Kootenai River Fisheries Investigations; Rainbow and Bull Trout Recruitment, 1999 Annual Report.

Walters, Jody P.; Downs, Christopher C

doi:10.2172/789590

Cited by 3 publications

(21 citation statements)

References 5 publications

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“…Bull trout redd surveys were conducted along index transects on Boulder Creek and North and South Callahan creeks (Walters 2004b). Each index transect was hiked once during midday.…”

Section: Bull Trout Redd Surveysmentioning

confidence: 99%

“…The bull trout Salvelinus confluentus, another sport fish native to the Kootenai River, was listed as threatened under the Endangered Species Act (ESA) in 1998. Bull trout are distributed throughout the Kootenai River mainstem and some tributaries downstream of migration barriers in Idaho (Partridge 1983;Paragamian , 1995aDowns 1999Downs , 2000Walters and Downs 2001;. Little is known about population numbers, but juvenile bull trout densities ranged from 1.64/100 m 2 to 7.65/100 m 2 across four sample reaches in the Callahan Creek drainage in 2003 (Walters 2004b).…”

Section: Introductionmentioning

confidence: 99%

“…Callahan creeks in 2002 (Walters , 2004a. Annual bull trout redd counts have continued on Boulder Creek since 2000 and in the Callahan Creek drainage since 2003 (Walters 2004b.…”

Section: Introductionmentioning

confidence: 99%

“…Annual bull trout redd counts have continued on Boulder Creek since 2000 and in the Callahan Creek drainage since 2003 (Walters 2004b. The bull trout draft recovery plan states that the trend criteria for recovery will be met when the bull trout population is accepted as stable or increasing based on at least 10 years of monitoring data (U.S. Fish and Wildlife Service 2002).…”

Section: Introductionmentioning

confidence: 99%

“…A nutrient restoration experiment is currently underway to test the nutrient limitation hypothesis (IDFG and Kootenai Tribe of Idaho, unpublished data). Another possible factor limiting the Kootenai River redband trout population is angling exploitation (Walters and Downs 2001;. A 406 mm (16") minimum length limit and 2-fish bag limit were initiated on hybridization is increasing and that hybrid swarms are likely to develop .…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Kootenai River Fisheries Investigations: Salmonid Studies Project Progress Report, 2007-2008 Annual Report.

Paragamian¹,

Walters²,

Maiolie³

2009

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“…Bull trout redd surveys were conducted along index transects on Boulder Creek and North and South Callahan creeks (Walters 2004b). Each index transect was hiked once during midday.…”

Section: Bull Trout Redd Surveysmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Callahan creeks in 2002 (Walters , 2004a. Annual bull trout redd counts have continued on Boulder Creek since 2000 and in the Callahan Creek drainage since 2003 (Walters 2004b.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Kootenai River Fisheries Investigations: Salmonid Studies Project Progress Report, 2007-2008 Annual Report.

Paragamian¹,

Walters²,

Maiolie³

2009

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Nutrient Restoration of a Large, Impounded, Ultra‐Oligotrophic Western River to Recover Declining Native Fishes

Hardy

Ross

McDonnell

et al. 2022

N American J Fish Manag

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Declines in many fish populations in large, western rivers have been primarily attributed to the anthropogenic reduction of nutrient inputs and subsequent impacts to the food web. The largest known river fertilization program was implemented starting in 2005 on the Kootenai River in northern Idaho to restore resident fisheries. Annual electrofishing surveys were conducted at multiple sites in Idaho and Montana before and during nutrient addition to evaluate assemblage and population‐level responses. Although few responses in fish assemblage structure were observed, the addition of liquid ammonium polyphosphate fertilizer (3 μg/L) to the Kootenai River increased fish abundance and biomass over the 20‐km stretch of river downstream of the treatment site. Increases were most notable in Largescale Suckers Catostomus macrocheilus, Mountain Whitefish Prosopium williamsoni, and Rainbow Trout Oncorhynchus mykiss populations, although increases in catch and biomass were detected for nearly all fish species. The Kootenai River is approximately 30 times larger in discharge than other rivers that have been experimentally fertilized and provides compelling evidence that the mitigation of nutrient declines in rivers of similar size can result in positive influences on the fish populations where primary and secondary production are limiting growth, survival, and recruitment. However, results from our study also highlight the importance of completing evaluations across varying levels of biological organization (e.g., assemblage and population) and over biologically relevant timeframes.

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Kootenai River Fisheries Investigations; Rainbow and Bull Trout Recruitment, 2002-2003 Annual Report.

Walters¹

2004

Self Cite

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Rainbow trout Oncorhynchus mykiss provide the most important sport fishery in the Kootenai River, Idaho, but densities and catch rates are low. Low recruitment is one possible factor limiting the rainbow trout population. Bull trout Salvelinus confluentus also exist in the Kootenai River, but little is known about this population. Research reported here addresses the following objectives for the Kootenai River, Idaho: increase rainbow trout recruitment, identify rainbow and bull trout spawning tributaries and migration timing, establish baseline data on bull trout redd numbers in tributaries, and improve the rainbow trout population size structure. Six adult rainbow trout were moved to spawning habitat upstream of a potential migration barrier on Caboose Creek, but numbers of redds and age-0 out-migrants did not appear to increase relative to a reference stream. Measurements taken on the Moyie River indicated the gradient is inadequate to deliver suitable flows to a proposed rainbow trout spawning channel. Summer water temperatures measured in the Deep Creek drainage sometimes exceeded 24°C, higher than those reported as suitable for rainbow trout. Radio-tagged rainbow trout were located in Boulder Creek during the spring spawning season, and bull trout were located in the Moyie River and O'Brien Creek, Montana in the fall. Bull trout spawning migration timing was related to increases in Kootenai River flows. Bull trout redd surveys documented 19 redds on Boulder Creek and North and South Callahan creeks. Fall 2002 electrofishing showed that the Kootenai River rainbow trout proportional stock density was 54, higher than prior years when more liberal fishing regulations were in effect. Boulder Creek produces the highest number of age-0 rainbow trout out-migrants upstream of Bonners Ferry, but the survival rate of these out-migrants upon reaching the Kootenai River is unknown. Determining juvenile survival rates and sources of mortality could aid management efforts to increase rainbow trout recruitment. North and South Callahan creeks support the largest spawning population of bull trout in the Kootenai River drainage, Idaho, so management of the watershed should consider bull trout as high priority.

show abstract

Kootenai River Fisheries Investigations; Rainbow and Bull Trout Recruitment, 1999 Annual Report.

Cited by 3 publications

References 5 publications

Kootenai River Fisheries Investigations: Salmonid Studies Project Progress Report, 2007-2008 Annual Report.

Kootenai River Fisheries Investigations: Salmonid Studies Project Progress Report, 2007-2008 Annual Report.

Nutrient Restoration of a Large, Impounded, Ultra‐Oligotrophic Western River to Recover Declining Native Fishes

Kootenai River Fisheries Investigations; Rainbow and Bull Trout Recruitment, 2002-2003 Annual Report.

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