Freshwater Gwyniad Survey Data

Natural Resources Wales

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.

Geographic Description

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.

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.

Data quality

All Gwyniad population are estimates.

Methods

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.

Citation

Natural Resources Wales. ([Insert year of download]) Freshwater Gwyniad Survey Data. Occurrence dataset accessed through the NBNAtlas

Rights

© CNC/NRW

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 copyright. It is the recipient's responsibility to ensure the data is fit for the intended purpose.

Attribution statement: Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved.

Digitised records