Winter diel habitat use and movement by subadult bull trout in the upper Flathead River, Montana

North American Journal of Fisheries Management
By: , and 

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Abstract

We evaluated the diel habitat use and movement of subadult bull trout Salvelinus confluentus by use of radiotelemetry during winter in the upper Flathead River, Montana. Of the 13 monitored bull trout, 12 (92%) made at least one diel movement to other habitat locations during their respective day–night tracking surveys and moved an average of 73% of the time. The median distance moved from day to night locations by the mobile fish was 86 m (range, 27–594 m). Diel shifts in habitat use by nine of the tagged fish were related to light intensity; nocturnal emergence generally commenced immediately after the onset of night, and daytime concealment occurred at daybreak. When diel shifts in microhabitat use occurred, subadult bull trout moved from deep, midchannel areas during the day to shallow, low‐velocity areas along the channel margins without overhead cover at night. Resource managers who wish to protect the overwintering habitat features preferred by subadult bull trout in the upper Flathead River should use natural flow management strategies that maximize and stabilize channel margin habitats at night.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Winter diel habitat use and movement by subadult bull trout in the upper Flathead River, Montana
Series title North American Journal of Fisheries Management
DOI 10.1577/1548-8675(2003)023<0163:WDHUAM>2.0.CO;2
Volume 23
Issue 1
Year Published 2003
Language English
Publisher American Fisheries Society
Contributing office(s) Northern Rocky Mountain Science Center
Description 9 p.
First page 163
Last page 171
Country United States
State Montana
Other Geospatial Flathead River
Online Only (Y/N) N
Additional Online Files (Y/N) N
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