scholarly journals Structured decision making for conservation of bull trout (Salvelinus confluentus) in Long Creek, Klamath River Basin, south-central Oregon

2017 ◽  
Author(s):  
Joseph R. Benjamin ◽  
Kevin McDonnell ◽  
Jason B. Dunham ◽  
William R. Brignon ◽  
James Peterson
Keyword(s):  
Decision Making ◽  
River Basin ◽  
Bull Trout ◽  
Salvelinus Confluentus ◽  
Structured Decision Making ◽  
Klamath River ◽  
South Central ◽  
Klamath River Basin

scholarly journals Thermal Regimes, Nonnative Trout, and Their Influences on Native Bull Trout in the Upper Klamath River Basin, Oregon

2016 ◽  
Vol 145 (6) ◽  
pp. 1318-1330 ◽  
Author(s):  
Joseph R. Benjamin ◽  
Jeannie M. Heltzel ◽  
Jason B. Dunham ◽  
Michael Heck ◽  
Nolan Banish
Keyword(s):  
River Basin ◽  
Bull Trout ◽  
Klamath River ◽  
Klamath River Basin ◽  
Thermal Regimes

scholarly journals Evaluating trade-offs in bull trout reintroduction strategies using structured decision making

2018 ◽  
Vol 75 (2) ◽  
pp. 293-307 ◽  
Author(s):  
William R. Brignon ◽  
James T. Peterson ◽  
Jason B. Dunham ◽  
Howard A. Schaller ◽  
Carl B. Schreck
Keyword(s):  
Decision Making ◽  
Decision Model ◽  
Sensitivity Analyses ◽  
Bull Trout ◽  
Salvelinus Confluentus ◽  
Ecological Processes ◽  
Structured Decision Making ◽  
Management Actions ◽  
Trade Offs ◽  
Donor Population

Structured decision making allows reintroduction decisions to be made despite uncertainty by linking reintroduction goals with alternative management actions through predictive models of ecological processes. We developed a decision model to evaluate the trade-offs between six bull trout (Salvelinus confluentus) reintroduction decisions with the goal of maximizing the number of adults in the recipient population without reducing the donor population to an unacceptable level. Sensitivity analyses suggested that the decision identity and outcome were most influenced by survival parameters that result in increased adult abundance in the recipient population, increased juvenile survival in the donor and recipient populations, adult fecundity rates, and sex ratio. The decision was least sensitive to survival parameters associated with the captive-reared population, the effect of naivety on released individuals, and juvenile carrying capacity of the reintroduced population. The model and sensitivity analyses can serve as the foundation for formal adaptive management and improved effectiveness, efficiency, and transparency of bull trout reintroduction decisions.

scholarly journals Electrofishing, Snorkel Spearing, and Piscicide Eradicate Brook Trout From a Small, Isolated Bull Trout Population

2019 ◽  
Vol 10 (1) ◽  
pp. 219-227 ◽  
Author(s):  
Nolan P. Banish ◽  
William R. Tinniswood ◽  
Terry A. Smith
Keyword(s):  
River Basin ◽  
Brook Trout ◽  
Cost Effective ◽  
Habitat Characteristics ◽  
Lower Percentage ◽  
Bull Trout ◽  
Similar Treatment ◽  
Treatment Length ◽  
Klamath River ◽  
Klamath River Basin

Abstract In 1992, a sampling crew from a multiagency group discovered a population of Bull Trout Salvelinus confluentus estimated at approximately 50 individuals in Threemile Creek, Oregon threatened with competition and hybridization with nonnative Brook Trout Salvelinus fontinalis. The group implemented Brook Trout and Bull Trout × Brook Trout hybrid removal using multiple techniques to conserve this population of Bull Trout in the Klamath River basin. From 1996 to 2000, backpack electrofishing and night snorkel spearing were used upstream of a culvert barrier to eradicate Brook Trout and hybrid trout from a 3.59-km section of Threemile Creek over 101 total days of effort (274 person-days of effort). Night snorkel spearing removed a lower percentage (7%) of target fish relative to electrofishing (93%), although this technique eliminated the risk of electrofishing injury to Bull Trout. Concurrent with the reduction and subsequent removal of Brook Trout, Bull Trout observations increased over 15-fold from 19 in 1996 to 299 in 2012 and Bull Trout distribution more than doubled, from 1.48 to 3.43 km during that same time. Immediately downstream in a separate 2.3-km section, the group eradicated Brook Trout using backpack electrofishing and rotenone application upstream of two man-made barriers from 2004 to 2010 over 43 total days of effort (150 person-days of effort). By 2016, Bull Trout had expanded their distribution throughout the upper 3.59-km section of Threemile Creek. Effort expended to eradicate Brook Trout was similar to successful eradication in other streams with comparable habitat characteristics and similar treatment length (< 3.0 km). However, similar removal attempts have not been successful in streams with comparable habitat characteristics that had longer treatment length (> 7.0 km). Application of piscicide may be more cost effective than manual techniques to remove Brook Trout when there is no risk to native fish of conservation concern, where target species are allopatric, and when piscicide use is publicly accepted. Brook Trout eradication proved valuable in providing Bull Trout the opportunity for range expansion and increased abundance necessary for recovery in the Klamath River basin.

Considerations for the Propagation and Conservation of Endangered Lake Suckers of the Western United States

2017 ◽  
Vol 8 (1) ◽  
pp. 301-312 ◽  
Author(s):  
Julie L. Day ◽  
Jennifer L. Jacobs ◽  
Josh Rasmussen
Keyword(s):  
United States ◽  
River Basin ◽  
Freshwater Fishes ◽  
Western United States ◽  
Numerous Species ◽  
Klamath River ◽  
Western Lake ◽  
Prevention Measure ◽  
Klamath River Basin ◽  
Anthropogenic Threats

Abstract Decades of persistent natural and anthropogenic threats coupled with competing water needs have compromised numerous species of freshwater fishes, many of which are now artificially propagated in hatcheries. Low survival upon release is common, particularly in systems with substantial nonnative predator populations. Extensive sampling for Shortnose (Chasmistes brevirostris) and Lost River Suckers (Deltistes luxatus) in the Klamath River Basin on the California–Oregon border have failed to detect any new adult recruitment for at least two decades, prompting an investigation into artificial propagation as an extinction prevention measure. A comprehensive assessment of strategies and successes associated with propagation for conservation restocking has not been performed for any Catostomid. Here, we review available literature for all western lake sucker species to inform propagation and recovery efforts for Klamath suckers and summarize the relevance of these considerations to other endangered fishes.

Institutional networks and adaptive water governance in the Klamath River Basin, USA

2016 ◽  
Vol 57 ◽  
pp. 112-121 ◽  
Author(s):  
B.C. Chaffin ◽  
A.S. Garmestani ◽  
H. Gosnell ◽  
R.K. Craig
Keyword(s):  
River Basin ◽  
Water Governance ◽  
Klamath River ◽  
Klamath River Basin
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