Freshwater Gwyniad Survey Data
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 species data from the results of projects established to carry out translocation, hydroacoustic surveys and measurement of environmental variables.
Data is collected in Llyn Tegid and Llyn Arenig Fawr. All hydroacoustic records are available for site centroid only. Gill netting results are recorded at the site of the cast where information was available.
The purpose of this data capture was to develop generic a generic whitefish sampling protocol suitable for Llyn Tegid and to produce a condition assessment of the population.
All Gwyniad population are estimates.
Hydroacoustic surveys were carried out to detect fish populations. Gill nettings provides information on actual fish species and allows ground-truthing and estimates of the Gwyniad population to be made.
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Looking up... the number of records that can be accessed through the NBN Atlas. This resource was last checked for updated data on 08 May 2018. The most recent data was published on 08 May 2018.Click to view records for the Freshwater Gwyniad Survey Data resource.