Summer mark and recapture experiments were performed on the brown trout (Salmo trutta), population of the Pine River, Michigan. Three 427-m sections were divided into seven 61-m stations, and trout over 15 cm in total length from each station were marked distinctively. Even though the population density of brown trout over 15 cm in total length decreased approximately 50% from 1968 to 1969, trout movement patterns did not change. Brown trout oriented their movements around the station of original capture in both years. If a positive relationship between movement and population density exists, it exists at densities exceeding 209 trout per hectare.
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