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Fishing Days to Monitor Populations


Grayling fishing days are one of the best ways to monitor populations; by allowing anglers to fish for grayling for a specific number of hours on a specific day. All grayling captured are recorded along with their weight, sex, length and a sample of scales can be taken for analysis (GRT can help with ageing scales). From this,  information on growth rates, sex ratios and condition of populations can be calculated. Because the number of hours fished is standardised or recorded, results from different events can be compared. Grayling fishing days are run by a number of clubs and organisations, a selection are listed below along with details and summary reports.


Examples

Annan River Trust

River Tweed

 

Please contact us if you run a similar scheme so we can promote your work.


 

 

GS Symposium Speakers

GRT Funded MSc, PhD Studies

Two degree project interim reports were among presentations at the most recent Grayling Society symposium. Both studies are currently funded by the GRT and both operate on a premise that alongside the intrinsic value of grayling as a game fish, their survival challenges provide early indication of problems that are or will likely become problems for other salmonids.

 

Stephen Gregory (Game and Wildlife Conservation Trust) described an MSc study plan for statistical mining of the existing Wylye Study data, questioning the effect of extreme climate events on grayling population dynamics. He emphasized that the GWCT now leads all processing aspects of the 30-year Wylye Grayling Study (WGS) dataset - the longest and most complete in Europe...possibly in the world.

 

Vanessa Huml's (Manchester Metropolitan University) PhD study is titled Assessing adaptive genetic variation for effective management and conservation of European grayling. Read her description of planned work, noting reference to new sequencing technology and reference to the four U.K. genetically distinct groups identified in the earlier genetic census funded by the GRT.

 

The two studies both look at grayling population health/stability under extant environmental conditions but the doctoral work extends inquiry to genetic proclivity for survival ('evolvability').

 

Both investigators will submit detailed results for publication here after review in their respective peer literature.