Tay District Salmon Fisheries Board

Protecting and Improving The Tay System

PROTECTING & IMPROVING THE TAY SYSTEM

TRYING TO UNDERSTAND THE NUMBERS OF SALMON WHICH SPAWN IN THE UPPER LYON

In conjunction with the Tay Rivers Trust and the University of the Highlands and Islands, the Board is involved in a salmon genetics project in the upper River Lyon. The upper River Lyon is an area affected by hydropower regulation and there have long been concerns that the survival of juvenile salmon may be less good in some areas than others. From samples of juvenile salmon obtained from the river by Board staff, it should be possible using genetic analyses to determine how many adult salmon spawned in an area. If areas with low numbers of juveniles have been derived from relatively high numbers of spawners, it will indicate poor juvenile survival and vice versa. It is hoped this should tell us whether an area subject to varying hydropower flows upstream of Stronuich Dam is worse or better for juvenile salmon survival than immediately downstream of that dam. It might also be used to confirm or otherwise a belief in some quarters that Lyon fish tend to spawn in greater density in the upper Lyon than in the lower Lyon. The tissue samples collected by Board staff are in the process of being analysed by UHI