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• 1. [Article] Proceedings of the Wild Trout - Catchable Trout Symposium

  Abstract -- None

  Citation × Citation Citation Abstract Copy Title: Proceedings of the Wild Trout - Catchable Trout Symposium Abstract -- None Title: Proceedings of the Wild Trout - Catchable Trout Symposium Abstract -- None Close

• 2. [Article] NF - Effect of Bull Trout and Brook Trout Interactions on Foraging Habitat, Feeding Behavior, and Growth

  Abstract -- Observations of free-ranging sympatric bull trout Salvelinus confluentus and nonnative brook trout S. fontinalis in two eastern Oregon headwater streams provided little evidence of habitat ...

  Citation × Citation Citation Abstract Copy Title: NF - Effect of Bull Trout and Brook Trout Interactions on Foraging Habitat, Feeding Behavior, and Growth Abstract -- Observations of free-ranging sympatric bull trout Salvelinus confluentus and nonnative brook trout S. fontinalis in two eastern Oregon headwater streams provided little evidence of habitat partitioning. Both species held focal feeding points in similar microhabitats and fed primarily from the water column rather than from the surface or benthos. In an instream experiment, 20 enclosures were assigned one of three treatments: two bull trout, four bull trout, or a mix of two bull trout and two brook trout. In the enclosures, macroinvertebrate drift was restricted and trout densities were elevated, creating an environment of reduced food and habitat resources. Under these conditions, there was no indication of a niche shift by bull trout; feeding behavior and habitat use by bull trout did not differ depending on the presence or absence of brook trout. Brook trout in the mixed-species treatment were the most aggressive, maintained dominance in 75% of the enclosures, and exhibited significantly higher growth than sympatric bull trout. However, the effects of intra-and interspecific interactions on bull trout growth were equivalent. Given the absence of resource partitioning and a niche shift by bull trout in the presence of brook trout (despite obvious interference interactions), we suggest that the displacement of bull trout by brook trout is likely when resources are scarce. Title: NF - Effect of Bull Trout and Brook Trout Interactions on Foraging Habitat, Feeding Behavior, and Growth Abstract -- Observations of free-ranging sympatric bull trout Salvelinus confluentus and nonnative brook trout S. fontinalis in two eastern Oregon headwater streams provided little evidence of habitat partitioning. Both species held focal feeding points in similar microhabitats and fed primarily from the water column rather than from the surface or benthos. In an instream experiment, 20 enclosures were assigned one of three treatments: two bull trout, four bull trout, or a mix of two bull trout and two brook trout. In the enclosures, macroinvertebrate drift was restricted and trout densities were elevated, creating an environment of reduced food and habitat resources. Under these conditions, there was no indication of a niche shift by bull trout; feeding behavior and habitat use by bull trout did not differ depending on the presence or absence of brook trout. Brook trout in the mixed-species treatment were the most aggressive, maintained dominance in 75% of the enclosures, and exhibited significantly higher growth than sympatric bull trout. However, the effects of intra-and interspecific interactions on bull trout growth were equivalent. Given the absence of resource partitioning and a niche shift by bull trout in the presence of brook trout (despite obvious interference interactions), we suggest that the displacement of bull trout by brook trout is likely when resources are scarce. Close

• 3. [Article] Threemile Creek Bull Trout Protection Final Report 1998

  Abstract -- Brook Trout were removed from Threemile Creek by electrofishing and night-snorkel spear-fishing. Electrofishing removal was conducted on 11 reaches and a total of 45 passes were completed. ...

  Citation × Citation Citation Abstract Copy Title: Threemile Creek Bull Trout Protection Final Report 1998 Abstract -- Brook Trout were removed from Threemile Creek by electrofishing and night-snorkel spear-fishing. Electrofishing removal was conducted on 11 reaches and a total of 45 passes were completed. Fifty brook trout were removed. Night-snorkeling was conducted in the five reach, intergrade zone where both bull and brook trout were found. Two comprehenzive passes were completed in the first three reaches, and three passes were completed in the last two reaches. A total of 10 brook trout and 8 brook/bull trout hybrids were removed. Additionally 39 brook trout were removed from a fire pond above Threemile Creek. Mollusk and amphibian surveys were also conducted; and temperature was collected in the Threemile Creek Project Area. Title: Threemile Creek Bull Trout Protection Final Report 1998 Abstract -- Brook Trout were removed from Threemile Creek by electrofishing and night-snorkel spear-fishing. Electrofishing removal was conducted on 11 reaches and a total of 45 passes were completed. Fifty brook trout were removed. Night-snorkeling was conducted in the five reach, intergrade zone where both bull and brook trout were found. Two comprehenzive passes were completed in the first three reaches, and three passes were completed in the last two reaches. A total of 10 brook trout and 8 brook/bull trout hybrids were removed. Additionally 39 brook trout were removed from a fire pond above Threemile Creek. Mollusk and amphibian surveys were also conducted; and temperature was collected in the Threemile Creek Project Area. Close

• 4. [Article] Threemile Creek Bull Trout Protection, 1997 Final Report (OWEB #97-112-007)

  Abstract -- Brook trout removal activities were conducted on Threemile Creek beginning in late June, and ending in late September 1997. Removal efforts consisted of electrofishing in the brook trout zone ...

