Original paper

Movements and habitat preferences of adult grayling (Thymallus thymallus L.) from late winter to summer in a boreal river

Nykänen, Mari; Huusko, Ari; Lahti, Markku


Radiotelemetry and hydraulic modelling were used to examine changes in the movement patterns and daytime habitat preferences of adult European grayling Thymallus thymallus L. (n= 12) between late winter and summer (12 April – 2 July 2001, water temperature 0 –19 °C). In the River Kuusinkijoki, Finland, grayling mostly remained within short ( 60 cm, water velocities 40 –70 cm s–1, and substrata dominated by particle sizes 0.07–128 mm. During summer, selection was for areas with depths 140 – 300 cm, velocities 40 –100 cm s–1, and particle sizes 16 – 256 mm.


graylingtelemetrythymallus thymallus lhabitat selectionhydraulic modelling