4f4c4942-4343-5764-6473-313135323732 English Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en 2026-03-03T11:17:14.384Z NRW 1.0 wel British National Grid (EPSG::27700) Sensitive Marine Habitats Data Derived from Stereo Baited Remote Underwater Video System (2012) Sensitive Marine Habitats Data Derived from Stereo Baited Remote Underwater Video System (2012) Investigating sensitive marine habitats around Wales using Stereo Baited Remote Underwater Video Systems (BRUVs). Data cynefinoedd morol sensitif a gafwyd drwy ddefnyddio system fideo danddwr o bell ag atyniad stereo (2012). 2013-03-31 NRW_DS115272 This dataset was collected using Baited Remote Underwater Video Systems (BRUV). This was the first known study of its kind in temperate waters and involved extensive method development. The BRUV surveys collected information on fish assemblages over three sensitive habitats (kelp, seagrass meadows and horse mussels). Surveys took places in the coastal waters off North Wales (Llyn Peninsula) and South Wales (Pembrokeshire), within Special Areas of Conservation as designated under the EU Habitats Directive. BRUVs were used as a non-destructive and non-invasive method to assess fish communities within Wales. This project was aimed as investigating the fish species assemblages present in each habitat type and determine the age structure of these. This dataset was collected using Baited Remote Underwater Video Systems (BRUV). This was the first known study of its kind in temperate waters and involved extensive method development. The BRUV surveys collected information on fish assemblages over three sensitive habitats (kelp, seagrass meadows and horse mussels). Surveys took places in the coastal waters off North Wales (Llyn Peninsula) and South Wales (Pembrokeshire), within Special Areas of Conservation as designated under the EU Habitats Directive. BRUVs were used as a non-destructive and non-invasive method to assess fish communities within Wales. This project was aimed as investigating the fish species assemblages present in each habitat type and determine the age structure of these. 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 Welsh Government Cathays Park, Cardiff, CF10 3NQ wag-en@mailuk.custhelp.com wales.gov.uk Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Habitats and biotopes GEMET - INSPIRE themes, version 1.0 2008-06-01 geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme Video survey Special Areas of Conservation (SAC) - SAC monitoring NRW Thesaurus 2023-12-31 geonetwork.thesaurus.local.theme.converted_nrw-keywords Habitat characterisation SeaDataNet Parameter Discovery Vocabulary 2021-01-06 geonetwork.thesaurus.external.theme.rdf+xml Integrated Public Sector Vocabulary 2013-04-03 geonetwork.thesaurus.external.theme.subjects NRW SMNR Vocabulary 2023-12-27 geonetwork.thesaurus.local.theme.converted_nrw-smnr-keywords This data is jointly owned by NRW and Welsh Biodiversity Partnership, Ecosystem Resilience and Diversity, and the Welsh Government. There are no access restrictions to this data. NRW may release, publish or disseminate it freely. no limitations © CNC/ NRW and Welsh Biodiversity Partnership, Ecosystem Resilience and Diversity, and the Welsh Government, 2014 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 and Welsh Biodiversity Partnership, Ecosystem Resilience and Diversity, and the Welsh Government copyright. It is the recipient's responsibility to ensure the data is fit for the intended purpose. English biota SeaVoX Vertical Co-ordinate Coverages 2021-01-06 water column Irish Sea Tremadog Bay Cardigan Bay St. Brides Bay -5.52258379 -4.08088754 51.56385502 53.01117933 2012-09-22 2012-11-16 Documents Data supplied as part of ERD grant [A] NRW Report and Marine Pollution Bulletin Article in .pdf format [B] List of deliverable species in .xls format [C] Fish species records, held in Appendix 3 in .pdf format [D] Video retained by Swansea University 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 52 hours of footage were captured and fish assemblages were assess in three sensitive habitats; kelp (Laminaria digitata) , seagrass beds (Zostera marina, a UK BAP Priority Habitat) and horse mussels beds (Modiolus modiolus). BRUV systems were deployed for 2 and 6 hours in order to determine the optimum amount of time the BRUV needed to be deployed temperate waters. Calibrated stereo video cameras were used in order to make accurate length measurements of commercially important fish species. It took an average of 7 minutes for fish to first settle in front of the camera system and a total of 18 families including 15 different species were recorded from the three sensitive habitats. Different fish species assemblages were recorded in each of the different habitats with only poor cod (Trisopterus minutus) and dogfish (Scyliorhinadae) detected in all three habitats. The following questions were addressed with regards to the methodological approach. 1. Can BRUVs be used to investigate key ecological parameters within fish communities in temperate waters? a. Any problems of using these systems in temperate waters compared to tropical waters? b. Do amendments need to be performed to the systems to allow for sampling around the Welsh coast? c. What is the adequate amount of time a BRUV should be deployed for? 2. Do the specialised software packages produce accurate and reliable results when identifying and measuring the length of taxa in variable visibility? a. Does the shape or bend of a fish affect the length measurement? b. Which length measurement of a taxa produces the most reliable result? 3. Can we assess fish communities in three different types of sensitive habitats? a. Are there species or abundance differences between these habitats? 52 hours of footage were captured and fish assemblages were assess in three sensitive habitats; kelp (Laminaria digitata) , seagrass beds (Zostera marina, a UK BAP Priority Habitat) and horse mussels beds (Modiolus modiolus). BRUV systems were deployed for 2 and 6 hours in order to determine the optimum amount of time the BRUV needed to be deployed temperate waters. Calibrated stereo video cameras were used in order to make accurate length measurements of commercially important fish species. It took an average of 7 minutes for fish to first settle in front of the camera system and a total of 18 families including 15 different species were recorded from the three sensitive habitats. Different fish species assemblages were recorded in each of the different habitats with only poor cod (Trisopterus minutus) and dogfish (Scyliorhinadae) detected in all three habitats. The following questions were addressed with regards to the methodological approach. 1. Can BRUVs be used to investigate key ecological parameters within fish communities in temperate waters? a. Any problems of using these systems in temperate waters compared to tropical waters? b. Do amendments need to be performed to the systems to allow for sampling around the Welsh coast? c. What is the adequate amount of time a BRUV should be deployed for? 2. Do the specialised software packages produce accurate and reliable results when identifying and measuring the length of taxa in variable visibility? a. Does the shape or bend of a fish affect the length measurement? b. Which length measurement of a taxa produces the most reliable result? 3. Can we assess fish communities in three different types of sensitive habitats? a. Are there species or abundance differences between these habitats?