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Showing 1 to 18 of 18 for “"rainbow smelt"”.
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Entrainment of Rainbow Smelt Through Oahe Dam, South Dakota
… almost entirely by a single prey species, rainbow smelt Osmerus mordax. Population size of rainbow smelt has been variable, confounding management decisions that require an understanding of prey availability. Biologists are aware that rainbow smelt and other fishes pass through Oahe Dam; …
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Behavioral Responses of Rainbow Smelt to Sensory Deterrent Systems
Since the late 1970s, rainbow smelt Osmerus mordax have been the primary prey fish for top-level predators in Lake Oahe. Historically, water level management and entrainment losses of rainbow smelt at the Lake Oahe dam have likely contributed to the reduced growth rate of walleye Sander vitreus, …
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Factors Influencing Rainbow Smelt Entrainment Through Oahe Dam, South Dakota
… of the dynamics surrounding the entrainment of rainbow smelt through Oahe Dam. Rainbow smelt are an important forage species for walleye and salmonids in Lake Oahe. Loss of rainbow smelt, from Lake Oahe through turbine entrainment could, if of sufficient magnitude, exacerbate variability in …
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Bioenergetics and Life History of Rainbow Smelt in Lake Oahe, South Dakota
Lake Oahe was formed by closure of Oahe Dam on the Missouri River by the U.S. Army Corp of Engineers in August, 1958. The reservoir reached full pool in December of 1967 and extends from Pierre located in North-central South Dakota into the southern third of North Dakota near Bismarck (June 1974). …
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Influence of Rainbow Smelt Predation on Zooplankton Community Composition in Lake Oahe, South Dakota
Rainbow smelt Osmerus mordax were introduced into Lake Oahe, South Dakota, in the 1970's. I studied rainbow smelt and zooplankton interactions in Lake Oahe during 1990 to evaluate the influence of rainbow smelt predation on the zooplankton community. Zooplankton composition and abundance and the …
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Evaluating the effects of rainbow smelt on native piscivores in freshwater systems with a special focus on walleye recruitment and larval bioenergetics
Since the early 1900's rainbow smelt (Osmerus mordax)have been introduced into many new freshwater inland systems outside of its native range. In freshwater systems the interaction between rainbow smelt and native piscivores differs from species to species. In some cases predation or competitive …
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Life History and Bioenergetics of Chinook Salmon in Lake Oahe, South Dakota
… were first stocked, but then changed to age-0 rainbow smelt Osmerus mordax within two months. Age-I chinook salmon relied on both age-0 and adult rainbow smelt as their primary prey; age-0 smelt contributed little to the diet of older salmon. Age-3 chinook salmon consumed only adult rainbow …
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Bioenergetics of Rainbow Trout in Lake Oahe, South Dakota
Rainbow trout Oncorhynchus mykiss have been stocked in Lake Oahe, South Dakota for the past 25 years. In recent years spawning runs of rainbow trout have increased, providing South Dakota Department of Game, Fish and Parks biologist the opportunity to substantially increase stocking rates. Concern …
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Bioenergetics of Walleye in Lake Oahe, South Dakota
… temperatures allowed a cold-water prey fish, rainbow smelt Osmerus mordax, to occupy most of the water column throughout Oahe Reservoir in 1993. The fluctuating water levels and water temperatures have also had an influence on the food habits of walleyes. The relative importance (RI) index was …
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Food Habits of Walleyes in Lake Oahe, South Dakota
… were initially the most important prey fish, but rainbow smelt became important as walleyes moved from the littoral zone of the bay to open water. Macroinvertebrates were not a substantial portion of the diet of YOY walleyes. The only macroinvertebrates found in walleye stomachs were ephemerids …
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Food Habits of Walleye and Sauger in Lake Sakakawea, North Dakota
… evaluated using the relative importance index. Rainbow smelt Osmerus mordax were the most important prey throughout the reservoir; however, seasonal importance of rainbow smelt varied among sites. Rainbow smelt importance decreased from the lower to upper end of the reservoir. Percid diets …
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Estimating Trophic Position of Lake Oahe Walleye Using Stable Isotope Analysis
Variable rainbow smelt Osmerus mordax recruitment has important implications for walleye Sander vitreus growth and condition in Lake Oahe, South Dakota. In recent years, the rainbow smelt population has decreased appreciably in Lake Oahe. This decline, combined with strong (successive) year classes …
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LARVAL FISH EXPORT IN RESPONSE TO VARYING COMPENSATING GATE DISCHARGE AT THE SAULT RAPIDS, ST. MARYS RIVER
… from the rapids. During my study, larval rainbow smelt (<em>Osmerus mordax</em>) densities were best explained by water temperature, discharge, and year of sampling while non-smelt densities were best explained by year of sampling and water temperature. Using a Bayesian state-space model, …
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Productivity and Trophic Interactions in the Missouri River Impoundments
… in Lake Oahe, for example, provides refuge for rainbow smelt Osmorus mordax --- a forage species that contributes significantly to walleye Sander vitreus production. In contrast, prey fish populations in downstream impoundments are dominated by gizzard shad Dorosoma cepedianum, cyprinids, and …
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Food Habits and Distribution of the Emerald Shiner, Notropis atherinoides Rafinesque, and the Spottail Shiner, Notropis hudsonius (Clinton), in Lake Oahe, South Dakota
… in Lake Oahe in habitats where the primary prey, rainbow smelt Osmerus mordax is scarce or absent.</p>
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Exploring Interactions Between Walleye and Smallmouth Bass in South Dakota Waters
… (specifically, the absence of gizzard shad and rainbow smelt Osmerus mordax) and increased water temperatures (as projected from global climate change models) on walleye and smallmouth bass growth. Scenarios indicated the absence of rainbow smelt from upper Lake Sharpe walleye diets reduced …
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Strobe Light Effects On Stress and Avoidance Behavior in Fishes and Distribution of Zooplankton in Lake Oahe, South Dakota
… with the phototactic avoidance of lights by rainbow smelt, may help reduce fish attraction to strobe lights. To my knowledge, this was the first study to show that strobe lights influence pelagic zooplankton distribution.
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Foraging ecology and parental care of common terns (Sterna hirundo) nesting in Windermere Basin, Lake Ontario
… most commonly delivered to chicks by adults were rainbow smelt (Osmerus mordax) and alewife (A/osa pseudoharengus), followed in importance by larval fish, emerald shiner (Notropis antherinoides), salmonids, and fathead minnows (Pimepha/es prome/as). The relative proportions of various fish speCies …