Survival and life history differentiation in Sympatric European Grayling populations in Lesjaskogsvatnet
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- Master’s theses (MINA) 
The present study entitled “Survival and life history differentiation in Sympatric European Grayling populations in Lesjaskogsvatnet” deals with individual growth trajectories and adult mortality differences among grayling populations in Lesjaskogsvatnet. During this study 731 grayling scale samples from five different streams Steinbekken, Sandbekken, Søre Skotte, Valåe and Søre Hyrjon Lesjaskogsvatnet were taken. These five streams are the tributaries of Lake Lesjaskogsvatnet which is the feeding site for all the mature fish from different streams. Steinbekken, Sandbekken, Søre Skotte are warm streams and small whereas Valåe and Søre Hyrjon are cold and large. The grayling from warm streams grow rapidly up to 58 mm in the first winter and the slow growing grayling is up to 47 mm, which is less by 19 percent. The present studies show that life spans of warm stream fishes are shorter than the fish in the cold streams.