Freshwater Gwyniad Survey Data

doi:10.15468/1dy4b5

Freshwater Gwyniad Survey Data

Citation

Natural Resources Wales (2025). Freshwater Gwyniad Survey Data. Occurrence dataset https://doi.org/10.15468/1dy4b5 accessed via GBIF.org on 2025-05-17.

Description

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.

Purpose

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.

Sampling Description

Quality Control

All Gwyniad population are estimates.

Method steps

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.

Taxonomic Coverages

Geographic Coverages

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.

Bibliographic Citations

Contacts

originator
Natural Resources Wales

metadata author
Natural Resources Wales

distributor
NBN Atlas
27 Old Gloucester St, Holborn
London
WC1N 3AX
London
GB
email: admin@nbnatlas.org

NRW NBN Administrator
administrative point of contact
position: editor
email: nbnadmin@cyfoethnaturiolcymru.gov.uk