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Three populations of brook trout, Salvelinus fontinalis, established in   streams and reservoirs in the Jizerské Mountains, Czech Republic, were   studied between 1995 and 2006. The maximum age was usually 3+ to 4+, but the   age 7+ was also recorded. The inflows of all reservoirs are populated mostly   by 0+ to 2+ brook trout, while older specimens live in a lentic environment,   migrating to lotic habitats only to spawn. The density of brook trout in   streams ranged from 8 to 95 individuals per 100 m2 during spring and summer,   while that for reservoirs ranged between 31 and 290 individuals per ha. A   strong negative correlation between the size of adult fish and population   density in reservoirs was observed. The type of management influenced both   density and growth of brook trout. Further introduction of this species in   the central European area should be restricted to habitats where native   salmonids cannot survive, such as acidified waters

Evaluation of the temporal development of three introduced populations of brook trout, Salvelinus fontinalis, in Jizerské mountains, Czech Republic