Download or read book Analytical Approaches to Assessing Recovery Options for Snake River Chinook Salmon written by Phaedra Budy and published by . This book was released on 2001 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analytical Approaches to Assessing Recovery Options for Snake River Chinook Salmon written by Phaedra Budy and published by Createspace Independent Pub. This book was released on 2012-08-23 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: The depressed status of Snake River stocks of chinook and steelhead and the recent listings of many salmon stocks in the Columbia Basin have led to several analytical evaluations and management advice aimed at recovery of these stocks. These different analytical reviews address the effectiveness of different hydrosystem options as well as the potential for recovery through improvements that increase survival at other life stages (e.g., habitat, harvest). Hydrosystem options evaluated included status quo, maximizing transportation, and the option of breaching the lower four dams on the Snake River (also called drawdown and natural river options), the main topic of the Lower Snake River Juvenile Salmon Migration Feasibility Report / Environmental Impact Statement (USACE). The first review was completed by PATH (Plan for Testing and Analyzing Hypotheses), an open forum composed of modelers, fishery biologists and statisticians from all three states (Oregon, Washington, and Idaho), the federal government (Army Corps of Engineers (USACE), US Fish and Wildlife Service (USFWS), National Marine Fishery Service (NMFS), Bonneville Power Administration (BPA), the treaty tribes of the Columbia Basin (represented by the Columbia River Inter-tribal Fish Commission -CRITFC), and the Northwest Power Planning Council (NPPC). The PATH approach was based on a decision analysis that showed which management actions are the most robust to remaining uncertainties (i.e. the least risky) and allows a decision to be made with full consideration of uncertainty and risk. PATH analyses were followed by the NMFS effort called CRI- the Cumulative Risk Initiative. CRI analyses explore the demographic effects of hypothetical reductions in mortality at different life stages based on current conditions. PATH and CRI analyses were followed by an analytical comparison of their approaches and results completed by a sub group of PATH composed of scientists from the states of Oregon, Idaho, Washington, CRITFC, and the USFWS. In addition, specific analyses have considered the potential for improvement at certain life stages (e.g., freshwater spawning and rearing; Petrosky et al., in press) and key uncertainties that affect the likely effectiveness of dam breach (e.g., delayed hydrosystem mortality; Budy et al., in review). This annex synthesizes analyses and results PATH, NMFS CRI, and comparative and follow-up analyses which have been completed since and are summarized here and described in greater detail elsewhere. Although the results vary somewhat among approaches, all available science appears to suggest that dam breach has the greatest biological potential for recovering Snake River salmon and steelhead.
Download or read book An Assessment of Lower Snake River Hydrosystem Alternatives on Survival and Recovery of Snake River Salmonids Appendix to the U S Army Corps of Engineers Lower Snake River Juvenile Salmonid Migration Feasibility Study written by Northwest Fisheries Science Center (U.S.) and published by DIANE Publishing. This book was released on 2001 with total page 181 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cost effectiveness Analysis for Endangered and Threatened Snake River Salmon Recovery Planning written by Brian E. Garber-Yonts and published by . This book was released on 1996 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis addresses the costs of implementation of the Endangered Species Act (ESA) in the particular case of Snake River chinook salmon. Unlike most previous listings under the act, restoration of Snake River salmon will have impacts on a very broad array of industries and user groups over a region that spans several states and crosses international boundaries. It is indeed projected that the potential economic effects of salmon recovery will outweigh those of every other species listing under the ESA put together. While the case of Snake River salmon may not be entirely representative of ESA listings in general, it is an important test case for economic analysis of species recovery. What is particularly notable about the ESA is the unequivocalness of its mandate: take no action that further threatens an identified species, and take all action necessary to restore the population to a level at which its survival is assured. Upon implementation, however, it becomes immediately obvious that absolute certainty is unattainable, at any cost, and that resources for restoration are indeed limited. Thus arises the question of how to balance cost against risk of extinction. While the explicit balancing of costs and benefits of species recovery is (at least presently) essentially forbidden under the Act, the increasing marginal cost of further increments of risk reduction makes the consideration of the economics of species recovery unavoidable. The approach taken in this thesis is to define a cost effectiveness frontier which identifies the least cost recovery alternatives for each incremental decrease in risk of extinction, i.e define cost as a function of probability of survival. Monte-carlo simulations using a set of salmon life-cycle models are employed to assess the probability of survival achievable under a broad range of recovery alternatives. Alternatives range from elimination of sport and commercial harvest of Snake River chinook, alternative operation of hydropower facilities in the Snake and Columbia Basins, including removal of one or more dams on the Snake River, increased barge transportation of outmigrating juvenile salmon, improvement in upstream passage and spawning habitat, and a number of others. The alternatives considered span a range of costs and degrees of political acceptability. Cost assessments are largely gathered from ongoing federal and state planning analyses and include both direct and indirect costs of implementation. In addition to the level of costs under each alternative, this analysis also addresses the distribution of economic impacts across different user groups in the Columbia and Snake River Basin.
