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Item Attraction, entrance, and passage efficiency of arctic grayling, trout, and suckers at Denil fishways in the Big Hole River Basin, Montana(Montana State University - Bozeman, College of Letters & Science, 2020) Triano, Benjamin Louis; Chairperson, Graduate Committee: Thomas E. McMahonThe Big Hole River in southwest Montana supports the only indigenous, self-sustaining fluvial population of Arctic Grayling (Thymallus arcticus) in the conterminous United States. Denil fishways have been installed at 63 low-head irrigation diversion dams throughout the basin to provide grayling and other fishes year-round access to critical habitats; however, their efficiency has not been evaluated comprehensively. We quantified attraction, entrance, and passage efficiency of grayling, trout (Brook Trout Salvelinus fontinalis and Brown Trout Salmo trutta), and suckers (White Sucker Catostomus commersonii and Longnose Sucker C. catostomus) at six Denil fishways during 14 trials conducted over a range of fishway slopes and hydraulic conditions. Tagged hatchery-reared grayling and wild fish of several taxa were released downstream of diversions in each trial, and upstream passage was monitored for 72 hours using passive integrated transponder telemetry. Attraction (60.4-84.3%) and entrance (44.3-78.6%) efficiencies limited overall fishway efficiencies (19.1-55.8%), but passage efficiencies (96.2-97.0%) were high for all taxa over all conditions tested. Attraction of hatchery-reared grayling was limited at fishways with shallow upstream depths (low fishway discharges) and low attraction flows, but wild trout and suckers were less limited by these effects. Entrance of grayling and trout was limited at high fishway discharges and fishways with steep slopes, but both species groups were more likely to enter fishways with deep downstream depths than those with shallow downstream depths. Entrance appeared to be limited by turbulent plunging conditions associated with shallow downstream depths. Denil fishways demonstrated great promise for improving habitat connectivity for grayling and other fishes in the Big Hole River basin; however, attraction and entrance were key bottlenecks that limited overall fishway efficiency. Maintaining high attraction flows and deep downstream depths should be the focus of adaptive management strategies and design criteria to improve overall efficiency of Denil fishways in the Big Hole basin.Item The effects of metals on trout populations in the Upper Boulder River, Montana(Montana State University - Bozeman, College of Letters & Science, 1976) Nelson, Frederick A.Item The food of rainbow trout, brown trout and brook trout fry and fingerlings from five southwestern Montana streams(Montana State University - Bozeman, College of Letters & Science, 1960) Fry, James P.Item Size, abundance, and seasonal habitat utilization of an unfished trout population and their response to catch and release fishing(Montana State University - Bozeman, College of Letters & Science, 1993) Vore, Denise WilsonItem A trout population study on a small creek in Gallatin County, Montana(Montana State University - Bozeman, College of Letters & Science, 1952) Holton, George D.Item The effects of channelization and mitigation on the morphology and trout populations of the St. Regis River, Montana(Montana State University - Bozeman, College of Letters & Science, 1976) Schaplow, Barry MiltonItem Physical factors influencing fish populations in pools of a trout stream(Montana State University - Bozeman, College of Letters & Science, 1967) Lewis, Stephen LawrenceItem Changes in the trout population of a small Montana stream(Montana State University - Bozeman, College of Letters & Science, 1963) Wipperman, Alfred HenryItem Abundance and movement of young trout in a portion of the Madison River, Montana(Montana State University - Bozeman, College of Letters & Science, 1968) Sundeen, Donald RoyItem Trout mortality, movements, and habitat selection during winter in South Willow Creek, Montana(Montana State University - Bozeman, College of Letters & Science, 1989) Schrader, William C.