  Citation × Citation Citation Abstract Copy Title: Threemile Creek Bull Trout Protection, 1997 Final Report (OWEB #97-112-007) Abstract -- Brook trout removal activities were conducted on Threemile Creek beginning in late June, and ending in late September 1997. Removal efforts consisted of electrofishing in the brook trout zone and night snorkel spearing in the bull trout intergrade zone (both brook trout and bull trout present). A total of 121 brook trout and one hybrid were removed by electrofishing. Of the 121 brook trout removed, 92 were greater than 90 mm in length. During night snorkel spearing 10 brook trout and 8 hybrids were removed and a total of 54 bull trout were observed. Macroinvertebrate and amphibian surveys were conducted in early September, and temparature was monitored throughout the project area. Experimental trapping was conducted, but no fish were collected during any trapping effort. Title: Threemile Creek Bull Trout Protection, 1997 Final Report (OWEB #97-112-007) Abstract -- Brook trout removal activities were conducted on Threemile Creek beginning in late June, and ending in late September 1997. Removal efforts consisted of electrofishing in the brook trout zone and night snorkel spearing in the bull trout intergrade zone (both brook trout and bull trout present). A total of 121 brook trout and one hybrid were removed by electrofishing. Of the 121 brook trout removed, 92 were greater than 90 mm in length. During night snorkel spearing 10 brook trout and 8 hybrids were removed and a total of 54 bull trout were observed. Macroinvertebrate and amphibian surveys were conducted in early September, and temparature was monitored throughout the project area. Experimental trapping was conducted, but no fish were collected during any trapping effort. Close

• 5. [Article] Oregon's Trout Plan: A Plan for the Management of Oregon's Trout 1987

  Abstract -- The Statewide Trout Management Plan is part of the Oregon Department of Fish and Wildlife's (ODFW) planning program to provide a comprehensive, systematic, long-term approach to the management ...

  Citation × Citation Citation Abstract Copy Title: Oregon's Trout Plan: A Plan for the Management of Oregon's Trout 1987 Abstract -- The Statewide Trout Management Plan is part of the Oregon Department of Fish and Wildlife's (ODFW) planning program to provide a comprehensive, systematic, long-term approach to the management of Oregon's fish resources. The Plan contains specific goals, objectives, strategies, and guidelines for the statewide management of trout, which are based on state laws, as well as general goals and policies adopted by the Oregon Fish and Wildlife Commission, (hereafter referred to as the Commission). In turn, the Plan provides direction for basin, subbasin, and mini plans developed for individual rivers and water bodies. The relationship of the Statewide Trout Management Plan to other ODFW plans is further discussed in Appendix A. This Statewide Management Plan will direct future trout management and will be reviewed in 6 years. The plan contains brief descriptions of Oregon's trout waters, species, anglers, and economic consequences. The importance of habitat and the use of angling regulations are also discussed. The plan covers all species of native and introduced resident trout and Pacific salmon that are managed in the resident trout program (Atlantic salmon, kokanee, coho salmon, and Chinook salmon) and the anadromous form (searun) of cutthroat trout. Appendix B contains a complete list of fish treated as trout in the plan. Title: Oregon's Trout Plan: A Plan for the Management of Oregon's Trout 1987 Abstract -- The Statewide Trout Management Plan is part of the Oregon Department of Fish and Wildlife's (ODFW) planning program to provide a comprehensive, systematic, long-term approach to the management of Oregon's fish resources. The Plan contains specific goals, objectives, strategies, and guidelines for the statewide management of trout, which are based on state laws, as well as general goals and policies adopted by the Oregon Fish and Wildlife Commission, (hereafter referred to as the Commission). In turn, the Plan provides direction for basin, subbasin, and mini plans developed for individual rivers and water bodies. The relationship of the Statewide Trout Management Plan to other ODFW plans is further discussed in Appendix A. This Statewide Management Plan will direct future trout management and will be reviewed in 6 years. The plan contains brief descriptions of Oregon's trout waters, species, anglers, and economic consequences. The importance of habitat and the use of angling regulations are also discussed. The plan covers all species of native and introduced resident trout and Pacific salmon that are managed in the resident trout program (Atlantic salmon, kokanee, coho salmon, and Chinook salmon) and the anadromous form (searun) of cutthroat trout. Appendix B contains a complete list of fish treated as trout in the plan. Close

• 6. [Article] Lake Billy Chinook Creel Survey, Boat and Bank Anglers - 2009 Estimated Catch and Effort, Sampled Catch and Effort, and Estimated Catch Rates

  Abstract -- Lake Billy Chinook Creel Survey, Boat and Bank Anglers - March 1-October 31, 2009

  Citation × Citation Citation Abstract Copy Title: Lake Billy Chinook Creel Survey, Boat and Bank Anglers - 2009 Estimated Catch and Effort, Sampled Catch and Effort, and Estimated Catch Rates Abstract -- Lake Billy Chinook Creel Survey, Boat and Bank Anglers - March 1-October 31, 2009 Title: Lake Billy Chinook Creel Survey, Boat and Bank Anglers - 2009 Estimated Catch and Effort, Sampled Catch and Effort, and Estimated Catch Rates Abstract -- Lake Billy Chinook Creel Survey, Boat and Bank Anglers - March 1-October 31, 2009 Close

