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We used snorkel surveys and catch data to assess long-term effects of a catch and release (C and R) fishery imposed in 1989 on a population of stream-dwelling European grayling (Thymallus thymallus L.) in northern Sweden. From 1991 and onwards, catch (fish size ≥30cm) increased from less than two fish per day to more than seven in year 1999. A parallel increase in the grayling population size was...