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Laine, A. (1990). The effects of a fishway model hydraulics on the ascend (sic) of vendace, whitefish and brown trout in Inari, northern Finland. Aqua Fennica. 20:191-198.

The behaviour of vendace, Coregonus albula , whitefish, C. lavaretus, C. pidschian, C. wartmanni , and brown trout, Salmo trutta, was studied in a 30 m long vertical slot fishway model in Inari, northern Finland. The discharge of the fishway was modifiable. Most of the fish ascended in the smallest test discharge. Improper energy dissipation, high drops between pools (20-30 cm), high velocities (over 1.4 m/s) and swirling of the water in the pools delayed or prevented the passage of vendace and whitefish. Water velocity at the most favourable resting areas corresponded to 1/2-1 fish body lengths per second (Bls^-1), but even areas with a velocity of 2-4 Bls^-1 were used. Although the pool dimensions were similar, there were differences in the flow characteristics of the pools and slots. Certain pools seemed to be popular at each discharge rate, in some pools the flow conditions changed remarkably between discharge rates affecting the behaviour of the fish. Learning played an important role as the fish ascended the fishway