Llyn Tegid Hydroacoustic Surveys and Gwyniad Translocation 2003
The purpose of this project was to develop a generic whitefish sampling protocol suitable for Llyn Tegid and to assess the condition of the Gwyniad population.
A population survey of Gwyniad was recommended following unsuccessful attempts to establish a refuge population in 2003. The project adapted a generic protocol for assessing whitefish (Coregonus albula and Coregonus lavaretus) populations, developed by Scottish Natural Heritage (SNH), for use with the Gwyniad population of Llyn Tegid. The survey was undertaken in July 2003 and included measurements of oxygen and temperature profiles, as well as Secchi depth readings.
The protocol involved hydroacoustic surveying and limited gill netting. This dataset contains the results of the gill netting survey only.
- Identification
- Extent
- Distribution
- Quality
- Keywords
- Spatial Reference System
- Content
- Constraints
- Maintenance
- Metadata
Identification
- Identifier
- NRW_DS115048
- Alternative Title
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- Gwyniad Gill netting survey of Llyn Tegid 2003 - CCW Science Report 597 CCW000800000000E
- Gill netting in Llyn Tegid
- Metadata Language
- English
- Lineage
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A hydroacoustic survey was conducted using a discrete parallel transect design and a BioSonics DT6000 echo sounder.
Gill netting was undertaken using both benthic and pelagic versions of the Norden survey gill net. Nets were deployed at three inshore sites, together with both a benthic and a pelagic net at offshore locations.
Oxygen and temperature profiles were recorded at a single location, and Secchi disc readings were taken at the same site.
- Additional Information
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Gwyniad translocation project: Phase One - a condition assessment of the potential donor population of Llyn Tegid CCW Contract Science Report No. 597 I. Winfield., J. Flectcher., J. James (2003)
- Dataset Reference Date (Publication)
- 2003-10-31
Temporal Extent
- Begin date
- 2002-07-02
- End date
- 2003-07-03
- Topic category
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- Biota
Extent
Extent
- Geographic Extent
- GWYNEDD - GWYNEDD
))
Distribution
Distribution
- Format Type and Description
-
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Documents
(
Unknown
)
- Specification
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Report available as PDF
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Binary
(
Unknown
)
- Specification
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Excel spreadsheet (.xlsx) containing species data
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Database
(
Unknown
)
- Specification
-
Recorder 6 dataset (Gwyniad Gill netting survey of Llyn Tegid 2003 - CCW Science Report 597 CCW000800000000E)
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Documents
(
Unknown
)
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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A hydroacoustic survey was conducted using a discrete parallel transect design and a BioSonics DT6000 echo sounder.
Gill netting was undertaken using both benthic and pelagic versions of the Norden survey gill net. Nets were deployed at three inshore sites, together with both a benthic and a pelagic net at offshore locations.
Oxygen and temperature profiles were recorded at a single location, and Secchi disc readings were taken at the same site.
Keywords
Keywords
- Type
- Theme
Citation
- Date (Publication)
- 2008-06-01
Keywords
-
NRW Thesaurus
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- gill nets
- coregonus lavaretus
- gwyniad (freshwater whitefish)
- hydroacoustic
- Llyn Tegid
- Type
- Theme
Citation
- Date (Publication)
- 2026-08-27
Spatial Reference System
Content
Content Information
NRW Profile
Custom Elements
- NRW Related Title
-
Gwyniad translocation project : Phase one : a condition assessment of the potential donor population in Llyn Tegid
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 2003 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.
Attribution Statement
- Other constraints
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Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved.
Licence
- Other constraints
- Open Government Licence
Metadata
Metadata
- File Identifier
- 4f4c4942-4343-5764-6473-313135303438 XML
- Metadata Language
- English
- Parent Identifier
-
Freshwater Gwyniad (Coregonus lavaretus) Species Survey Data
NRW_DS116344
- Resource type
- Dataset
- Metadata Date
- 2026-10-01T14:01:14.34Z
- Metadata Standard Name
- NRW
- Metadata Standard Version
-
1.0