co-ordinate Coverages SeaVoX Vertical Co-ordinate Coverages 2021-01-06 water column GWYNEDD - GWYNEDD -3.66161429 -3.58302308 52.85964672 52.91223083 2012-08-06 2012-08-07 Team Leader Freshwater Ecosystems, NRW Ffynnon Reference Number: DCT-13-068971 / DCT-13-068914 Llyn Tegid Hydroacoustic Survey 2012 I. Winfield., J. Fletcher., and J. James., CCW Contract Science Report No. 1012 Ffynnon Reference Number: DCT-13-068851 / DCT-13-069046 Llyn Arenig Fawr Gwyniad Survey 2012 Winfield., J. Fletcher., and J. James., CCW Contract Science Report No. 1013 Llyn Arenig Fawr Gwyniad survey 2009 Llyn Tegid hydroacoustic survey 2012 Database [A] The final report in Microsoft Word and Adobe PDF formats (Ffynnon Word Format DCT-13-068914, PDF Format DCT-13-068971, Word Format DCT-13-068851). [B] Echoview Data from the laboratory examination and analysis of output from the echo sounder and GPS used in the field (*.csv format). [C] Oxygen and temperature profiles in .xls spreadsheet format [D] Visual acquisition raw data derived from the echo sounder (*.dt4 format). [E] Species data in .xls format [F] Images in .jpg format [G] Species data is held in Recorder 6 - Gwyniad Hydroaccoustic Survey of Llyn Tegid 2012 - CCW Science Report 1012 CCW000800000000G - Gwyniad Hydroacoustic and Gill Netting Survey of Llyn Arenig Fawr 2012- CCW Science Report 1013 CCW000800000000I 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 false At Llyn Tegid hydroacoustic surveys and the measurement of associated environmental variables (temperature and oxygen profiles, and secchi disk reading) were conducted. Utilised standardised survey and monitoring protocol for the assessment of whitefish (Bean, 2003, JNCC, 2005) with two minor deviations- rather than using the target strength to fish length relationship of Foote (1987) the relationship given by Love (1971) was used to allow wider comparison. Secondly a vessel speed of 2.0ms-1 was adopted as general target mean speed rather then an absolute upper limit. The above data collection was also undertaken at Llyn Arenig Fawr including a standardised gill-net survey. This forms part of the continuation of Llyn Tegid Hydroacoustic Surveys and Gwyniad Translocations 2004-2009 Project. At Llyn Tegid hydroacoustic surveys and the measurement of associated environmental variables (temperature and oxygen profiles, and secchi disk reading) were conducted. Utilised standardised survey and monitoring protocol for the assessment of whitefish (Bean, 2003, JNCC, 2005) with two minor deviations- rather than using the target strength to fish length relationship of Foote (1987) the relationship given by Love (1971) was used to allow wider comparison. Secondly a vessel speed of 2.0ms-1 was adopted as general target mean speed rather then an absolute upper limit. The above data collection was also undertaken at Llyn Arenig Fawr including a standardised gill-net survey. This forms part of the continuation of Llyn Tegid Hydroacoustic Surveys and Gwyniad Translocations 2004-2009 Project.