• 7. [Article] Lake Billy Chinook Creel Survey, Boat and Bank Anglers - 2010 Estimated Catch and Effort, Sampled Catch and Effort, and Estimated Catch Rates

  Abstract -- Lake Billy Chinook Creel Survey, Boat and Bank Anglers - March 1-October 31, 2010

  Citation × Citation Citation Abstract Copy Title: Lake Billy Chinook Creel Survey, Boat and Bank Anglers - 2010 Estimated Catch and Effort, Sampled Catch and Effort, and Estimated Catch Rates Abstract -- Lake Billy Chinook Creel Survey, Boat and Bank Anglers - March 1-October 31, 2010 Title: Lake Billy Chinook Creel Survey, Boat and Bank Anglers - 2010 Estimated Catch and Effort, Sampled Catch and Effort, and Estimated Catch Rates Abstract -- Lake Billy Chinook Creel Survey, Boat and Bank Anglers - March 1-October 31, 2010 Close

• 8. [Article] Migratory Patterns, Structure, Abundance, and Status of Bull Trout Populations from Subbasins in the Columbia Plateau and Blue Mountain Provinces, 2005 Annual Report

  Abstract -- Methods of estimating the abundance of adult bull trout, migration and temperature patterns of adult bull trout in the Lostine River, seasonal movements of subadult fluvial bull trout in Mill ...

  Citation × Citation Citation Abstract Copy Title: Migratory Patterns, Structure, Abundance, and Status of Bull Trout Populations from Subbasins in the Columbia Plateau and Blue Mountain Provinces, 2005 Annual Report Abstract -- Methods of estimating the abundance of adult bull trout, migration and temperature patterns of adult bull trout in the Lostine River, seasonal movements of subadult fluvial bull trout in Mill Creek, spatial distribution of bull trout Redds in the John Day basin and evaluation of various statistical sampling designs, analysis and synthesis of project results, life history of Mill Creek fluvial bull trout using PIT tags and cohort analysis. Title: Migratory Patterns, Structure, Abundance, and Status of Bull Trout Populations from Subbasins in the Columbia Plateau and Blue Mountain Provinces, 2005 Annual Report Abstract -- Methods of estimating the abundance of adult bull trout, migration and temperature patterns of adult bull trout in the Lostine River, seasonal movements of subadult fluvial bull trout in Mill Creek, spatial distribution of bull trout Redds in the John Day basin and evaluation of various statistical sampling designs, analysis and synthesis of project results, life history of Mill Creek fluvial bull trout using PIT tags and cohort analysis. Close

• 9. [Article] MWBTRP - Middle Fork Willamette Basin Bull Trout Rehabilitation and Monitoring Project, Annual Progress Report 2005

  Abstract -- Bull trout in the Middle Fork Willamette Basin once moved uninhibited back and forth from spawning and rearing habitats near Diamond Peak to foraging and overwintering habitats lower in the ...

  Citation × Citation Citation Abstract Copy Title: MWBTRP - Middle Fork Willamette Basin Bull Trout Rehabilitation and Monitoring Project, Annual Progress Report 2005 Abstract -- Bull trout in the Middle Fork Willamette Basin once moved uninhibited back and forth from spawning and rearing habitats near Diamond Peak to foraging and overwintering habitats lower in the basin. Construction of Dexter, Lookout Point and Hills Creek dams in the 1950s and 1960s without fish passage fragmented the habitat and limited the range of the population to above Hills Creek Dam. This population declined and the last confirmed bull trout sighting above Hills Creek dam was a photograph taken by an angler in 1990. Buchanan et al. (1997) described bull trout in the Middle Fork Willamette River as “probably extinct” after extensive surveys from 1993 through 1997 failed to observe any bull trout. In 1997 the US Forest Service and the Oregon Department of Fish and Wildlife began a program to reestablish bull trout in the Middle Fork Willamette. More than 10,000 bull trout fry have been transferred from the relatively healthy McKenzie population to the Middle Fork Willamette River. Adult bull trout are once again present in the Middle Fork Willamette, although natural reproduction has not been documented. Title: MWBTRP - Middle Fork Willamette Basin Bull Trout Rehabilitation and Monitoring Project, Annual Progress Report 2005 Abstract -- Bull trout in the Middle Fork Willamette Basin once moved uninhibited back and forth from spawning and rearing habitats near Diamond Peak to foraging and overwintering habitats lower in the basin. Construction of Dexter, Lookout Point and Hills Creek dams in the 1950s and 1960s without fish passage fragmented the habitat and limited the range of the population to above Hills Creek Dam. This population declined and the last confirmed bull trout sighting above Hills Creek dam was a photograph taken by an angler in 1990. Buchanan et al. (1997) described bull trout in the Middle Fork Willamette River as “probably extinct” after extensive surveys from 1993 through 1997 failed to observe any bull trout. In 1997 the US Forest Service and the Oregon Department of Fish and Wildlife began a program to reestablish bull trout in the Middle Fork Willamette. More than 10,000 bull trout fry have been transferred from the relatively healthy McKenzie population to the Middle Fork Willamette River. Adult bull trout are once again present in the Middle Fork Willamette, although natural reproduction has not been documented. Close

• 10. [Article] 2012 Metolius Basin bull trout redd counts

  Abstract -- Bull trout are indigenous to the Metolius River basin; however, they were managed as a nuisance species due to their interactions with anadromous sportfish for several decades. In 1960, nuisance ...

