Download or read book A Population Study of the Rainbow Trout Salmo Gairdneri in a Central Oregon Stream written by Charles Edwin Osborn and published by . This book was released on 1968 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: The rainbow trout population in Elder Creek, Oregon was studied between June 1965 and November 1966. The physical characteristics of the stream during the summer season were described. Rainbow trout were captured in each of three sections on the stream by electrofishing and were tagged and measured. Population size, mortality, recruitment, growth rate, and production was estimated for fish in each section where data were sufficient. Estimates were made of the yield of trout to the sport fishery. The water in Elder Creek is relatively low in concentration of dissolved solids. The stream lies in a canyon of mostly bedrock and large cobbles with very little spawning gravel. Water temperature was found to be near the maximum for trout suitability in the lower reaches of the stream. Reliable estimates of population size and their variation were obtained within the summer of 1966. Population size estimates for the summer of 1965 were not reliable because of the small numbers of trout that could be obtained during this period. Therefore estimates of annual rates of mortality, growth, and production were not possible, Growth rates were estimated for marked and for unmarked fish during the summer of 1966. Marked fish were found to have a markedly lower growth than unmarked fish. Of 755 observations of trout movement during the study less than four percent were found to have moved more than 300 feet. Immigration of adult fish into the population was either insignificant or not detectable. Although Elder Creek has a good population of legal-sized native trout, fishing pressure on the stream is relatively light. The lower reaches are fished more heavily than the headwaters, which probably receive no angling pressure during some fishing seasons.

Download or read book Correlations Between Rainbow Trout Salmo Gairdneri Populations and Stream Environments in Eastern Oregon Streams written by Terry Neill Grimes and published by . This book was released on 1980 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Theses and Dissertations 1966 1970 Oregon State University written by Margaret Basilia Guss and published by . This book was released on 1973 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Theses and Dissertations Oregon State University written by and published by . This book was released on 1973 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1991 with total page 806 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Progressive Fish Culturist written by U.S. Fish and Wildlife Service and published by . This book was released on 1980 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bibliographic Series written by and published by . This book was released on 1973 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Progressive Fish culturist written by and published by . This book was released on 1980 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Draft Environmental Impact Statement for Managing Western Spruce Budworm in Oregon and Washington written by and published by . This book was released on 1988 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Sport Fishery Abstracts written by and published by . This book was released on 1980 with total page 814 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Upstream written by National Research Council and published by National Academies Press. This book was released on 1996-08-17 with total page 473 pages. Available in PDF, EPUB and Kindle. Book excerpt: The importance of salmon to the Pacific Northwestâ€"economic, recreational, symbolicâ€"is enormous. Generations ago, salmon were abundant from central California through Idaho, Oregon, and Washington to British Columbia and Alaska. Now they have disappeared from about 40 percent of their historical range. The decline in salmon numbers has been lamented for at least 100 years, but the issue has become more widespread and acute recently. The Endangered Species Act has been invoked, federal laws have been passed, and lawsuits have been filed. More than $1 billion has been spent to improve salmon runsâ€"and still the populations decline. In this new volume a committee with diverse expertise explores the complications and conflicts surrounding the salmon problemâ€"starting with available data on the status of salmon populations and an illustrative case study from Washington state's Willapa Bay. The book offers specific recommendations for salmon rehabilitation that take into account the key role played by genetic variability in salmon survival and the urgent need for habitat protection and management of fishing. The committee presents a comprehensive discussion of the salmon problem, with a wealth of informative graphs and charts and the right amount of historical perspective to clarify today's issues, including: Salmon biology and geographyâ€"their life's journey from fresh waters to the sea and back again to spawn, and their interaction with ecosystems along the way. The impacts of human activitiesâ€"grazing, damming, timber, agriculture, and population and economic growth. Included is a case study of Washington state's Elwha River dam removal project. Values, attitudes, and the conflicting desires for short-term economic gain and long-term environmental health. The committee traces the roots of the salmon problem to the extractive philosophy characterizing management of land and water in the West. The impact of hatcheries, which were introduced to build fish stocks but which have actually harmed the genetic variability that wild stocks need to survive. This book offers something for everyone with an interest in the salmon issueâ€"policymakers and regulators in the United States and Canada; environmental scientists; environmental advocates; natural resource managers; commercial, tribal, and recreational fishers; and concerned residents of the Pacific Northwest.

Download or read book A Study of the Rainbow Trout Salmo Gairdneri Richardson in Howard Creek Oconee County South Carolina written by John S. Garton and published by . This book was released on 1976 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Ecological Characterization of the Central and Northern California Coastal Region pt 1 Regional characterization pt 2 Species written by and published by . This book was released on 1981 with total page 690 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Umatilla National Forest N F Invasive Plants Treatment Project written by and published by . This book was released on 2010 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Payette National Forest N F Middle Fork Weiser River Watershed Project written by and published by . This book was released on 2001 with total page 686 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fishery Bulletin written by and published by . This book was released on 1980 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1989 with total page 1310 pages. Available in PDF, EPUB and Kindle. Book excerpt: