4f4c4942-4343-5764-6473-313135383636 English NRW_DS101834 Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en 2024-05-31T09:39:37.469Z NRW 1.0 wel British National Grid (EPSG::27700) Llyn Tegid Hydroacoustic Surveys (2014) Llyn Tegid Hydroacoustic Surveys (2014) Arolwg Hydroacwstig Llyn Tegid (2014) 2015-01-31 NRW_DS115866 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 undertaken in 2014 to carry out a hydroacoustic survey and measurement of environmental variables. The purpose of this data capture was to assess the status of gwyniad and its habitat in Llyn Tegid. 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 undertaken in 2014 to carry out a hydroacoustic survey and measurement of environmental variables. The purpose of this data capture was to assess the status of gwyniad and its habitat in Llyn Tegid. 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 gwyniad (freshwater whitefish) coregonus lavaretus hydroacoustic marine and freshwater inventory sechi disc oxygen profile temperature profile NRW Thesaurus NRW Thesaurus 2023-12-31 geonetwork.thesaurus.local.theme.converted_nrw-keywords There are no access restrictions to this data. NRW may release, publish or disseminate it freely. no limitations © CNC/NRW Data may be re-used under the terms of the Open Government Licence providing it is done so, acknowledging both the source and NRW's copyright. It is the recipient's responsibility to ensure the data is fit for the intended purpose. English biota SeaVoX Vertical Co-ordinate Coverages SeaVoX Vertical Co-ordinate Coverages 2021-01-06 GWYNEDD - GWYNEDD -3.65550762 -3.58815428 52.85939622 52.90673705 2014-08-26 2014-08-26 Llyn Tegid hydroacoustic survey 2014 Documents Archive Project Number 227 Media 1519 [A] A report in .doc and .pdf format [B] Echoview Data Supplied as Comma Separated Value format files (*.csv). August 2014 [C] Oxygen profiles, temperature profiles in .xls format [D] Visual acquisition raw data (*.dt4 format) derived from the echo sounder Visual Acquisition Version 5.0.4 - proprietary software would be required to view or analyse this data. [E] Species abundance in .xls format. This will also be entered into Recorder 6 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 Carried out hydroacoustic survey and the measurement of associated environmental variables (temperature and oxygen profiles, and secchi disk reading). Utilised standardised survey and monitoring protocol for the assessment of whitefish, 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 2.0 meters per section was adopted as general target mean speed rather than an absolute upper limit. The objectives of the present project were to collect and analyse hydroacoustic survey and associated environmental data during the summer of 2014, to interpret them with respect to similar data from earlier years, and to consider their implications for the current status of the gwyniad and its habitat in Llyn Tegid. Carried out hydroacoustic survey and the measurement of associated environmental variables (temperature and oxygen profiles, and secchi disk reading). Utilised standardised survey and monitoring protocol for the assessment of whitefish, 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 2.0 meters per section was adopted as general target mean speed rather than an absolute upper limit. The objectives of the present project were to collect and analyse hydroacoustic survey and associated environmental data during the summer of 2014, to interpret them with respect to similar data from earlier years, and to consider their implications for the current status of the gwyniad and its habitat in Llyn Tegid.