Download or read book Feeding Habits of Trout in Five Tributaries to the Pend Oreille River written by Loreley Clark and published by . This book was released on 1991 with total page 636 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The purpose of this study was to investigate the feeding habits of trout in five tributaries of the Pend Oreille River in 1989. Brook trout (Salvelinus tontina/is), brown trout (Salmo trutta), cutthroat trout (Oncorhynchus clarki) and rainbow trout (Oncorhynchus mykiss) were collected from LeClerc Creek, Ruby Creek, Gee Gee Ah Creek, Tacoma Creek and Skookum Creek. The study objectives were to to determine: (1) the important food items of trout in the tributaries; (2) whether trout were selecting prey in relation to abundance; and (3) whether the potential for competition existed for preferred food items which could have limited trout production. Stomachs from trout ranging from age 0 to age IV were removed for content analysis. The top benthic contributors to trout diets were Limnephilidae, Brachycentridae, Chironomidae larvae and Baetidae as determined by an index of relative importance. Approximately 75 percent of the trout diet was came from the aquatic environment and the remaining 25 percent from the terrestrial environment. Juvenile trout consumed the same organisms as the adults but in different proportions. The mean number of Limnephilidae consumed increased with increasing age of the trout. Electivity values for the combined age classes showed that trout were consuming prey in the general proportions found in both the drift and the benthos. Limnephilidae generally had the highest electivity value for the combined age classes of trout. Diet overlaps were high between brook trout and brown trout. Cutthroat trout diets overlaps were low to moderate with both brook trout and brown trout suggesting that some partitioning of food resources was occurring. Competition for food resources was believed to have been one possible mechanism for the distribution and size of populations of the different trout species in the tributaries. Geographic distribution, population estimates, diet overlaps, low invertebrate densities and trout growth provide some indication that the five tributaries may be food limited"--Document.

Download or read book 1994 Columbia River Basin Fish and Wildlife Program written by Northwest Power Planning Council (U.S.) and published by . This book was released on 1994 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Master s Theses Directories written by and published by . This book was released on 1992 with total page 688 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Movements of Bull Trout Salvelinus Confluentus Above and Below Albeni Falls Dam written by Mark Paluch and published by . This book was released on 2011 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Dams built without a means of fish passage such as Albeni Falls Dam, constructed on the Pend Oreille River, ID in 1955, block fish migration to their natal tributary. The first set of objectives for this study were: to provide bull trout (Salvelinus conjluentus) passage around Albeni Falls Dam, predict natal tributary from genetic samples, and track the movements of the tagged fish to determine if the tributary entered during for spawning period matched the genetically predicted natal tributary for each fish. Eight bull trout were captured below Albeni Falls Dam. Each fish was surgically implanted with a transmitter and released above the dam. Genetic samples from each fish were compared with databases of known bull trout populations located between Albeni Falls Dam and Thompson Falls Dam, MT to determine the most probable natal tributary of each fish. Movements were monitored using radio and acoustic telemetry via twelve fixed receiver stations (four at Albeni Falls Dam, one on the Priest River, two near the Dover railroad tracks leading into Lake Pend Oreille, one on the Pack River, and one on each of the major bull trout producing tributaries of Lake Pend Oreille: Lightning, Trestle, Gold, and Granite creeks) and mobile tracking via vehicle, boat and aircraft. Seven of the eight tagged bull trout migrated past the receiver stations leading into Lake Pend Oreille and one fish traveled up the Priest River. Five of the fish transmitters were detected in the predicted natal tributary. Of the three tags not detected in the predicted natal tributaries; one fish was located in Lake Pend Oreille, one fish has not been located since entering the lake, and one fish was last detected in the Priest River. Preliminary results indicate most bull trout that are provided passage upstream of Albeni Falls Dam attempt to return to upstream tributaries to spawn. These tributaries are most likely their natal tributaries. Providing passage upstream of Albeni Falls Dam reduces losses to populations and protects genetic integrity of native bull trout in the Pend Oreille Basin. The second set of objectives for this study were to: analyze spatial and temporal distributions along the downstream face of Albeni Falls Dam, analyze the relationship between fish behavior and operating conditions of dam, and track movements downstream from the dam. Twelve bull trout and seventeen westslope cutthroat trout (Oncorhynchus clarki) were tagged and released below Albeni Falls Dam. When released below Albeni Falls Dam, bull trout tended to approach the dam before exploring downstream. They generally stayed within a short distance of the dam until water temperature began to rise. Distances of downstream travel increased as temperatures increased. These increased distances traveled downstream were probably made in search of cold. Six bull trout were found downstream of Albeni Falls Dam in areas where cooler water enters the Pend Oreille River. These provided cold water refuge for bull trout when the Pend Oreille River water temperature rose above the bull trout's thermal zone of tolerance (16°C). The existence of cold water refuge downstream from Albeni Falls Dam allows for the potential re-establishing bull trout populations in the Pend Oreille River. Data was collected in two macro and four micro zones on seven of the bull trout and fifteen of the westslope cutthroat trout. Movements were detected on both sides of the powerhouse and tailrace spillways, where potential sites for establishing permanent fish passage have been identified. Albeni Falls Dam has three turbines. No combination of flow through these turbines was found that excluded bull trout or westslope cutthroat trout from moving throughout the entire powerhouse tailrace. Data collected below Albeni Falls Dam indicates a preference for the powerhouse tailrace by bull trout"--Document.