  Citation × Citation Citation Abstract Copy Title: 2012 Metolius Basin bull trout redd counts Abstract -- Bull trout are indigenous to the Metolius River basin; however, they were managed as a nuisance species due to their interactions with anadromous sportfish for several decades. In 1960, nuisance management of bull trout ended and protection of bull trout began in 1983 with mandatory catch and release regulations throughout the Metolius River basin. In 1986, the Department initiated annual redd counts for bull trout throughout the basin to document the species status. Redd surveys showed low spawning numbers, and the Department responded by closing all tributaries downstream of Lake Creek to fishing in 1994. A Threatened listing of Columbia River bull trout under the Endangered Species Act in 1998 followed the fishery closure (Fies et al. 1996 and Lohr et al. ####). Bull trout redd counts continue in the basin in accordance with the goals of the Native Fish Conservation Policy. Title: 2012 Metolius Basin bull trout redd counts Abstract -- Bull trout are indigenous to the Metolius River basin; however, they were managed as a nuisance species due to their interactions with anadromous sportfish for several decades. In 1960, nuisance management of bull trout ended and protection of bull trout began in 1983 with mandatory catch and release regulations throughout the Metolius River basin. In 1986, the Department initiated annual redd counts for bull trout throughout the basin to document the species status. Redd surveys showed low spawning numbers, and the Department responded by closing all tributaries downstream of Lake Creek to fishing in 1994. A Threatened listing of Columbia River bull trout under the Endangered Species Act in 1998 followed the fishery closure (Fies et al. 1996 and Lohr et al. ####). Bull trout redd counts continue in the basin in accordance with the goals of the Native Fish Conservation Policy. Close

• 11. [Article] 2011 Metolius River subbasin bull trout redd counts

  Abstract -- Bull trout are indigenous to the Metolius River basin; however, they were managed as a nuisance species due to their interactions with anadromous sportfish for several decades. In 1960, nuisance ...

  Citation × Citation Citation Abstract Copy Title: 2011 Metolius River subbasin bull trout redd counts Abstract -- Bull trout are indigenous to the Metolius River basin; however, they were managed as a nuisance species due to their interactions with anadromous sportfish for several decades. In 1960, nuisance management of bull trout ended and protection of bull trout began in 1983 with mandatory catch and release regulations throughout the Metolius River basin. In 1986, the Department initiated annual redd counts for bull trout throughout the basin to document the species status. Redd surveys showed low spawning numbers, and the Department responded by closing all tributaries downstream of Lake Creek to fishing in 1994. A Threatened listing of Columbia River bull trout under the Endangered Species Act in 1998 followed the fishery closure (Fies et al. 1996 and Lohr et al. ####). Bull trout redd counts continue in the basin in accordance with the goals of the Native Fish Conservation Policy. Title: 2011 Metolius River subbasin bull trout redd counts Abstract -- Bull trout are indigenous to the Metolius River basin; however, they were managed as a nuisance species due to their interactions with anadromous sportfish for several decades. In 1960, nuisance management of bull trout ended and protection of bull trout began in 1983 with mandatory catch and release regulations throughout the Metolius River basin. In 1986, the Department initiated annual redd counts for bull trout throughout the basin to document the species status. Redd surveys showed low spawning numbers, and the Department responded by closing all tributaries downstream of Lake Creek to fishing in 1994. A Threatened listing of Columbia River bull trout under the Endangered Species Act in 1998 followed the fishery closure (Fies et al. 1996 and Lohr et al. ####). Bull trout redd counts continue in the basin in accordance with the goals of the Native Fish Conservation Policy. Close

• 12. [Article] 2010 Metolius Basin bull trout redds

  Abstract -- Bull trout are indigenous to the Metolius River basin; however, they were managed as a nuisance species due to their interactions with anadromous sportfish for several decades. In 1960, nuisance ...

  Citation × Citation Citation Abstract Copy Title: 2010 Metolius Basin bull trout redds Abstract -- Bull trout are indigenous to the Metolius River basin; however, they were managed as a nuisance species due to their interactions with anadromous sportfish for several decades. In 1960, nuisance management of bull trout ended and protection of bull trout began in 1983 with mandatory catch and release regulations throughout the Metolius River basin. In 1986, the Department initiated annual redd counts for bull trout throughout the basin to document the species status. Redd surveys showed low spawning numbers, and the Department responded by closing all tributaries downstream of Lake Creek to fishing in 1994. A Threatened listing of Columbia River bull trout under the Endangered Species Act in 1998 followed the fishery closure (Fies et al. 1996 and Lohr et al. ####). Bull trout redd counts continue in the basin in accordance with the goals of the Native Fish Conservation Policy. Title: 2010 Metolius Basin bull trout redds Abstract -- Bull trout are indigenous to the Metolius River basin; however, they were managed as a nuisance species due to their interactions with anadromous sportfish for several decades. In 1960, nuisance management of bull trout ended and protection of bull trout began in 1983 with mandatory catch and release regulations throughout the Metolius River basin. In 1986, the Department initiated annual redd counts for bull trout throughout the basin to document the species status. Redd surveys showed low spawning numbers, and the Department responded by closing all tributaries downstream of Lake Creek to fishing in 1994. A Threatened listing of Columbia River bull trout under the Endangered Species Act in 1998 followed the fishery closure (Fies et al. 1996 and Lohr et al. ####). Bull trout redd counts continue in the basin in accordance with the goals of the Native Fish Conservation Policy. Close

• 13. [Article] Florence area stocked trout evaluation, 1993

  Abstract -- This study evaluates the hatchery rainbow trout program for seventeen dunal lakes in the Siuslaw Fish District near Florence, Oregon (Figure 1). The contribution of stocking rainbow trout in ...

