Abstract
Mean displacement rates (net linear displacement between samples/time interval between samples) of 22 lake trout ( Salvelinus namaycush) externally tagged with ultrasonic transmitters in two connected high mountain lakes in central Colorado ranged from 1.1 m/min in fall to 1.6 m/min in summer. Mean daily displacement rates were significantly higher between 08.30 and 11.30 h than between 22.80 and 05.00 h during spring, summer and fall. Displacement rates of individual fish were highly variable, ranging from 0 to 28 m/min. Home ranges of lake trout were larger during spring, summer and fall (mean area 199.0, 161.8, 172.6 ha, respectively) than during winter (61.9 ha). There was no apparent relationship between fish size and home range size. Tagged fish utilized 11 to 40% of the suitable habitat during different seasons.
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