The majority of interior subspecies of cutthroat trout Oncorhynchus clarkii have been
extirpated from large rivers by anthropogenic activities that have fragmented habitats and
introduced nonnative competitors. Selective pressures against migratory behaviors and
main-stem river occupation, coupled with conservation strategies that isolate genetically
pure populations above barriers, have restricted gene flow and prevented expression of the
fluvial life history in many populations. Existing knowledge about the movements and home …

Most interior cutthroat trout subspecies have been extirpated from large rivers by
anthropogenic activities that have fragmented habitats and introduced non-native
competitors. Selective pressures against migratory behaviors have prevented the
expression of fluvial life history traits, and little is therefore known about the spatial
requirements of fluvial populations. We used telemetry to track 55 fluvial Bonneville cutthroat
trout (BCT) in the Thomas Fork River from October to April of 1999/2000 and 2000/2001 …