140 THE SALMON RIVERS OF SCOTLAND 



but are maintained in order that fish may be conveniently 

 secured for ova stripping. The water of the Ugie is practically 

 free from all pollution, but in times of flood it becomes much 

 discoloured. A supply of water for the hatchery from a 

 separate source was, therefore, arranged for. An unexpected 

 mortality at first resulted, caused apparently from solutions 

 passing off from new cement work. 