Download or read book An Analysis of Differential Delayed Mortality Experienced by Stream Type Chinook Salmon of the Snake River written by Nick Bouwes and published by Createspace Independent Pub. This book was released on 2012-08-23 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mass transportation of juvenile fish in the lower Snake River was initiated in the late 1970's in an effort to reduce mortality of salmon and steelhead during downstream migration. Fish are transported in barges and trucks to below BON, thereby circumventing direct mortality due to passage through the hydroelectric projects and reservoirs. Measurement of the efficacy of smolt transportation has taken the form of studies of “T/C” (transport/control) ratios. These mark recapture studies measured the smolt-to-adult return rates (SARs) of test fish, which were transported, and control fish which were returned to the river. These studies estimated the relative effectiveness of transportation to improve survival rates of fish from the site where they were collected as juveniles back to (usually) the same site when they returned as adults. Included in this T/C ratio is any differential mortality from the collection point to the end of the hydrosystem (to BON tailrace), as well as any differential mortality from below BON to the adult recapture site(s). Although fish generally appear to survive reasonably well while in the trucks and barges, it is harder to gauge how well transported fish survive below BON, after they are released and continue their life cycle in the estuary and ocean. NMFS suggests there may be partial support for delaying a decision to breach the lower Snake River hydroelectric dams because 'D' estimates, using “improved methods provided by PIT-tag technology”, appears to be high for the recent past (A-Fish). Based on these estimates, NMFS further suggest that “ongoing experiments by NMFS are likely to resolve the uncertainty regarding differential delayed transportation mortality in 5 to 10 years.” Alternatively, the Plan for Analyzing and Testing Hypotheses (PATH) analyses include a larger set of T/C studies and stock recruitment data that suggests 'D' is low, which lends support to breaching of the four Snake River dams as the most robust hydro action for recovery of Snake River salmon and steelhead (Marmorek et al. 1998). In this paper, we evaluate the NMFS conclusion that 'D' is now much higher than previously thought (A-Fish), demonstrate the sensitivity of estimates of 'D' to the numerous assumptions required to make an estimate of 'D', clarify and discuss the evidence for and against various interpretations of these assumptions, and discuss the possibility of improving estimates of 'D' in the future. We note that 'D' is not a measurement. Instead, it is an indirect estimate from data and requires numerous assumptions, with many different possible interpretations. In our analysis we evaluate the effect of these different assumptions on 'D' estimates: 1) including and excluding different control and transport groups; 2) using different techniques to expand reach survival rate estimates from a shorter experimental reach to the entire migration corridor; 3) using different approaches to weight cohort reach survival rate estimates to produce seasonal estimates; 4) using different approaches to summarize experimental groups on a daily or on a weekly basis for wild fish only or wild and hatchery fish combined; and finally 5) using different approaches of pooling or averaging estimates across years. In addition, the effects of using alternative tools (passage models) to estimate reach survival rates on 'D' value estimates were evaluated.
Download or read book Fish and Wildlife Implementation Plan written by and published by . This book was released on 2003 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chinook Analytical Framework written by and published by . This book was released on 1992 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analysis of Rebuilding Options for Snake River Spring Chinook Salmon written by Willis E. McConnaha and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Quantification of the Probable Effects of Alternative In River Harvest Regulations on Recovery of Snake River Fall Chinook Salmon written by and published by . This book was released on 1996 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of this study was to quantify the probable effects that alternative strategies for managing in-river harvest would have on recovery of Snake River fall chinook salmon. This report presents the analysis of existing data to quantify the way in which various in-river harvest strategies catch Snake River bright (SRB) fall chinook. Because there has been disagreement among experts regarding the magnitude of in-river harvest impacts on Snake River fall chinook, the authors compared the results from using the following three different methods to estimate in-river harvest rates: (1) use of run reconstruction through stock accounting of escapement and landings data to estimate harvest rate of SRB chinook in Zone 6 alone; (2) use of Coded Wire Tag (CWT) recoveries of fall chinook from Lyons Ferry Hatchery in a cohort analysis to estimate age and sex specific harvest rates for Zone 6 and for below Bonneville Dam; (3) comparison of harvest rates estimated for SRB chinook by the above methods to those estimated by the same methods for Upriver Bright (URB) fall chinook.
