The Grayling Research Trust

The Perceived Decline of Grayling in Yorkshire

Following a request by Steve Rhodes for investigation of a perceived decline in Yorkshire Dales grayling populations, The Grayling Research Trust sponsored an M.Sc. project at University of Hull. The student, David Johnson, has examined Environment Agency records and a wide range of environmental data to tackle this complicated problem. The study confirmed that there has been a decline in grayling populations over the last 15 years for specific rivers and locations. In addition, angling catch return data suggested that, on some rivers, grayling populations began to decline in the 1980s. Further work is needed to identify the possible causes for the change in these populations, although it seems likely the factors involved vary in their importance from river to river.

West Beck grayling