4f4c4942-4343-5764-6473-313135363336 English NRW_DS114501 Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en 2026-03-05T10:36:02.664Z NRW 1.0 wel Latitude and Longitude (EPSG::4326) The Feasibility of the Eradication of the Non Native Species Devil's Tongue Weed (Grateloupia turuturu) in Wales - Milford Haven Survey July 2013 The Feasibility of the Eradication of the Non Native Species Devil's Tongue Weed (Grateloupia turuturu) in Wales - Milford Haven Survey July 2013 Dichonoldeb dileu Grateloupia turuturu yng Nghymru - arolwg Aberdaugleddau Gorffennaf 2013 2013 NRW / Grateloupia turuturu records Mildord Haven survey 2013 INNS MRCCW30000000092 2014-04-30 NRW_DS115636 Grateloupia turuturu, Devil's tongue weed is a Non Native Species (NNS) now found in the UK. Devil’s tongue weed grows in sheltered areas including harbours and bays, attached to pontoons, harbour walls, shells and stones. It occurs on the lower shore in pools, and subtidally to 7 m. Due to its tolerance of low salinities it may be found in estuarine areas as well as fully marine waters. A survey was undertaken to search for and record the presence of G. turuturu within Neyland marina and the surrounding Milford Haven area. The results showed that 38% of the pontoons and other floating structures surveyed in Neyland marine and wider Milford Haven waterway had a presence of G. turuturu. It is postulated that Neyland marina provides a suitable environment for reproduction of G. turuturu and introduction may have occurred through ship ballast water and/or the import of live shellfish associated with local aquaculture. The purpose of this survey was to assess the extent of dispersion of G. turuturu in Neyland marina and the wider Milford Haven waterway with the purpose of establishing whether eradication of this species was feasible. Information on the extent, density and dispersion of G. turuturu in the Milford Haven waterway may also influence future management responses to this and other marine non-native species. Recording the extent of G. turuturu informs future management response and helps decide the feasibility of eradicating the species. Grateloupia turuturu, Devil's tongue weed is a Non Native Species (NNS) now found in the UK. Devil’s tongue weed grows in sheltered areas including harbours and bays, attached to pontoons, harbour walls, shells and stones. It occurs on the lower shore in pools, and subtidally to 7 m. Due to its tolerance of low salinities it may be found in estuarine areas as well as fully marine waters. A survey was undertaken to search for and record the presence of G. turuturu within Neyland marina and the surrounding Milford Haven area. The results showed that 38% of the pontoons and other floating structures surveyed in Neyland marine and wider Milford Haven waterway had a presence of G. turuturu. It is postulated that Neyland marina provides a suitable environment for reproduction of G. turuturu and introduction may have occurred through ship ballast water and/or the import of live shellfish associated with local aquaculture. The purpose of this survey was to assess the extent of dispersion of G. turuturu in Neyland marina and the wider Milford Haven waterway with the purpose of establishing whether eradication of this species was feasible. Information on the extent, density and dispersion of G. turuturu in the Milford Haven waterway may also influence future management responses to this and other marine non-native species. Recording the extent of G. turuturu informs future management response and helps decide the feasibility of eradicating the species. 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 Species distribution GEMET - INSPIRE themes, version 1.0 2008-06-01 geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme Grateloupia turuturu invasive species (alien species) NRW Thesaurus 2026-03-04 geonetwork.thesaurus.local.theme.converted_nrw-keywords Macroalgae and seagrass taxonomy-related counts SeaDataNet Parameter Discovery Vocabulary 2024-06-19 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, 2014. 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. Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved. Open Government Licence English biota SeaVoX Vertical Co-ordinate Coverages 2021-01-06 benthic boundary layer SIR BENFRO - PEMBROKESHIRE -5.17252267 -4.87374743 51.65751233 51.72382269 2013-07-31 2013-08-05 Jennings, C. Wray, B. 2014. Surveillance of Grateloupia turuturu in Wales – Milford Haven July 2013. NRW Evidence Report No: 17, 31pp, Natural Resources Wales, Bangor. Species data is published and available to download from the NBN Atlas as part of the NRW "Marine Non Native Species records from Natural Resources Wales (NRW) Monitoring Research and Ad-hoc Sightings"(NRW_DS116352) Surveillance of Grateloupia turuturu in Wales - Milford Haven July 2013 Documents [A] The final report in Microsoft Word and pdf format Delimited [B] Species data in Microsoft excel Geographic Information System [C] A series of GIS layers on which the maps in the report are based Image [D] A full set of images produced in jpg format 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 Pontoons and other floating structures were surveyed for the species. This involved people snorkelling around the structures and recording the presence. 22 pontoons at Neyland marina including all of the 184 finger pontoons were surveyed by teams of 2 people. Samples were also taken for further laboratory identification. Pontoons and other floating structures were surveyed for the species. This involved people snorkelling around the structures and recording the presence. 22 pontoons at Neyland marina including all of the 184 finger pontoons were surveyed by teams of 2 people. Samples were also taken for further laboratory identification.