  Citation × Citation Citation Abstract Copy Title: Florence area stocked trout evaluation, 1993 Abstract -- This study evaluates the hatchery rainbow trout program for seventeen dunal lakes in the Siuslaw Fish District near Florence, Oregon (Figure 1). The contribution of stocking rainbow trout in coastal lakes of Oregon has not been systematically evaluated to determine the amount of recreation provided or the catch rate of the hatchery product. Estimates of the angler catch and effort from this study will be used to meet the following three objectives: 1: Describe the current fishery at 17 mid-coast Oregon dunal lakes arid make recommendations to improve the program to increase angler satisfaction. 2: determine the utilization rate and overall contribution of hatchery trout compared to the Oregon Trout Plan statewide goal of a minimum 40¼ catch of hatchery fish. 3: Determine the hatchery trout contribution to the fisheries compared to native trout in lakes with both present. Title: Florence area stocked trout evaluation, 1993 Abstract -- This study evaluates the hatchery rainbow trout program for seventeen dunal lakes in the Siuslaw Fish District near Florence, Oregon (Figure 1). The contribution of stocking rainbow trout in coastal lakes of Oregon has not been systematically evaluated to determine the amount of recreation provided or the catch rate of the hatchery product. Estimates of the angler catch and effort from this study will be used to meet the following three objectives: 1: Describe the current fishery at 17 mid-coast Oregon dunal lakes arid make recommendations to improve the program to increase angler satisfaction. 2: determine the utilization rate and overall contribution of hatchery trout compared to the Oregon Trout Plan statewide goal of a minimum 40¼ catch of hatchery fish. 3: Determine the hatchery trout contribution to the fisheries compared to native trout in lakes with both present. Close

• 14. [Article] Timing and Location of Spawning by Bull Trout and Kokanee in the Odell Lake Watershed and Heising Spring of the Metolius River Watershed, 2003-04.

  Abstract -- Although the present size of the bull trout population within the Odell Lake Recovery Unit is unknown, it appears to be quite small. Spawning by bull trout of the Odell Lake Recovery Unit occurs ...

  Citation × Citation Citation Abstract Copy Title: Timing and Location of Spawning by Bull Trout and Kokanee in the Odell Lake Watershed and Heising Spring of the Metolius River Watershed, 2003-04. Abstract -- Although the present size of the bull trout population within the Odell Lake Recovery Unit is unknown, it appears to be quite small. Spawning by bull trout of the Odell Lake Recovery Unit occurs only in the lower 0.8 km of Trapper Creek, below a falls presumed to be a barrier. Numbers of redds observed in Trapper Creek from 1996 through 2002 have ranged from one to 24. In addition to genetic effects caused by small population size, primary threats to the sustainability of these bull trout include limited spawning and rearing habitat in all streams, hybridization with brook trout in upper Trapper Creek, competition from other fish species, particularly lake trout in Odell Lake, and superimposition of kokanee salmon (O. nerka) redds on bull trout redds. The latter threat may be particularly detrimental because of the large number of kokanee that spawn in lower Trapper Creek. To address concerns of bull trout redd superimposition by bull trout, we designed studies to: 1) Assess the impacts to bull trout reproduction caused by kokanee that spawn at the same location, and 2) Develop acceptable methods to separate bull trout and kokanee that spawn in Trapper Creek, Odell Lake. The first objective will address the concerns that kokanee redds superimposed on bull trout redds will reduce the number of bull trout progeny. During the spawning season, we will cap several undisturbed bull trout redds and an equal number of redds superimposed with kokanee salmon redds. Emergent fry will be captured, identified, and enumerated; statistical comparisons of fry abundance will be made between both groups of redds. To adjust for spawner fecundity, estimates of the size of females that make each redd will be obtained visually. We intend to conduct these studies at Heising Springs on the Metolius River, which helps support one of the healthiest bull trout populations in Oregon. The second objective addresses efforts to enhance the Odell Lake bull trout population. Recently, managers installed a weir to block passage of kokanee salmon to spawning areas in Trapper Creek; bull trout were captured and placed upstream. This activity led to opposition by anglers supportive of kokanee and loss of adult bull trout by an otter that invaded the trap. Our intent is to help managers design and implement methods that 1) prevent kokanee salmon from impacting bull trout redds in Trapper Creek, 2) enable bull trout to move into and out of Trapper Creek without capture and handling, and 3) enumerate bull trout spawning in Trapper Creek. Data collected in Trapper Creek should help with design and implementation of methodologies to separate the species during the spawning season. Title: Timing and Location of Spawning by Bull Trout and Kokanee in the Odell Lake Watershed and Heising Spring of the Metolius River Watershed, 2003-04. Abstract -- Although the present size of the bull trout population within the Odell Lake Recovery Unit is unknown, it appears to be quite small. Spawning by bull trout of the Odell Lake Recovery Unit occurs only in the lower 0.8 km of Trapper Creek, below a falls presumed to be a barrier. Numbers of redds observed in Trapper Creek from 1996 through 2002 have ranged from one to 24. In addition to genetic effects caused by small population size, primary threats to the sustainability of these bull trout include limited spawning and rearing habitat in all streams, hybridization with brook trout in upper Trapper Creek, competition from other fish species, particularly lake trout in Odell Lake, and superimposition of kokanee salmon (O. nerka) redds on bull trout redds. The latter threat may be particularly detrimental because of the large number of kokanee that spawn in lower Trapper Creek. To address concerns of bull trout redd superimposition by bull trout, we designed studies to: 1) Assess the impacts to bull trout reproduction caused by kokanee that spawn at the same location, and 2) Develop acceptable methods to separate bull trout and kokanee that spawn in Trapper Creek, Odell Lake. The first objective will address the concerns that kokanee redds superimposed on bull trout redds will reduce the number of bull trout progeny. During the spawning season, we will cap several undisturbed bull trout redds and an equal number of redds superimposed with kokanee salmon redds. Emergent fry will be captured, identified, and enumerated; statistical comparisons of fry abundance will be made between both groups of redds. To adjust for spawner fecundity, estimates of the size of females that make each redd will be obtained visually. We intend to conduct these studies at Heising Springs on the Metolius River, which helps support one of the healthiest bull trout populations in Oregon. The second objective addresses efforts to enhance the Odell Lake bull trout population. Recently, managers installed a weir to block passage of kokanee salmon to spawning areas in Trapper Creek; bull trout were captured and placed upstream. This activity led to opposition by anglers supportive of kokanee and loss of adult bull trout by an otter that invaded the trap. Our intent is to help managers design and implement methods that 1) prevent kokanee salmon from impacting bull trout redds in Trapper Creek, 2) enable bull trout to move into and out of Trapper Creek without capture and handling, and 3) enumerate bull trout spawning in Trapper Creek. Data collected in Trapper Creek should help with design and implementation of methodologies to separate the species during the spawning season. Close

