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Occurrence of Cryptocotyle lingua rediae was recorded in periwinkle samples collected adjacent to 10 charr farms and at control sites 1 to 5 km from the farms. In 7 out of 10 localities the prevalence of infection was higher in the sample taken adjacent to the farm than in the control, and overall prevalence was 13.7 O/O in periwinkles near the farms and 6.1 % in snails from the control sites, a highly significant difference. Prevalences in periwinkles close to farms tended to increase withdoi:10.3354/dao012059 fatcat:yp6fhfynyrh6xp3w7byefv7xoe