Bull Trout Migration Patterns

Unique Allacustrine Migration Patterns of a Bull Trout Population in the Pend Oreille River Drainage Idaho.

Bull trout migration patterns. Among the study basins median postspawning migration rates ranged from 04 to 30 kmday and duration ranged from 23 to. Temporal Spatial Variability Migration Patterns Juvenile Subadult Bull Trout Northeast Oregon Aquaculture and Fisheries Environmental Sciences. Bull trout are known to migrate from these headwater habitats to use Arrowrock Reservoir during the autumn winter and spring Flatter FIGURE 1Map of the Boise River basin Idaho showing.

Bull trout require cold clean water and have been. The typical directional pattern consists of migrating upstream to. Larger bull trout entered marine waters in late winter-early spring juveniles in late spring and most fish migrated back into rivers by late spring-early summer as temperatures were increasing.

Fifty-six 56 bull trout were tagged throughout a 270 km reach of the Salmon River from the town of North Fork ID upstream to Stanley ID. First migratory bull trout would use the SF Boise River to overwinter then move to the MFNF Boise River in the spring through spawning. 19082016 Bull trout in coastal Washington may display fluvial adfluvial and anadromous migration patterns Paragamian and Walters 2011 and both anadromous and non-anadromous individuals can occur in the.

19122019 Fry may remain in the stream bed for up to three weeks before emerging. Second bull trout occupy Arrowrock Reservoir in fall mid-September to mid-November and winter migrate upstream into the SF Boise River in spring March-. Migration patterns of adult bull trout in the Wenatchee River Washington 2000-2004.

Throughout their range bull trout co-occur in resident and migratory forms Rieman and McIntyre 1993. Increased river discharge and decreased water temperature appeared to be the primary environmental variables corresponding to the. This pattern is consistent with other bull trout populations AlChokhachy.

The initiation and duration of this migration varies including a protracted migration by adfluvial bull trout in the Flathead River from April-October and Metolius River May-October Fraley and. Fish and Wildlife Service Leavenworth Washington. Adult resident fish may be 150300 mm total length TL while adult migratory fish may grow to well over 600 mm Fraley and Shepard 1989.