Download or read book Resident Fish and Wildlife Amendments to the Columbia River Basin Fish and Wildlife Program phase 4 written by and published by . This book was released on 1993 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Inland Fishes of California written by Peter B. Moyle and published by Univ of California Press. This book was released on 2002-05-21 with total page 533 pages. Available in PDF, EPUB and Kindle. Book excerpt: When the first edition of Inland Fishes of California was published in 1976, it was a benchmark reference. Since that time, our knowledge of California's freshwater fishes has dramatically increased. This completely revised edition incorporates a vast amount of new information and creates a fresh synthesis of the historical data. Written by the leading expert on California's freshwater fishes and illustrated with beautiful line drawings, this compendium is the single best source for understanding and identifying the state's freshwater fishes. It is an essential resource for anyone who needs to have accurate and detailed information on California's fishes at their fingertips. Since the 1870s, the state's native fishes have been joined by thirty-four alien species, which now dominate many bodies of water. This book treats both native and introduced species, first in a key for identification, and then in individual species accounts covering characteristics, taxonomy, names, distribution, and life history. Each account includes the author's personal assessment of how well the species is doing and problems associated with its management. Most of the native fishes are found only in California and show many wonderful adaptations for living in the state's diverse waters. Unfortunately, many are also in danger of extinction. The message underlying the first edition of this book was that we knew astonishingly little about many of California's inland fishes. Although our knowledge is increasing, full accounts of some native fishes may not be complete before they become extinct. Preventing the loss of native fishes is the major goal of this book, and Moyle makes important suggestions for conservation strategies as well as presenting up-to-date information on ecology, life history, and distribution. With this knowledge, preserving our native fishes becomes possible even in the face of the state's growing economy and population.

Download or read book Federal Energy Regulatory Commission Reports written by United States. Federal Energy Regulatory Commission and published by . This book was released on 1999 with total page 1814 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Energy Research Abstracts written by and published by . This book was released on 1990 with total page 1018 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semiannual, with semiannual and annual indexes. References to all scientific and technical literature coming from DOE, its laboratories, energy centers, and contractors. Includes all works deriving from DOE, other related government-sponsored information, and foreign nonnuclear information. Arranged under 39 categories, e.g., Biomedical sciences, basic studies; Biomedical sciences, applied studies; Health and safety; and Fusion energy. Entry gives bibliographical information and abstract. Corporate, author, subject, report number indexes.

Download or read book Fishery Leaflet written by and published by . This book was released on 1946 with total page 634 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government Reports Announcements Index written by and published by . This book was released on 1991-08 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Federal Register written by and published by . This book was released on 1999-11 with total page 896 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Charrs written by E.K. Balon and published by Springer. This book was released on 1980-04-30 with total page 948 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Current References in Fish Research written by and published by . This book was released on 1995 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Research and Development Report written by United States. Bonneville Power Administration and published by . This book was released on 1989 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Trout written by Ernest George Schwiebert and published by Dutton Adult. This book was released on 1984 with total page 1010 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Idaho Wildlife Review written by and published by . This book was released on 1959 with total page 1050 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Research and Development Report Fiscal Years written by United States. Bonneville Power Administration and published by . This book was released on 1987 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: