Download or read book The Influence of Channel Morphology and Hydrology on Spawning Populations of Steelhead Trout in South Fork Eel River Tributaries written by William Joseph Trush and published by . This book was released on 1991 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fluv Geom Geom Crit Conc Vol written by Olav Slaytnaker and published by Routledge. This book was released on 2013-08-21 with total page 563 pages. Available in PDF, EPUB and Kindle. Book excerpt: First Published in 2004.
Download or read book Fisheries Review written by and published by . This book was released on 1992 with total page 606 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fish Bypass Flows for Coastal Watersheds written by Peter B. Moyle and published by . This book was released on 2000 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Form and Process in Channel Incision of Bedrock written by Michele Ann Seidl and published by . This book was released on 1993 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Biophysical Factors Driving the Distribution and Abundance of Redband steelhead Trout Oncorhynchus Mykiss Gairdneri in the South Fork John Day River Basin Oregon USA written by Luis Francisco Madriñán and published by . This book was released on 2008 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: The overall goal of this study was to identify multiple scales of habitat use and habitat electivity by redband/steelhead trout and define the limiting factors affecting the distribution patterns of this species during summer flows. The main objective in chapter 2 was to identify the most important habitat associations that control the distribution patterns of threatened populations of redband/steelhead trout in the South Fork John Day River Basin. I found that the factors influencing the distribution patterns of trout in the basin were dependent on the thermal context and spatial extent of analysis. The inclusion of water temperature alone at large spatial scales explained most of the distribution of trout at the basin scale and that channel morphology was a very important factor at small spatial scales. The main objective in chapter 3 was to identify geophysical factors influencing the distribution pattern of threatened populations of redband/steelhead trout in the basin at multiple spatial scales. I found that the trout distribution patterns in the area could be described as a clustered distribution, with a strong selection for upstream-cold water reaches and small, well oxygenated, running water pools. My study reveals that the most influential factor at large spatial scales was water temperature and smaller scale channel morphology. Chapter 4 examines whether longitudinal-summer-stream temperature profiles in semi arid-environment streams can be used to index carrying capacities of threatened populations of redband/steelhead trout. My results show that, in the South Fork John Day Basin, stream temperature can be used as indicator of trout carrying capacity. The distribution redband/steelhead trout in summer is largely determined by the- physiologically influenced-preference that individuals have for habitats within specific temperature ranges.
Download or read book Subpopulation Structure of Steelhead Trout Oncorhynchus Mykiss in the Middle Fork Eel River as Determined by Microsatellite DNA Polymorphisms written by Anthony J. Clemento and published by . This book was released on 2006 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genetic Variation of Steelhead Trout Salmo Gairdneri Richardson Populations in the South Fork Trinity River California written by Bruce M. Baker and published by . This book was released on 1988 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Channel Morphology Hyporheic Exchange and Temperature Gradients Within Chinook Salmon Spawning Habitat written by Timothy Patrick Hanrahan and published by . This book was released on 2006 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Snake River Basin 2018 2019 written by Eric J. Stark and published by . This book was released on 2021 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt: Steelhead trout Oncorhynchus mykiss in the Snake River basin are the focus of a variety of harvest and conservation programs. A run reconstruction model offers a systematic way to address information needs for management within the large and complex arena presented by Snake River steelhead. The purpose of this work is to summarize data describing the abundance of steelhead crossing Lower Granite Dam (LGR), the spatial distribution of spawning fish, and known fates/disposition. To achieve this, a group of representatives from the anadromous fishery management agencies within the Snake River basin was convened in 2011. During the next year, the analytical framework was developed, and in late 2012 the first model run was completed on spawn year 2011. Since then, the workgroup has completed steelhead run reconstruction analyses on eight spawn years (2012-2018), each time making incremental improvements in the model. In this report our objective was to estimate the disposition of steelhead within the Snake River basin for the 2018-2019 return (spawn year 2019). After adjusting for nighttime passage and fallback, we estimated 8,309 wild steelhead, 3,698 unmarked hatchery steelhead, and 41,104 adipose-clipped hatchery steelhead passed LGR on the Snake River during spawn year 2019 (July 1, 2018 to June 30, 2019). Fishery-related steelhead mortality in the Snake River basin upstream of Ice Harbor Dam (ICH) totaled 513 wild steelhead, 398 unmarked hatchery fish, and 26,680 marked hatchery fish. Further, 32 wild fish, 425 unclipped hatchery fish, and 7,391 clipped hatchery fish; were collected for broodstock, culled, or donated to food banks (only hatchery fish). Potential spawners remaining in the habitat totaled 8,209 wild steelhead, 2,907 unclipped hatchery fish, and 10,061 clipped hatchery steelhead. Snake River wild steelhead stocks experienced total losses of 29.1% between Bonneville Dam and Ice Harbor Dam. Fishery-related losses across all Major Population Groups (MPGs) of wild steelhead within the Snake River basin was 5.3%. Using the run reconstruction model, we attempted to quantify the fishery-related impacts on both hatchery and wild steelhead as they migrate to their natal or release area. This work provides a useful framework for synthesizing data collected by fisheries managers that allows inferences regarding disposition and spatial distribution of spawning fish. Model results can be used by hatchery programs to evaluate their mitigation goals. And recently, results are also being utilized by NOAA to evaluate fishery impacts on wild steelhead as a requirement of Snake River managers permitted to conduct fisheries. The run reconstruction process is a good arena for critical review of the data that managers in the basin use. The model provides an analytical tool whose outputs can be used to bridge gaps in the existing data using reasonable assumptions in a structured manner. Model results will help evaluate the performance of the Snake River wild steelhead Distinct Population Segment (DPS) as part of the status review (Appendix A), as well as evaluate hatchery program performance in context of management goals.
Download or read book Restoration of Aquatic Ecosystems written by National Research Council and published by National Academies Press. This book was released on 1992-01-01 with total page 580 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aldo Leopold, father of the "land ethic," once said, "The time has come for science to busy itself with the earth itself. The first step is to reconstruct a sample of what we had to begin with." The concept he expressedâ€"restorationâ€"is defined in this comprehensive new volume that examines the prospects for repairing the damage society has done to the nation's aquatic resources: lakes, rivers and streams, and wetlands. Restoration of Aquatic Ecosystems outlines a national strategy for aquatic restoration, with practical recommendations, and features case studies of aquatic restoration activities around the country. The committee examines: Key concepts and techniques used in restoration. Common factors in successful restoration efforts. Threats to the health of the nation's aquatic ecosystems. Approaches to evaluation before, during, and after a restoration project. The emerging specialties of restoration and landscape ecology.
Download or read book Recovery Plan for the Sacramento San Joaquin Delta Native Fishes written by and published by . This book was released on 1996 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Snake River Basin 2017 2018 written by Eric J. Stark and published by . This book was released on 2019 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Using Network Models to Predict Steelhead Abundance Middle Fork John Day Or written by Monica R. Blanchard and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In the management of threatened and endangered species, informed population estimates are essential to gage whether or not recovery goals are being met. In the case of Pacific salmonids, this evaluation often involves sampling a small subset of the population and scaling up to estimate larger distinct populations segments. This is made complicated by the fact that fish populations are not evenly distributed along riverscapes but respond to physical and biological stream properties at varying spatial extents. We used rapid assessment survey methods and the River Styles classification to explore fish-habitat relationships at a continuous network scale. Semi-continuous surveys were conducted across nine streams in the upper Middle Fork John Day River watershed and increased the number of sites surveyed eight-fold over other monitoring methods within the watershed. Using this increased sample size and continuous habitat metrics we improved watershed-wide steelhead (Oncorhynchus mykiss) abundance models. We first validated the distinctions among River Styles through a classification analysis using physical metrics measured at the rapid assessment sites. Overall classification accuracy, using a combination of reach and landscape scale metrics, was 88.3% and suggested that River Style classification was identifying variations in physical morphology within the watershed that was quantifiable at the reach scale. Leveraging the continuous River Styles classification of physical habitat and a continuous model of primary production improved the prediction of steelhead abundance across the network. Using random forest regressions, a model that included only habitat metrics resulted in R2 = 0.34, while using the continuous variables improved the model accuracy greatly to R2 = 0.65. Random forest allowed for further investigation into the predictor variables through the analysis of the partial dependence plots and identified a gross primary production threshold, below which production might be limiting steelhead populations. This method also identified the rarest River Style surveyed within the watershed, Confined-Valley Step Cascade, as the morphology that had the largest marginal effect on steelhead. The inherent physical properties and boundary conditions unique to each River Style has the potential to inform fish-habitat relationships across riverscapes and improve abundance estimates on a continuous spatial scale.
Download or read book Snake River Basin 2019 2020 written by Lytle Denny and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Steelhead trout Oncorhynchus mykiss in the Snake River basin are the focus of a variety of harvest and conservation programs. Information needs for management of Snake River steelhead within this large and complex arena can be systematically addressed using a run reconstruction model. The purpose of this work is to summarize data describing the abundance of steelhead crossing Lower Granite Dam (LGR) and estimate the fishery-related impacts on both hatchery and wild steelhead as they migrate to their natal or release area in the Snake River basin. The model provides an analytical tool whose outputs can be used to bridge gaps in the existing data using reasonable assumptions in a structured manner. Representatives from the anadromous fishery management agencies within the Snake River basin collaborate to complete a run reconstruction for Snake River steelhead, which have been modeled since 2011. In this report our objective was to estimate the disposition of steelhead within the Snake River basin from July 1, 2019 to June 30, 2020 (spawn year 2020). After adjusting for nighttime passage and fallback, we estimated 9,771 wild steelhead, 2,449 unmarked hatchery steelhead, and 23,646 adipose-clipped hatchery steelhead passed LGR on the Snake River during spawn year 2020. Fishery-related steelhead mortality in the Snake River basin upstream of Ice Harbor Dam totaled 390 wild, 197 unmarked hatchery, and 8,864 marked hatchery fish. An additional 158 wild, 426 unclipped hatchery, and 7,069 clipped hatchery fish were collected for broodstock, culled, or donated to food banks (only hatchery fish). Snake River wild steelhead stocks experienced total losses of 21.8% between Bonneville Dam and Ice Harbor Dam. Fishery-related losses across all Major Population Groups of wild steelhead within the Snake River basin was 3.5%. Model results will allow Snake River basin managers to evaluate fishery impacts on wild steelhead, evaluate hatchery program performance, and help evaluate the performance of the Snake River steelhead evolutionarily significant unit.
Download or read book Biological Opinion that Address the Potential Effects on Sacramento River Winter run Chinook Salmon from the Bureau of Reclamation s Proposed Los Vaqueros Project written by and published by . This book was released on 1993 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