• 15. [Article] Native Trout Studies, 2001

  Abstract -- Summary: We radio-tagged 34 adult westslope cutthroat trout in Rail Creek and Roberts Creek in the mainstem John Day River subbasin. These fish were located weekly by telemetry, as were those ...

  Citation × Citation Citation Abstract Copy Title: Native Trout Studies, 2001 Abstract -- Summary: We radio-tagged 34 adult westslope cutthroat trout in Rail Creek and Roberts Creek in the mainstem John Day River subbasin. These fish were located weekly by telemetry, as were those with active transmitters applied in 2000, to determine seasonal movements. Habitat measurements were collected at each re-location of each radio-tagged fish to determine their seasonal habitat preferences. We collected tissue samples from westslope cutthroat trout and rainbow trout in two streams for genetic description of the populations, and to determine the extent of hybridization between the two species. We helped survey Davis Creek, tributary to the Middle Fork John Day River, to determine whether bull trout were present Title: Native Trout Studies, 2001 Abstract -- Summary: We radio-tagged 34 adult westslope cutthroat trout in Rail Creek and Roberts Creek in the mainstem John Day River subbasin. These fish were located weekly by telemetry, as were those with active transmitters applied in 2000, to determine seasonal movements. Habitat measurements were collected at each re-location of each radio-tagged fish to determine their seasonal habitat preferences. We collected tissue samples from westslope cutthroat trout and rainbow trout in two streams for genetic description of the populations, and to determine the extent of hybridization between the two species. We helped survey Davis Creek, tributary to the Middle Fork John Day River, to determine whether bull trout were present Close

• 16. [Article] Migration and Passage of Redband Trout in the Donner und Blitzen River, 2007-2009, Information Reports Number 2009-05

  Abstract -- Movement of redband trout (Oncorhynchus mykiss gairdneri) was tracked between March 2007 and June 2009 in the Donner und Blitzen River (Blitzen River). We had three primary study objectives: ...

  Citation × Citation Citation Abstract Copy Title: Migration and Passage of Redband Trout in the Donner und Blitzen River, 2007-2009, Information Reports Number 2009-05 Abstract -- Movement of redband trout (Oncorhynchus mykiss gairdneri) was tracked between March 2007 and June 2009 in the Donner und Blitzen River (Blitzen River). We had three primary study objectives: 1) examine redband trout spawning locations and spawning migration timing, 2) evaluate redband trout passage at diversion dams, and 3) investigate seasonal migration patterns of redband trout as they relate to stream temperature dynamics. We tagged 96 redband trout with radio transmitters and 706 with PIT tags. Radio tracking included both mobile and fixed station detections. We established PIT tag readers at Cato Bridge (Rkm 1), Busse Dam (Rkm 35), Grain Camp Dam (Rkm 48), and Page Dam (Rkm 76) for additional data on large-scale movement patterns. With the PIT antennas at the three diversion dams, we placed one antenna below the dam and one at the upstream exit of the fish ladders to evaluate the passage delays at each dam. Stream temperature was recorded at 10 locations in the Blitzen River throughout the study. Scales of 257 migratory trout were interpreted for age and spawning history. Our results indicated that the majority of Blitzen redband trout migrated upstream of Page Dam to spawn and that most trout spawned in the mainstem and not the tributaries. Upstream trout migration occurred from March to July, but the peak migration occurred during late April and early May. Passage problems were recorded at two of the three dams evaluated. Trout were delayed longest at Busse Dam and 44% of radio-tagged trout that approached the dam were never able to pass. Trout experienced less delay at Grain Camp Dam and only 8% of radio-tagged trout failed to pass the dam. At Page Dam, which has a recently upgraded fish ladder, trout delays were short and only 5% of trout that approached the dam were unable to pass. Potentially stressful or lethal temperatures (>24.3°C) were recorded at all monitoring locations downstream of Fish Creek, except at the site just below Page Springs. The migratory population ranged in age from 1+ to 5+, but only age 3+ and older trout were reproductively mature. This suggests that the spring upstream migration includes both adult trout seeking suitable spawning habitats and immature trout making a seasonal habitat shift for thermal refuge. A fraction of the PIT-tagged fish were observed to make two or three migrations from below Busse Dam to above Page Dam in the spring and returning back to the lower river in the fall. We recommend prioritizing fish passage at the Busse Dam and Grain Camp Dam for conservation and enhancement efforts. Title: Migration and Passage of Redband Trout in the Donner und Blitzen River, 2007-2009, Information Reports Number 2009-05 Abstract -- Movement of redband trout (Oncorhynchus mykiss gairdneri) was tracked between March 2007 and June 2009 in the Donner und Blitzen River (Blitzen River). We had three primary study objectives: 1) examine redband trout spawning locations and spawning migration timing, 2) evaluate redband trout passage at diversion dams, and 3) investigate seasonal migration patterns of redband trout as they relate to stream temperature dynamics. We tagged 96 redband trout with radio transmitters and 706 with PIT tags. Radio tracking included both mobile and fixed station detections. We established PIT tag readers at Cato Bridge (Rkm 1), Busse Dam (Rkm 35), Grain Camp Dam (Rkm 48), and Page Dam (Rkm 76) for additional data on large-scale movement patterns. With the PIT antennas at the three diversion dams, we placed one antenna below the dam and one at the upstream exit of the fish ladders to evaluate the passage delays at each dam. Stream temperature was recorded at 10 locations in the Blitzen River throughout the study. Scales of 257 migratory trout were interpreted for age and spawning history. Our results indicated that the majority of Blitzen redband trout migrated upstream of Page Dam to spawn and that most trout spawned in the mainstem and not the tributaries. Upstream trout migration occurred from March to July, but the peak migration occurred during late April and early May. Passage problems were recorded at two of the three dams evaluated. Trout were delayed longest at Busse Dam and 44% of radio-tagged trout that approached the dam were never able to pass. Trout experienced less delay at Grain Camp Dam and only 8% of radio-tagged trout failed to pass the dam. At Page Dam, which has a recently upgraded fish ladder, trout delays were short and only 5% of trout that approached the dam were unable to pass. Potentially stressful or lethal temperatures (>24.3°C) were recorded at all monitoring locations downstream of Fish Creek, except at the site just below Page Springs. The migratory population ranged in age from 1+ to 5+, but only age 3+ and older trout were reproductively mature. This suggests that the spring upstream migration includes both adult trout seeking suitable spawning habitats and immature trout making a seasonal habitat shift for thermal refuge. A fraction of the PIT-tagged fish were observed to make two or three migrations from below Busse Dam to above Page Dam in the spring and returning back to the lower river in the fall. We recommend prioritizing fish passage at the Busse Dam and Grain Camp Dam for conservation and enhancement efforts. Close

• 17. [Article] Lake Billy Chinook - 1998 Length Frequency Estimates

  Abstract -- Reports length and frequency of bull trout, Kokanee, small mouth bass, Rainbow trout, and brown trout, that were caught in Lake Billy Chinook in 1998.

  Citation × Citation Citation Abstract Copy Title: Lake Billy Chinook - 1998 Length Frequency Estimates Abstract -- Reports length and frequency of bull trout, Kokanee, small mouth bass, Rainbow trout, and brown trout, that were caught in Lake Billy Chinook in 1998. Title: Lake Billy Chinook - 1998 Length Frequency Estimates Abstract -- Reports length and frequency of bull trout, Kokanee, small mouth bass, Rainbow trout, and brown trout, that were caught in Lake Billy Chinook in 1998. Close

• 18. [Article] 2017 Bull Trout Redd Monitoring in the Wallowa Mountains

  Abstract -- Bull trout were listed as threatened under the Endangered Species Act in 1998 due to declining populations. The U. S. Fish and Wildlife Service (Service) recommends monitoring bull trout in subbasins ...