Download or read book Recovery Planning for Endangered Salmon written by and published by . This book was released on 1993 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: This analysis addresses multiple dimensions or attributes of recovery planning for endangered Snake River chinook stocks. The authors present a range of biological, economic, and social attributes for a number of recovery actions, and discuss aspects of the recovery actions that relate to each attribute. The emphasis on multiple attributes rather than on narrower biological measures alone reflects their belief that biological issues are only one of several sets of concerns that warrant attention in developing a recovery plan. Furthermore, the authors focus on both qualitative and quantitative factors because a lack of numerical information on certain attributes and recovery actions does not justify ignoring the non-numerical attributes or actions. After introducing the approach and providing the background, they define the attributes. An overview is provided of the biological modeling embedded in the analysis. The model used, the Stochastic Life Cycle Model (SLCM), determines the survival changes (relative to a base case) necessary to meet several biological criteria. These criteria reflect both the likelihood of population extinction and the projected population abundance 100 years into the future, relative to the initial abundance. The recovery options are outlined. The passage and harvest actions are characterized across the attributes is provided. The report assesses the life-stage survival improvements deemed necessary to avoid extinction and comments on the likelihood of meeting these improvements with the proposed actions. A cost-effectiveness analysis of the recovery strategies is provided.
Download or read book Analytical Methods for Determining Requirements of Listed Snake River Salmon Relative to Survival and Recovery written by and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analytical Methods for Determining Requirements of Listed Snake River Salmon Relative to Survival and Recovery written by and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Strategies for Recovery of Snake River Salmon written by and published by . This book was released on 1990 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Snake River Salmon Recovery written by United States. Congress. Senate. Committee on Appropriations. Subcommittee on Energy and Water Development and published by . This book was released on 1995 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Columbia River Basin Salmon and Steelhead Long term Recovery Situation Assessment written by and published by . This book was released on 2014 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: "In the fall of 2012, after consulting with a wide range of salmon recovery partners, NOAA Fisheries asked Oregon Consensus and the William D. Ruckelshaus Center (university-based, neutral, third-party institutions devoted to promoting collaborative governance and consensus-based public policy) to conduct an independent, impartial situation assessment to explore regional views about how best to approach comprehensive, long-term salmon and steelhead recovery in the Basin. The centers assembled an Assessment Team comprised of practitioners and academics from Washington, Oregon and Idaho. The Assessment Team conducted 206 semi-structured interviews with individuals selected for their knowledge of, engagement in, and/or concern for salmon recovery planning in the Basin. The overall goal of the assessment and this report is to provide a summary of key themes, issues and perspectives identified from the interviews, and to describe potential process options to better achieve desired outcomes regarding longterm salmon and steelhead recovery in the Basin. This report begins with an explanation of the assessment process, followed by a brief overview of recovery processes in the Basin. The report then presents a synthesis of information gained through the interviews, focusing on key themes. The last section presents a conceptual framework for assessing the salmon recovery system, along with key findings and process options for improving the system and addressing salmon and steelhead recovery in the long term. Supplemental information is provided in appendices."--Executive summary (page 1).
Download or read book Salmon Decision Analysis Lower Snake River Feasibility Study written by and published by . This book was released on 1996 with total page 295 pages. Available in PDF, EPUB and Kindle. Book excerpt: The National Marine Fishery Service (NMFS) 1995 Biological Opinion provides an Interim Plan to recover chinook salmon in the Snake River. It calls for increased spill and flows past the four lower Snake hydroelectric dams. The Plan directs the Corps to analyze additional measures including reservoir drawdowns and surface collectors. NMFS requested guidance on the specific design and testing of drawdowns and surface collectors. The purpose of this report is to lay out the options for improving the hydropower system to help save salmon. There are only three options or paths available. Our goal is to provide biological criteria for each path, estimate how much it might help salmon, how long it will take, and how much it might cost. We will also compare hydropower improvements with other factors affecting recovery. Along with surface collectors and drawdowns, we identify 15 major actions (tools) that can be implemented for salmon under three different strategies we call paths.
Download or read book Report to the Snake River Salmon Recovery Team on an Analysis of Spring and Fall Chinook Survivals Using the CRiSP Mainstem Passage Model written by James Anderson and published by . This book was released on 1993 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
