Author: Publisher:
ISBN:
Category : Bull trout
Languages : en
Pages :
Book Description
Bull Trout Consultation for Snake River Section 7 Watershed
Author: A Watershed-scale Monitoring Protocol for Bull Trout
Author: Dan IsaakBull Trout Recovery Under the Endangered Species Act
Author: United States. Congress. Senate. Committee on Environment and Public Works. Subcommittee on Fisheries, Wildlife, and WaterPublisher:
ISBN:
Category : Law
Languages : en
Pages : 80
Book Description
Bull Trout Consultation for Imnaha River Section 7 Watershed (includes Big Sheep Creek and Imnaha River Watersheds)
Author: Demographic and Habitat Requirements for Conservation of Bull Trout
Author: Bruce E. RiemanPublisher:
ISBN:
Category : Bull trout
Languages : en
Pages : 44
Book Description
Bull Trout Consultation for Wallowa River Section 7 Watershed
Author: Bull Trout, Salvelinus Confluentus... Draft Recovery Plan, Chapter 24, Snake River Recovery Unit... U.S. Department Of The Interior
Author: Jarbridge River population of bull trout - truly threatened?
Author: United States. Congress. House. Committee on ResourcesPublisher:
ISBN:
Category : Bull trout
Languages : en
Pages : 68
Book Description
Evaluation of Bull Trout Movements in the Tucannon and Lower Snake Rivers, 2002-2006 Project Completion Summary
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 34
Book Description
The Columbia River Distinct Population Segment of bull trout (Salvelinus confluentus) was listed as threatened under the Endangered Species Act in 1998. One of the identified major threats to the species is fragmentation resulting from dams on over-wintering habitats of migratory subpopulations. A migratory subgroup in the Tucannon River appeared to utilize the Snake River reservoirs for adult rearing on a seasonal basis. As a result, a radio telemetry study was conducted on this subgroup from 2002-2006, to help meet Reasonable and Prudent Measures, and Conservation Recommendations associated with the lower Snake River dams in the FCRPS Biological Opinion, and to increase understanding of bull trout movements within the Tucannon River drainage. We sampled 1,109 bull trout in the Tucannon River; 124 of these were surgically implanted with radio tags and PIT tagged, and 681 were only PIT tagged. The remaining 304 fish were either recaptures, or released unmarked. Bull trout seasonal movements within the Tucannon River were similar to those described for other migratory bull trout populations. Bull trout migrated upstream in spring and early summer to the spawning areas in upper portions of the Tucannon River watershed. They quickly moved off the spawning areas in the fall, and either held or continued a slower migration downstream through the winter until early the following spring. During late fall and winter, bull trout were distributed in the lower half of the Tucannon River basin, down to and including the mainstem Snake River below Little Goose Dam. We were unable to adequately radio track bull trout in the Snake River and evaluate their movements or interactions with the federal hydroelectric dams for the following reasons: (1) none of our radio-tagged fish were detected attempting to pass a Snake River dam, (2) our radio tags had poor transmission capability at depths greater than 12.2 m, and (3) the sample size of fish that actually entered the Snake River was small (n=6). In spite of this project's shortcomings, bull trout continue to be observed in low numbers at Snake River dam fish facilities. It is highly possible that bull trout observed at the Snake River dam fish facilities are originating from sources other than the Tucannon River. We suggest that these fish might come from upstream sources like the Clearwater or Salmon rivers in Idaho, and are simply following the outmigration of juvenile anadromous fish (a food supply) as they emigrate toward the Pacific Ocean. Based on our study results, we recommend abandoning radio telemetry as a tool to monitor bull trout movements in the mainstem Snake River. We do recommend continuing PIT tagging and tag interrogation activities to help determine the origin of bull trout using the Snake River hydropower facilities. As a complementary approach, we also suggest the use of genetic assignment tests to help determine the origin of these fish. Lastly, several recommendations are included in the report to help manage and recover bull trout in the Tucannon subbasin.
Distribution and Movement of Bull Trout in the Upper Jarbidge River Watershed, Nevada
Author: U.S. Department of the InteriorPublisher: CreateSpace
ISBN: 9781497346789
Category : Nature
Languages : en
Pages : 86
Book Description
In 2006 and 2007, we surveyed the occurrence of bull trout (Salvelinus confluentus), the relative distributions of bull trout and redband trout (Oncorhynchus mykiss), and stream habitat conditions in the East and West Forks of the Jarbidge River in northeastern Nevada and southern Idaho. We installed passive integrated transponder (PIT) tag interrogation systems at strategic locations within the watershed, and PIT-tagged bull trout were monitored to evaluate individual fish growth, movement, and the connectivity of bull trout between streams. Robust bull trout populations were found in the upper portions of the East Fork Jarbidge River, the West Fork Jarbidge River, and in the Pine, Jack, Dave, and Fall Creeks. Small numbers of bull trout also were found in Slide and Cougar Creeks. Bull trout were numerically dominant in the upper portions of the East Fork Jarbidge River, and in Fall, Dave, Jack, and Pine Creeks, whereas redband trout were numerically dominant throughout the rest of the watershed. The relative abundance of bull trout was notably higher at altitudes above 2,100 m.