Laine, A., R. Kamula and J. Hooli (1998).  Fish and lamprey passage in a 
combined Denil and vertical slot fishway. Fisheries Management and Ecology.  
5:31-44.
	
A fishway (fish pass), consisting of vertical slot and Denil sections, was 
constructed at the lowest dam on the River Kemijoki, northern Finland, in 1993. 
The river was one of the best salmon rivers in Europe until 1949, when the dam 
and the hydropower plant were completed close to the river mouth. From 1993 to 
1995, nearly 1000 adult salmonids passed through the fishway despite heavy 
fishing below the dam. Of environmental variables measured, water temperature, 
headwater level, and discharge through the power plant in relation to season 
changes explained most of the variation in Baltic salmon, Salmo salar L., 
numbers. They had a minor effect on trout, Salmo trutta L. Migratory whitefish, 
Coregonus lavaretus (L.), entered the fishway but were not observed in its 
uppermost pool. River lamprey, Lampetra fluviatilis (L.), passed through the 
vertical slot section of the fishway after plastic bristles were fastened into 
the bottom of the slots.