Diver Observations on Arctic Charr (Salvelinus alpinus) Spawning Grounds in Llyn Padarn Sites of Special Scientific Interest (SSSI) - December 2010
Llyn Padarn is a large, natural lake located at the foot of Snowdon alongside the village of Llanberis, North Wales. The lake is designated as a Site of Special Scientific Interest (SSSI) for its rare, genetically distinct Arctic charr (Salvelinus alpinus) population, the presence of the nationally scarce Annex II aquatic macrophyte, Luronium natans L. (Floating Water-plantain) and the exposure of geologically important Cambrian rock sequences. The Arctic charr population is one of only three naturally occurring populations in Wales and one of the southernmost in the UK. There has been concern in relation to the declining Arctic charr population in Llyn Padarn and the potential impact of the water quality of the lake on the population. This study was undertaken to investigate potential spawning areas in the lake for Arctic charr by a SCUBA diving survey. Knowledge of the location of the spawning grounds of charr in Llyn Padarn is important to inform management of the site for conservation of the species. The purpose of this data capture was to collected information so that any additional spawning grounds (to the one location known) could be identified along with any potentially important spawning sites.
- Identification
- Extent
- Distribution
- Quality
- Keywords
- Spatial Reference System
- Content
- Constraints
- Maintenance
- Metadata
Identification
- Identifier
- NRW_DS114451
- Metadata Language
- English
- Lineage
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The scuba dive survey of the shoreline was then undertaken on the 15th of December 2010 by four divers, operating in pairs. The zodiac inflatable boat was launched from SH57376086 and the lake surveyed anti-clockwise. Generally the shore areas were investigated at 6 sites around the lake to a maximum depth of 8m. The known spawning area in Afon y Bala was also investigated. Areas considered as potential redds and the general substrate were photographed. The project objects were as follows: 1. Undertake a scuba dive survey in Llyn Padarn in December 2010. 2. Collect any charr eggs found for subsequent identification. 3. Record any potential charr spawning areas. 4. Record the substrate material at survey locations. Repeat footage was taken in 2011
- Additional Information
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Thomas, Rh. & Holt, R 2011 Diver observations on Arctic charr (Salvelinus alpinus L.) spawning grounds in Llyn Padarn SSSI. CCW Staff Science Report No. 11/8/2. 28pp.
- Dataset Reference Date (Publication)
- 2011-08-31
Extent
Extent
- Geographic Extent
- GWYNEDD - GWYNEDD
- Geographic Extent
- Wales (WLS)
))
Vertical Extent
- Medin Extent Keyword
- water column
Distribution
- Format Type and Description
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Documents
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- Specification
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[A] The final report in Microsoft Word and Adobe PDF [B] A MapInfo GIS layer on which the maps and text in the report are based plus a series of video and still images. [C] An Excel spreadsheet contains summary data
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Documents
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Quality
Data quality
- Quality Scope
- Dataset
- Conformity
- 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
- Explanation
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This dataset has not been assessed for conformance to the referenced INSPIRE regulation.
- Degree
- false
- Lineage
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The scuba dive survey of the shoreline was then undertaken on the 15th of December 2010 by four divers, operating in pairs. The zodiac inflatable boat was launched from SH57376086 and the lake surveyed anti-clockwise. Generally the shore areas were investigated at 6 sites around the lake to a maximum depth of 8m. The known spawning area in Afon y Bala was also investigated. Areas considered as potential redds and the general substrate were photographed. The project objects were as follows: 1. Undertake a scuba dive survey in Llyn Padarn in December 2010. 2. Collect any charr eggs found for subsequent identification. 3. Record any potential charr spawning areas. 4. Record the substrate material at survey locations. Repeat footage was taken in 2011
Keywords
Keywords
- Type
- Theme
Citation
- Date (Publication)
- 2008-06-01
Keywords
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NRW Thesaurus
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- Arctic charr
- salvelinus alpinus
- aquatic ecology
- Llyn Padarn
- Type
- Theme
Citation
- Date (Publication)
- 2025-01-08
Keywords
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SeaDataNet Parameter Discovery Vocabulary
- Type
- Theme
Citation
- Date (Publication)
- 2024-06-19
Spatial Reference System
Content
Content Information
NRW Profile
Custom Elements
- NRW Related Title
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Diver observations on arctic charr salvelinus alpinus L. spawning grounds in Llyn Padarn SSSI
Constraints
Constraints
Limitations on Public Access and Use
- Restriction type
- Other restrictions
Access Constraints Directive
- Limitations
- no limitations
Access Constraints Text
- Other constraints
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There are no access restrictions to this data. NRW may release, publish or disseminate it freely.
Use Constraints
- Use constraints type
- Other restrictions
- Other constraints
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© CNC/NRW 2011 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.
Metadata
Metadata
- File Identifier
- 4f4c4942-4343-5764-6473-313134343531 XML
- Metadata Language
- English
- Resource type
- Dataset
- Metadata Date
- 2026-03-03T15:26:59.121Z
- Metadata Standard Name
- NRW
- Metadata Standard Version
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1.0