  Citation × Citation Citation Abstract Copy Title: 2017 Bull Trout Redd Monitoring in the Wallowa Mountains Abstract -- Bull trout were listed as threatened under the Endangered Species Act in 1998 due to declining populations. The U. S. Fish and Wildlife Service (Service) recommends monitoring bull trout in subbasins where little is known about the populations, including the Grande Ronde and Imnaha subbasins. Spawning survey data is important for determining relative abundance and distribution trends in bull trout populations. This report summarizes the 2017 bull trout spawning data collected in the Wallowa Mountains of northeast Oregon and compares this with past years’ data. Bull trout spawning surveys have been conducted on similar index areas for selected Grande Ronde and Imnaha River streams from 1999 to 2017. These surveyed streams are located within the Wallowa River/Minam River and Imnaha River bull trout core areas. Surveys in 2017 were conducted by the Nez Perce Tribe (NPT), the Oregon Department of Fish and Wildlife (ODFW), the Service, U.S. Forest Service (USFS), Freshwater Trust, and fisheries consultants. Objectives of the survey included: (1) locate bull trout spawning areas; (2) determine redd characteristics; (3) determine bull trout timing of spawning; (4) collect spawning density data; (5) determine and compare the spatial distribution of redds along the Lostine River in 2006 through 2017; and (6) over time use all of the data to assess local bull trout population trends and the long-term recovery of bull trout. Timing of spawning, total redds, redd sizes, and redd locations are documented in the report. Title: 2017 Bull Trout Redd Monitoring in the Wallowa Mountains Abstract -- Bull trout were listed as threatened under the Endangered Species Act in 1998 due to declining populations. The U. S. Fish and Wildlife Service (Service) recommends monitoring bull trout in subbasins where little is known about the populations, including the Grande Ronde and Imnaha subbasins. Spawning survey data is important for determining relative abundance and distribution trends in bull trout populations. This report summarizes the 2017 bull trout spawning data collected in the Wallowa Mountains of northeast Oregon and compares this with past years’ data. Bull trout spawning surveys have been conducted on similar index areas for selected Grande Ronde and Imnaha River streams from 1999 to 2017. These surveyed streams are located within the Wallowa River/Minam River and Imnaha River bull trout core areas. Surveys in 2017 were conducted by the Nez Perce Tribe (NPT), the Oregon Department of Fish and Wildlife (ODFW), the Service, U.S. Forest Service (USFS), Freshwater Trust, and fisheries consultants. Objectives of the survey included: (1) locate bull trout spawning areas; (2) determine redd characteristics; (3) determine bull trout timing of spawning; (4) collect spawning density data; (5) determine and compare the spatial distribution of redds along the Lostine River in 2006 through 2017; and (6) over time use all of the data to assess local bull trout population trends and the long-term recovery of bull trout. Timing of spawning, total redds, redd sizes, and redd locations are documented in the report. Close

• 19. [Article] Rainbow Trout (Salmo gairdneri): Including Steelhead and Stream and Lake Forms

  Abstract -- Rainbow trout are native to the Pacific Coast drainages inland to the Rockies from the Rio del Presidio River in Mexico to the Kuskokwim River in Southwest Alaska (Behnke 1979). They are also ...

  Citation × Citation Citation Abstract Copy Title: Rainbow Trout (Salmo gairdneri): Including Steelhead and Stream and Lake Forms Abstract -- Rainbow trout are native to the Pacific Coast drainages inland to the Rockies from the Rio del Presidio River in Mexico to the Kuskokwim River in Southwest Alaska (Behnke 1979). They are also native to the Peace River drainage of British Columbia and the headwaters of the Athabaska River in Alberta (MacCrimmon 1971). Their present range extends from the Arctic Circle to 55° latitude; the only continent lacking rainbow trout is Antarctica (McAfee 1966, MacCrimmon 1971). Rainbow trout occur from O to 4,5OOM above sea level (MacCrimmon 1971) and, when their entire distribution range is considered, live in association with a large number of other species (McAfee 1966). Behnke (1979) recently proposed that rainbow and steelhead trout populations east of the Cascade range be considered as a separate species from coastal populations of rainbow and steelhead trout. Title: Rainbow Trout (Salmo gairdneri): Including Steelhead and Stream and Lake Forms Abstract -- Rainbow trout are native to the Pacific Coast drainages inland to the Rockies from the Rio del Presidio River in Mexico to the Kuskokwim River in Southwest Alaska (Behnke 1979). They are also native to the Peace River drainage of British Columbia and the headwaters of the Athabaska River in Alberta (MacCrimmon 1971). Their present range extends from the Arctic Circle to 55° latitude; the only continent lacking rainbow trout is Antarctica (McAfee 1966, MacCrimmon 1971). Rainbow trout occur from O to 4,5OOM above sea level (MacCrimmon 1971) and, when their entire distribution range is considered, live in association with a large number of other species (McAfee 1966). Behnke (1979) recently proposed that rainbow and steelhead trout populations east of the Cascade range be considered as a separate species from coastal populations of rainbow and steelhead trout. Close

• 20. [Article] Trout Mini-Management Plans

  Abstract -- A list of trout mini-management plans by reservoir, lake, creek or river for the years 1978-1986.

  Citation × Citation Citation Abstract Copy Title: Trout Mini-Management Plans Abstract -- A list of trout mini-management plans by reservoir, lake, creek or river for the years 1978-1986. Title: Trout Mini-Management Plans Abstract -- A list of trout mini-management plans by reservoir, lake, creek or river for the years 1978-1986. Close