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Grayling, Thymallus thymallus, became locally extinct in Lagan around the 1950s due to human activity. Now, 70 years later, The Swedish Anglers Association is trying to re-establish a popula- tion in Lagan by releasing the fish in a tributary river, Krokån. This paper investigates the eco- logical challenges that this project faces. I conclude that the water temperature could pose a big problem
